Prof. Dr. Franz Bartl
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SFB 1078/2: Spektroskopische Untersuchungen von Protonentransferprozessen und wasserstoffgebundenen Netzwerken in Channelrhodopsinen und Phytochromen (TP B05)
Quelle ↗Förderer: DFG Sonderforschungsbereich Zeitraum: 04/2017 - 12/2020 Projektleitung: Prof. Dr. Franz Bartl
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Publikationen25
Top 25 nach Zitationen — Quelle: OpenAlex (BAAI/bge-m3 embedded für Matching).
Journal of Biological Chemistry · 191 Zitationen · DOI
Channelrhodopsin-2 (ChR2) is a microbial type rhodopsin and a light-gated cation channel that controls phototaxis in Chlamydomonas. We expressed ChR2 in COS-cells, purified it, and subsequently investigated this unusual photoreceptor by flash photolysis and UV-visible and Fourier transform infrared difference spectroscopy. Several transient photoproducts of the wild type ChR2 were identified, and their kinetics and molecular properties were compared with those of the ChR2 mutant E90Q. Based on the spectroscopic data we developed a model of the photocycle comprising six distinguishable intermediates. This photocycle shows similarities to the photocycle of the ChR2-related Channelrhodopsin of Volvox but also displays significant differences. We show that molecular changes include retinal isomerization, changes in hydrogen bonding of carboxylic acids, and large alterations of the protein backbone structure. These alterations are stronger than those observed in the photocycle of other microbial rhodopsins like bacteriorhodopsin and are related to those occurring in animal rhodopsins. UV-visible and Fourier transform infrared difference spectroscopy revealed two late intermediates with different time constants of tau = 6 and 40 s that exist during the recovery of the dark state. The carboxylic side chain of Glu(90) is involved in the slow transition. The molecular changes during the ChR2 photocycle are discussed with respect to other members of the rhodopsin family.
Nature Communications · 163 Zitationen · DOI
G-protein-coupled receptors (GPCRs) transmit extracellular signals to activate intracellular heterotrimeric G proteins (Gαβγ) and arrestins. For G protein signalling, the Gα C-terminus (GαCT) binds to a cytoplasmic crevice of the receptor that opens upon activation. A consensus motif is shared among GαCT from the Gi/Gt family and the 'finger loop' region (ArrFL1-4) of all four arrestins. Here we present a 2.75 Å crystal structure of ArrFL-1, a peptide analogue of the finger loop of rod photoreceptor arrestin, in complex with the prototypical GPCR rhodopsin. Functional binding of ArrFL to the receptor was confirmed by ultraviolet-visible absorption spectroscopy, competitive binding assays and Fourier transform infrared spectroscopy. For both GαCT and ArrFL, binding to the receptor crevice induces a similar reverse turn structure, although significant structural differences are seen at the rim of the binding crevice. Our results reflect both the common receptor-binding interface and the divergent biological functions of G proteins and arrestins.
Journal of Natural Products · 109 Zitationen · DOI
Hassallidin A (1), a new antifungal glycosylated lipopeptide, was isolated from an epilithic cyanobacterium collected in Bellano, Italy, identified as Tolypothrix (basionym Hassallia) species. Chemical, mass spectrometric, and spectroscopic analyses, including one- and two-dimensional NMR, were performed to determine an esterified eight-residue cyclic peptide linked with a carbohydrate and a fatty acid residue. Chiral GC-MS analysis revealed the occurrence of the nonproteinogenic amino acids D-allo-Thr, D-Thr, D-Tyr, D-Gln, and dehydroaminobutyric acid (Dhb) within the peptide moiety. The additional components of hassallidin A could be identified as alpha,beta-dihydroxytetradecanoic acid (Dht) and mannose. This is the first report on a cyclic peptide of cyanobacterial origin that contains both a fatty acid and a carbohydrate moiety. Compound 1 exhibits antifungal activity against Aspergillus fumigatus and Candida albicans with MIC values of 4.8 microg/mL for both test organisms.
