Biochemistry, Biophysics & Structural Biology Department

Biochemistry, Biophysics and Structural Biology Department

Head: 

Julie Ménétrey

Deputy  heads:

    Benoit D’Autréaux 

Virginie Gervais 

From Atoms to Function : Decoding How Macromolecular Structures and Dynamics Orchestrate Life

Focus

The B3S teams study soluble and membrane protein assemblies involved in major biological processes of eukaryotic and bacterial cells. 

Our aim is to  understand the molecular mechanisms of biological structures and biochemical reactions at different scales, from electrons and protons via atoms and molecules to multicellular organisms. Successfully introduced new technologies to promote product innovation and upgrades.

Approaches

Biochemical reactions, interactions and enzymatic processes, including large conformational changes and rearrangements within proteins and their complexes, are often initiated by a transfer of subatomic particles – electrons and protons. Studying the atomic structures of proteins with and without ligands can for example help determine how the structure of the active site enables an enzyme to perform its activity.

At molecular scales, biochemical and biophysical analyses as well as structure determination of protein-protein, or protein-nucleic acid complexes, helps in describing the interaction of biological assemblies and understanding biochemical reactions.  In vitro reconstitution of cellular functions leads to an understanding of the regulation of complex processes in vivo.

Research groups

Publications

3888256 B3S 1 chicago-author-date 5 date desc year 36406 https://www.i2bc.paris-saclay.fr/wp-content/plugins/zotpress/
%7B%22status%22%3A%22success%22%2C%22updateneeded%22%3Afalse%2C%22instance%22%3Afalse%2C%22meta%22%3A%7B%22request_last%22%3A0%2C%22request_next%22%3A0%2C%22used_cache%22%3Atrue%7D%2C%22data%22%3A%5B%7B%22key%22%3A%22G9BYRPDS%22%2C%22library%22%3A%7B%22id%22%3A3888256%7D%2C%22meta%22%3A%7B%22creatorSummary%22%3A%22Bo%5Cu00ebffard-Dosierre%20et%20al.%22%2C%22parsedDate%22%3A%222026-12-31%22%2C%22numChildren%22%3A1%7D%2C%22bib%22%3A%22%26lt%3Bdiv%20class%3D%26quot%3Bcsl-bib-body%26quot%3B%20style%3D%26quot%3Bline-height%3A%201.35%3B%20padding-left%3A%201em%3B%20text-indent%3A-1em%3B%26quot%3B%26gt%3B%5Cn%20%20%26lt%3Bdiv%20class%3D%26quot%3Bcsl-entry%26quot%3B%26gt%3BBo%26%23xEB%3Bffard-Dosierre%2C%20Liza%2C%20Camille%20Dagallier%2C%20G%26%23xE9%3Braldine%20Eudier%2C%20et%20al.%202026.%20%26%23x201C%3BNMR%20Detects%20Clustering%20and%20Ultra-Weak%20Excipient%20Interactions%20Governing%20Monoclonal%20Antibody%20Viscosity%20in%20Formulation-Relevant%20Conditions.%26%23x201D%3B%20%26lt%3Bi%26gt%3BmAbs%26lt%3B%5C%2Fi%26gt%3B%2018%20%281%29%3A%202685366.%20%26lt%3Ba%20class%3D%26%23039%3Bzp-DOIURL%26%23039%3B%20href%3D%26%23039%3Bhttps%3A%5C%2F%5C%2Fdoi.org%5C%2F10.1080%5C%2F19420862.2026.2685366%26%23039%3B%26gt%3Bhttps%3A%5C%2F%5C%2Fdoi.org%5C%2F10.1080%5C%2F19420862.2026.2685366%26lt%3B%5C%2Fa%26gt%3B.%26lt%3B%5C%2Fdiv%26gt%3B%5Cn%26lt%3B%5C%2Fdiv%26gt%3B%22%2C%22data%22%3A%7B%22itemType%22%3A%22journalArticle%22%2C%22title%22%3A%22NMR%20detects%20clustering%20and%20ultra-weak%20excipient%20interactions%20governing%20monoclonal%20antibody%20viscosity%20in%20formulation-relevant%20conditions%22%2C%22creators%22%3A%5B%7B%22creatorType%22%3A%22author%22%2C%22firstName%22%3A%22Liza%22%2C%22lastName%22%3A%22Bo%5Cu00ebffard-Dosierre%22%7D%2C%7B%22creatorType%22%3A%22author%22%2C%22firstName%22%3A%22Camille%22%2C%22lastName%22%3A%22Dagallier%22%7D%2C%7B%22creatorType%22%3A%22author%22%2C%22firstName%22%3A%22G%5Cu00e9raldine%22%2C%22lastName%22%3A%22Eudier%22%7D%2C%7B%22creatorType%22%3A%22author%22%2C%22firstName%22%3A%22Vasco%22%2C%22lastName%22%3A%22Filipe%22%7D%2C%7B%22creatorType%22%3A%22author%22%2C%22firstName%22%3A%22Atifa%22%2C%22lastName%22%3A%22Badar-Majeed%22%7D%2C%7B%22creatorType%22%3A%22author%22%2C%22firstName%22%3A%22Sol%5Cu00e8ne%22%2C%22lastName%22%3A%22Fraumont%22%7D%2C%7B%22creatorType%22%3A%22author%22%2C%22firstName%22%3A%22Sophie%22%2C%22lastName%22%3A%22Zinn-Justin%22%7D%2C%7B%22creatorType%22%3A%22author%22%2C%22firstName%22%3A%22Francois-Xavier%22%2C%22lastName%22%3A%22Theillet%22%7D%5D%2C%22abstractNote%22%3A%22High-concentration%20formulations%20of%20monoclonal%20antibodies%20%28mAbs%29%20are%20required%20for%20subcutaneous%20administration%20but%20are%20frequently%20challenging%20to%20develop%20due%20to%20elevated%20viscosity%20and%20colloidal%20instability.%20These%20properties%20are%20governed%20by%20mAb-mAb%20interactions%20that%20are%20regulated%20by%20additional%20mAb-excipient%20interactions.%20These%20ultra-weak%20interactions%20remain%20difficult%20to%20characterize%20using%20conventional%20techniques.%20Here%2C%20we%20combined%20nuclear%20magnetic%20resonance%20%28NMR%29%20spectroscopy%20with%20rheometry%20and%20dynamic%20light%20scattering%20to%20investigate%20mAb%20interactions%20under%20formulation-relevant%20conditions.%20Rheological%20measurements%20showed%20that%2C%20in%20the%20case%20of%20the%20chosen%20mAb%2C%20the%20excipients%20arginine%20and%20lysine%20strongly%20reduce%20the%20macroscopic%20viscosity%2C%20whereas%20other%20excipients%20display%20a%20moderate%20effect%20by%20themselves.%20Characterization%20of%20the%20mAb%20oligomeric%20state%20by%201H%20NMR%20confirmed%20that%20arginine%20and%20lysine%20are%20the%20most%20efficient%20at%20reducing%20mAb%20self-assembly%2C%20while%20proline%20and%20glycine%20promote%20clustering.%20Interactions%20between%20mAb%20and%20excipients%20were%20first%20analyzed%20by%20measuring%20excipient%20diffusion%20coefficients%2C%20but%20these%20are%20only%20weakly%20affected%20by%20the%20addition%20of%20concentrated%20mAb.%20The%20mAb-excipient%20interactions%20were%20further%20detected%20by%20measuring%20excipient%201H%20and%2013C%20chemical%20shifts%2C%20mAb-excipient%20saturation%20transfers%2C%20and%20excipient%201H%20transverse%20relaxation%20rates.