Journal of Biological Chemistry · 107 Zitationen · DOI
Vertebrate rhodopsin consists of the apoprotein opsin and the chromophore 11-cis-retinal covalently linked via a protonated Schiff base. Upon photoisomerization of the chromophore to all-trans-retinal, the retinylidene linkage hydrolyzes, and all-trans-retinal dissociates from opsin. The pigment is eventually restored by recombining with enzymatically produced 11-cis-retinal. All-trans-retinal release occurs in parallel with decay of the active form, metarhodopsin (Meta) II, in which the original Schiff base is intact but deprotonated. The intermediates formed during Meta II decay include Meta III, with the original Schiff base reprotonated, and Meta III-like pseudo-photoproducts. Using an intrinsic fluorescence assay, Fourier transform infrared spectroscopy, and UV-visible spectroscopy, we investigated Meta II decay in native rod disk membranes. Up to 40% of Meta III is formed without changes in the intrinsic Trp fluorescence and thus without all-trans-retinal release. NADPH, a cofactor for the reduction of all-trans-retinal to all-trans-retinol, does not accelerate Meta II decay nor does it change the amount of Meta III formed. However, Meta III can be photoconverted back to the Meta II signaling state. The data are described by two quasi-irreversible pathways, leading in parallel into Meta III or into release of all-trans-retinal. Therefore, Meta III could be a form of rhodopsin that is stored away, thus regulating photoreceptor regeneration.
Nature Chemistry · 97 Zitationen · DOI
Journal of Biological Chemistry · 88 Zitationen · DOI
The light-activated microbial ion channel channelrhodopsin-2 (ChR2) is a powerful tool to study cellular processes with high spatiotemporal resolution in the emerging field of optogenetics. To customize the channel properties for optogenetic experiments, a detailed understanding of its molecular reaction mechanism is essential. Here, Glu-90, a key residue involved in the gating and selectivity mechanism of the ion channel is characterized in detail. The deprotonation of Glu-90 during the photocycle is elucidated by time-resolved FTIR spectroscopy, which seems to be part of the opening mechanism of the conductive pore. Furthermore, Glu-90 is crucial to ion selectivity as also revealed by mutation of this residue combined with voltage clamp experiments. By dynamic homology modeling, we further hypothesized that the conductive pore is flanked by Glu-90 and located between helices A, B, C, and G.
Angewandte Chemie International Edition · 84 Zitationen · DOI
Channelrhodopsins (ChRs) are light-gated ion channels that are widely used in optogenetics. They allow precise control of neuronal activity with light, but a detailed understanding of how the channel is gated and the ions are conducted is still lacking. The recent determination of the X-ray structural model in the closed state marks an important milestone. Herein the open state structure is presented and the early formation of the ion conducting pore is elucidated in atomic detail using time-resolved FTIR spectroscopy. Photo-isomerization of the retinal-chromophore causes a downward movement of the highly conserved E90, which opens the pore. Molecular dynamic (MD) simulations show that water molecules invade through this opened pore, Helix 2 tilts and the channel fully opens within ms. Since E90 is a highly conserved residue, the proposed E90-Helix2-tilt (EHT) model might describe a general activation mechanism and provides a new avenue for further mechanistic studies and engineering.
Journal of Biological Chemistry · 74 Zitationen · DOI
Phytochromes act as photoswitches between the red- and far-red absorbing parent states of phytochromes (Pr and Pfr). Plant phytochromes display an additional thermal conversion route from the physiologically active Pfr to Pr. The same reaction pattern is found in prototypical biliverdin-binding bacteriophytochromes in contrast to the reverse thermal transformation in bathy bacteriophytochromes. However, the molecular origin of the different thermal stabilities of the Pfr states in prototypical and bathy bacteriophytochromes is not known. We analyzed the structures of the chromophore binding pockets in the Pfr states of various bathy and prototypical biliverdin-binding phytochromes using a combined spectroscopic-theoretical approach. For the Pfr state of the bathy phytochrome from Pseudomonas aeruginosa, the very good agreement between calculated and experimental Raman spectra of the biliverdin cofactor is in line with important conclusions of previous crystallographic analyses, particularly the ZZEssa configuration of the chromophore and its mode of covalent attachment to the protein. The highly homogeneous chromophore conformation seems to be a unique property of the Pfr states of bathy phytochromes. This is in sharp contrast to the Pfr states of prototypical phytochromes that display conformational equilibria between two sub-states exhibiting small structural differences at the terminal methine bridges A-B and C-D. These differences may mainly root in the interactions of the cofactor with the highly conserved Asp-194 that occur via its carboxylate function in bathy phytochromes. The weaker interactions via the carbonyl function in prototypical phytochromes may lead to a higher structural flexibility of the chromophore pocket opening a reaction channel for the thermal (ZZE → ZZZ) Pfr to Pr back-conversion.
Nature Communications · 71 Zitationen · DOI
Channelrhodopsins (ChRs) are algal light-gated ion channels widely used as optogenetic tools for manipulating neuronal activity. ChRs desensitize under continuous bright-light illumination, resulting in a significant decline of photocurrents. Here we describe a metagenomically identified family of phylogenetically distinct anion-conducting ChRs (designated MerMAIDs). MerMAIDs almost completely desensitize during continuous illumination due to accumulation of a late non-conducting photointermediate that disrupts the ion permeation pathway. MerMAID desensitization can be fully explained by a single photocycle in which a long-lived desensitized state follows the short-lived conducting state. A conserved cysteine is the critical factor in desensitization, as its mutation results in recovery of large stationary photocurrents. The rapid desensitization of MerMAIDs enables their use as optogenetic silencers for transient suppression of individual action potentials without affecting subsequent spiking during continuous illumination. Our results could facilitate the development of optogenetic tools from metagenomic databases and enhance general understanding of ChR function.
Journal of Molecular Biology · 70 Zitationen · DOI
Review of Scientific Instruments · 67 Zitationen · DOI
At BESSY a multipurpose infrared (IR) beamline is being built for biological and materials science investigations. It will provide useful IR intensities over the energy range from about 10 000 down to 50 cm−1 and lower. After commissioning the first beamline section in the spring of this year first quantitative measurements on the performance have been made in the near and mid-infrared wavelength region.
Current Organic Chemistry · 63 Zitationen · DOI
In many cases, the cofactors of biologically important proteins are linked to their apoproteins by Schiff bases. In this review we discuss three classes of proteins in which Schiff bases are crucial for their function and catalytic mechanisms. First, we focus on retinylidene proteins, in which the cofactor retinal is fixed to the apoprotein by a protonated Schiff base. Light induced retinal isomerization triggers a photocycle or a cascade of structural changes in which deprotonation of the Schiff base is a crucial step. We compare the photocycles of archaeal type rhodopsins, channelrhodopsins and the light induced cascades of visual rhodopsins. Pyridoxal phosphate (PLP) dependent enzymes are summarized in the second section. In these proteins, the cofactor PLP is linked via a Schiff base to the side chain of a lysine. In most cases, hydrolysis of this linkage is critical for substrate binding. Finally, aldolases, that catalyze aldol cleavage during glycolysis, contain a lysine residue at their active center. Formation of a protonated Schiff base linkage to a carbonyl group of the substrate is the first step of the catalytic mechanism. This will be discussed in the last section.