%20These%20experiments%20provided%20complementary%20information%20on%20excipient%20interactions%20with%20the%20different%20mAb%20oligomers.%20Lysine%20was%20identified%20as%20the%20best%20mAb%20binder.%20However%2C%20several%20excipients%20such%20as%20sucrose%20that%20do%20not%20reduce%20the%20macroscopic%20viscosity%20also%20bind%20to%20concentrated%20mAb%2C%20highlighting%20that%20excipient%20binding%20can%20have%20various%20consequences%20on%20the%20transient%20interactions%20between%20mAb%20species.%20Altogether%2C%20this%20work%20proposes%20a%20powerful%20NMR%20pipeline%20to%20dissect%20ultra-weak%20molecular%20interactions%20that%20govern%20viscosity%20and%20developability%20in%20therapeutic%20antibody%20formulations.%22%2C%22date%22%3A%222026-12-31%22%2C%22section%22%3A%22%22%2C%22partNumber%22%3A%22%22%2C%22partTitle%22%3A%22%22%2C%22DOI%22%3A%2210.1080%5C%2F19420862.2026.2685366%22%2C%22citationKey%22%3A%22%22%2C%22url%22%3A%22%22%2C%22PMID%22%3A%2242272436%22%2C%22PMCID%22%3A%22%22%2C%22ISSN%22%3A%221942-0870%22%2C%22language%22%3A%22eng%22%2C%22collections%22%3A%5B%5D%2C%22dateModified%22%3A%222026-06-12T07%3A26%3A39Z%22%7D%7D%2C%7B%22key%22%3A%22Q4DZ3WS5%22%2C%22library%22%3A%7B%22id%22%3A3888256%7D%2C%22meta%22%3A%7B%22creatorSummary%22%3A%22Elfarkouchi%20et%20al.%22%2C%22parsedDate%22%3A%222026-11-02%22%2C%22numChildren%22%3A1%7D%2C%22bib%22%3A%22%26lt%3Bdiv%20class%3D%26quot%3Bcsl-bib-body%26quot%3B%20style%3D%26quot%3Bline-height%3A%201.35%3B%20padding-left%3A%201em%3B%20text-indent%3A-1em%3B%26quot%3B%26gt%3B%5Cn%20%20%26lt%3Bdiv%20class%3D%26quot%3Bcsl-entry%26quot%3B%26gt%3BElfarkouchi%2C%20Abir%2C%20Arthur%20Vitard%2C%20L%26%23xE9%3Ba%20Mammri%2C%20et%20al.%202026.%20%26%23x201C%3BA%20Structural%20Model%20for%20the%20Autoinhibition%20of%20the%20%26%23x3B3%3B-TuRC-Activating%20CM1%20Domain.%26%23x201D%3B%20%26lt%3Bi%26gt%3BThe%20Journal%20of%20Cell%20Biology%26lt%3B%5C%2Fi%26gt%3B%20225%20%2811%29%3A%20e202605160.%20%26lt%3Ba%20class%3D%26%23039%3Bzp-DOIURL%26%23039%3B%20href%3D%26%23039%3Bhttps%3A%5C%2F%5C%2Fdoi.org%5C%2F10.1083%5C%2Fjcb.202605160%26%23039%3B%26gt%3Bhttps%3A%5C%2F%5C%2Fdoi.org%5C%2F10.1083%5C%2Fjcb.202605160%26lt%3B%5C%2Fa%26gt%3B.%26lt%3B%5C%2Fdiv%26gt%3B%5Cn%26lt%3B%5C%2Fdiv%26gt%3B%22%2C%22data%22%3A%7B%22itemType%22%3A%22journalArticle%22%2C%22title%22%3A%22A%20structural%20model%20for%20the%20autoinhibition%20of%20the%20%5Cu03b3-TuRC-activating%20CM1%20domain%22%2C%22creators%22%3A%5B%7B%22creatorType%22%3A%22author%22%2C%22firstName%22%3A%22Abir%22%2C%22lastName%22%3A%22Elfarkouchi%22%7D%2C%7B%22creatorType%22%3A%22author%22%2C%22firstName%22%3A%22Arthur%22%2C%22lastName%22%3A%22Vitard%22%7D%2C%7B%22creatorType%22%3A%22author%22%2C%22firstName%22%3A%22L%5Cu00e9a%22%2C%22lastName%22%3A%22Mammri%22%7D%2C%7B%22creatorType%22%3A%22author%22%2C%22firstName%22%3A%22S%5Cu00e9bastien%22%2C%22lastName%22%3A%22Brier%22%7D%2C%7B%22creatorType%22%3A%22author%22%2C%22firstName%22%3A%22Lola%22%2C%22lastName%22%3A%22Tanneur%22%7D%2C%7B%22creatorType%22%3A%22author%22%2C%22firstName%22%3A%22C%5Cu00e9cile%22%2C%22lastName%22%3A%22Hu%22%7D%2C%7B%22creatorType%22%3A%22author%22%2C%22firstName%22%3A%22Aur%5Cu00e9lien%22%2C%22lastName%22%3A%22Thureau%22%7D%2C%7B%22creatorType%22%3A%22author%22%2C%22firstName%22%3A%22Nicolas%22%2C%22lastName%22%3A%22Joly%22%7D%2C%7B%22creatorType%22%3A%22author%22%2C%22firstName%22%3A%22Francoise%22%2C%22lastName%22%3A%22Ochsenbein%22%7D%2C%7B%22creatorType%22%3A%22author%22%2C%22firstName%22%3A%22Paul%20T.