Bioorganic & Medicinal Chemistry Letters · 55 Zitationen · DOI
Journal of Biological Chemistry · 52 Zitationen · DOI
Absorption of light in rhodopsin leads through 11-cis- and all-trans-retinal isomerization, proton transfers, and structural changes to the active G-protein binding meta-II state. When meta-II is photolysed by blue light absorption, the activating pathway is apparently reverted, and rhodopsin is photoregenerated. However, the product formed, a P subspecies with A(max) = 500 nm (P(500)), is different from the ground state based on the following observations: (i) the ground state fingerprint of 11-cis-retinal does not appear in the infrared spectra, although the proton transfers and structural changes are reverted; (ii) extraction of the retinal from P(500) does not yield the expected stoichiometric amount of 11-cis-retinal but predominantly yields all-trans-retinal; (iii) the infrared spectrum of P(500) is similar to the classical meta-III intermediate, which arises from meta-II by thermal decay; and (iv) both P(500) and meta-III can be photoconverted to meta-II with the same changes in the infrared spectrum and without a significant change in the isomerization state of the extracted chromophore. The data indicate the presence of a "second switch" between active and inactive conformations that operates by photolysis but without isomerization around the C(11)-C(12) double bond. This emphasizes the exclusivity of the ground state, which is only accessible by the metabolic regeneration with 11-cis-retinal.
Journal of Molecular Structure · 51 Zitationen · DOI
Journal of Biological Chemistry · 49 Zitationen · DOI
Channelrhodopsins are microbial type rhodopsins that operate as light-gated ion channels. Largely prolonged lifetimes of the conducting state of channelrhodopsin-2 may be achieved by mutations of crucial single amino acids, i.e. cysteine 128. Such mutants are of great scientific interest in the field of neurophysiology because they allow neurons to be switched on and off on demand (step function rhodopsins). Due to their slow photocycle, structural alterations of these proteins can be studied by vibrational spectroscopy in more detail than possible with wild type. Here, we present spectroscopic evidence that the photocycle of the C128T mutant involves three different dark-adapted states that are populated according to the wavelength and duration of the preceding illumination. Our results suggest an important role of multiphoton reactions and the previously described side reaction for dark state regeneration. Structural changes that cause formation and depletion of the assumed ion conducting state P520 are only small and follow larger changes that occur early and late in the photocycle, respectively. They require only minor structural rearrangements of amino acids near the retinal binding pocket and are triggered by all-trans/13-cis retinal isomerization, although additional isomerizations are also involved in the photocycle. We will discuss an extended photocycle model of this mutant on the basis of spectroscopic and electrophysiological data.
Journal of the American Chemical Society · 48 Zitationen · DOI
The G protein coupled receptor (GPCR) rhodopsin activates the heterotrimeric G protein transducin (Gt) to transmit the light signal into retinal rod cells. The rhodopsin activity is virtually zero in the dark and jumps by more than one billion fold after photon capture. Such perfect switching implies both high fidelity and speed of rhodopsin/Gt coupling. We employed Fourier transform infrared (FTIR) spectroscopy and supporting all-atom molecular dynamics (MD) simulations to study the conformational diversity of rhodopsin in membrane environment and extend the static picture provided by the available crystal structures. The FTIR results show how the equilibria of inactive and active protein states of the receptor (so-called metarhodopsin states) are regulated by the highly conserved E(D)RY and Yx7K(R) motives. The MD data identify an intrinsically unstructured cytoplasmic loop region connecting transmembrane helices 5 and 6 (CL3) and show how each protein state is split into conformational substates. The C-termini of the Gtγ- and Gtα-subunits (GαCT and GγCT), prepared as synthetic peptides, are likely to bind sequentially and at different sites of the active receptor. The peptides have different effects on the receptor conformation. While GγCT stabilizes the active states but preserves CL3 flexibility, GαCT selectively stabilizes a single conformational substate with largely helical CL3, as it is found in crystal structures. Based on these results we propose a mechanism for the fast and precise signal transfer from rhodopsin to Gt, which assumes a stepwise and mutual reduction of their conformational space. The mechanism relies on conserved amino acids and may therefore underlie GPCR/G protein coupling in general.
Journal of Biological Chemistry · 47 Zitationen · DOI
Rhodopsin bears 11-cis-retinal covalently bound by a protonated Schiff base linkage. 11-cis/all-trans isomerization, induced by absorption of green light, leads to active metarhodopsin II, in which the Schiff base is intact but deprotonated. The subsequent metabolic retinoid cycle starts with Schiff base hydrolysis and release of photolyzed all-trans-retinal from the active site and ends with the uptake of fresh 11-cis-retinal. To probe chromophore-protein interaction in the active state, we have studied the effects of blue light absorption on metarhodopsin II using infrared and time-resolved UV-visible spectroscopy. A light-induced shortcut of the retinoid cycle, as it occurs in other retinal proteins, is not observed. The predominantly formed illumination product contains all-trans-retinal, although the spectra reflect Schiff base reprotonation and protein deactivation. By its kinetics of formation and decay, its low temperature photointermediates, and its interaction with transducin, this illumination product is identified as metarhodopsin III. This species is known to bind all-trans-retinal via a reprotonated Schiff base and forms normally in parallel to retinal release. We find that its generation by light absorption is only achieved when starting from active metarhodopsin II and is not found with any of its precursors, including metarhodopsin I. Based on the finding of others that metarhodopsin III binds retinal in all-trans-C(15)-syn configuration, we can now conclude that light-induced formation of metarhodopsin III operates by Schiff base isomerization ("second switch"). Our reaction model assumes steric hindrance of the retinal polyene chain in the active conformation, thus preventing central double bond isomerization.
Biopolymers · 45 Zitationen · DOI
Three Schiff bases of racemic gossypol with polyoxaalkylamines were synthesized and studied by FTIR and (1)H-NMR spectroscopy, and their structures were calculated by the PM5 semiempirical method. These Schiff bases exist in the solid state and in solutions as enamine forms. An increasing length of the polyoxaalkyl chain causes the increase of the interaction of the oxygen atoms of this chain with the OH groups in the 6,6' positions. This interaction is very well evidenced in the FTIR and (1)H-NMR spectra. The structures of the Schiff bases and the hydrogen bonds within these structures are discussed.
Journal of Biological Chemistry · 45 Zitationen · DOI
The guanine nucleotide-binding protein (G-protein)-coupled receptor superfamily (GPCR) is comprised of a large group of membrane proteins involved in a wide range of physiological signaling processes. The functional switch from a quiescent to an active conformation is at the heart of GPCR action. The GPCR rhodopsin has been studied extensively because of its key role in scotopic vision. The ground state chromophore, 11-cis-retinal, holds the transmembrane region of the protein in the inactive conformation. Light induces cis-trans isomerization and rhodopsin activation. Here we show that rhodopsin regenerated with a ring-constrained 11-cis-retinal analog undergoes photoisomerization; however, it remains marginally active because isomerization occurs without the chromophore-induced conformational change of the opsin moiety. Modeling the locked chromophore analogs in the active site of rhodopsin suggests that the beta-ionone ring rotates but is largely confined within the binding site of the natural 11-cis-retinal chromophore. This constraint is a result of the geometry of the stable 11-cis-locked configuration of the chromophore analogs. These results suggest that the native chromophore cis-trans isomerization is merely a mechanism for repositioning of the beta-ionone ring which ultimately leads to helix movements and determines receptor activation.
The Journal of Physical Chemistry B · 45 Zitationen · DOI
Gramicidin A and C as well as their proton and Li+ complexes were studied by FT-IR spectroscopy. With an increasing number of hydrated and protonated channels, infrared continuous absorption is observed. It proves large proton polarizability due to very fast collective fluctuations and shifts of the excess proton in hydrogen-bonded single file water chains in the gramicidin channels. The infrared spectrum of the hydrated Li+ cation in the channels shows a continuum in the far-infrared region. This continuum is explained in terms of Li+ ion fluctuations and shifts between the electron lone pairs of two water molecules and at least three carbonyl O atoms of the backbone. The continuum indicates large Li+ polarizability of these channels. If the Li+-bonded system is polarized by an external electrical field, the diffusion of the Li+−water complex in field direction is favored.
Journal of Biological Chemistry · 44 Zitationen · DOI
The visual process in rod cells is initiated by absorption of a photon in the rhodopsin retinal chromophore and consequent retinal cis/trans-isomerization. The ring structure of retinal is thought to be needed to transmit the photonic energy into conformational changes culminating in the active metarhodopsin II (Meta II) intermediate. Here, we demonstrate that cis-acyclic retinals, lacking four carbon atoms of the ring, can activate rhodopsin. Detailed analysis of the activation pathway showed that, although the photoproduct pathway is more complex, Meta II formed with almost normal kinetics. However, lack of the ring structure resulted in a low amount of Meta II and a fast decay of activity. We conclude that the main role of the ring structure is to maintain the active state, thus specifying a mechanism of activation by a partial agonist of the G protein-coupled receptor rhodopsin.
Physical Chemistry Chemical Physics · 43 Zitationen · DOI
The activation of rhodopsin has been the focus of researchers over the past decades, revealing many aspects of the activation pathways of this prototypical G protein-coupled receptor on a molecular level, starting with the light-dependent isomerization of its retinal chromophore from 11-cis to all-trans and leading eventually to the large scale helix movements in the transition to the active receptor state, Meta II. Comparatively little is known, however, on the deactivation pathways of the light receptor, which represent essential steps in maintaining a functional photoreceptor cell. Rhodopsin's active receptor species, Meta II, decays by two fundamentally different pathways, either forming the apoprotein opsin by release of the activating all-trans retinal ligand from its binding pocket, or by a thermal isomerization of this ligand to a less activating species in the transition to metarhodopsin III (Meta III). Both decay products, opsin and Meta III, are largely inactive under physiological conditions, yet they do not restore the complete inactivity of the dark state. Although some properties of Meta III have been described already in the 1960s, its molecular nature and the pathways of its formation have remained rather obscure. In this review, we focus on recent studies from our laboratories, which have provided a major progress in our understanding of the Meta III deactivation pathway and its potential physiological roles. Using Fourier-transform infrared (FTIR) difference spectroscopy in combination with a variety of other spectroscopic and biochemical techniques and quantum chemical calculations, we have developed a general picture of the interplay between the retinal ligand and the receptor protein, which is compared to similar reaction mechanisms in invertebrate photoreceptors and microbial retinal proteins.
Photochemistry and Photobiology · 42 Zitationen · DOI
Rhodopsin, the visual pigment of the rod photoreceptor cell contains as its light-sensitive cofactor 11-cis retinal, which is bound by a protonated Schiff base between its aldehyde group and the Lys296 side chain of the apoprotein. Light activation is achieved by 11-cis to all-trans isomerization and subsequent thermal relaxation into the active, G protein-binding metarhodopsin II state. Metarhodopsin II decays via two parallel pathways, which both involve hydrolysis of the Schiff base eventually to opsin and released all-trans retinal. Subsequently, rhodopsin's dark state is regenerated by a complicated retinal metabolism, termed the retinoid cycle. Unlike other retinal proteins, such as bacteriorhodopsin, this regeneration cycle cannot be short cut by light, because blue illumination of active metarhodopsin II does not lead back to the ground state but to the formation of largely inactive metarhodopsin III. In this review, mechanistic details of activating and deactivating pathways of rhodopsin, particularly concerning the roles of the retinal, are compared. Based on static and time-resolved UV/Vis and FTIR spectroscopic data, we discuss a model of the light-induced deactivation. We describe properties and photoreactions of metarhodopsin III and suggest potential roles of this intermediate for vision.
Journal of Molecular Structure · 42 Zitationen · DOI
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- Prof. Dr. Franz Bartl
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- Prof. Dr.
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- Lebenswissenschaftliche Fakultät
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- Institut für Biologie
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- Biophysikalische Chemie
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