%22%2C%22lastName%22%3A%22Conduit%22%7D%5D%2C%22abstractNote%22%3A%22Microtubule%20nucleation%20by%20%5Cu03b3-tubulin%20ring%20complexes%20%28%5Cu03b3-TuRCs%29%20must%20be%20spatiotemporally%20controlled%20to%20avoid%20major%20cell%20division%20errors.%20%5Cu03b3-TuRCs%20are%20activated%20by%20the%20centrosome-specific%20binding%20of%20a%20highly%20conserved%20centrosomin%20motif%201%20%28CM1%29%20domain%2C%20but%20how%20binding%20is%20prevented%20in%20the%20cytosol%20remains%20unclear.%20We%20provide%20the%20first%20structural%20explanation%20for%20CM1%20autoinhibition%2C%20revealing%20that%20stable%20intramolecular%20interactions%20mediate%20cooperative%20folding%20to%20block%20%5Cu03b3-TuRC-binding%20interfaces.%20Using%20various%20structural%20approaches%2C%20we%20show%20that%20CM1%20forms%20a%20conserved%20dimeric%20coiled-coil%20hairpin%20that%20sequesters%20a%20key%20phenylalanine%20residue%20essential%20for%20%5Cu03b3-TuRC%20binding.%20This%20appears%20sufficient%20for%20autoinhibition%20in%20humans%2C%20but%20in%20flies%20autoinhibition%20requires%20the%20association%20of%20an%20upstream%20CM1%20autoinhibition%20%28CAI%29%20domain%2C%20which%20forms%20a%204-helix%20dimer%20that%20covers%20the%20opposite%20phenylalanine%20residue%20of%20the%20hairpin%20dimer.%20Collectively%2C%20the%20data%20provide%20the%20first%20structural%20model%20for%20CM1%20autoinhibition%20and%20reveal%20evolutionary%20differences%20across%20species.%22%2C%22date%22%3A%222026-11-02%22%2C%22section%22%3A%22%22%2C%22partNumber%22%3A%22%22%2C%22partTitle%22%3A%22%22%2C%22DOI%22%3A%2210.1083%5C%2Fjcb.202605160%22%2C%22citationKey%22%3A%22%22%2C%22url%22%3A%22%22%2C%22PMID%22%3A%2242814412%22%2C%22PMCID%22%3A%22%22%2C%22ISSN%22%3A%221540-8140%22%2C%22language%22%3A%22eng%22%2C%22collections%22%3A%5B%5D%2C%22dateModified%22%3A%222026-10-01T12%3A01%3A26Z%22%7D%7D%2C%7B%22key%22%3A%22FCF6WTDR%22%2C%22library%22%3A%7B%22id%22%3A3888256%7D%2C%22meta%22%3A%7B%22creatorSummary%22%3A%22Funke%20et%20al.%22%2C%22parsedDate%22%3A%222026-10-28%22%2C%22numChildren%22%3A1%7D%2C%22bib%22%3A%22%26lt%3Bdiv%20class%3D%26quot%3Bcsl-bib-body%26quot%3B%20style%3D%26quot%3Bline-height%3A%201.35%3B%20padding-left%3A%201em%3B%20text-indent%3A-1em%3B%26quot%3B%26gt%3B%5Cn%20%20%26lt%3Bdiv%20class%3D%26quot%3Bcsl-entry%26quot%3B%26gt%3BFunke%2C%20Pauline%2C%20Mathilde%20Roth%2C%20Thibaud%20Dieudonn%26%23xE9%3B%2C%20and%20Guillaume%20Lenoir.%202026.%20%26%23x201C%3BRecent%20Advances%20in%20Understanding%20the%20Regulatory%20Mechanisms%20of%20P4-ATPase%20Lipid%20Flippases.%26%23x201D%3B%20%26lt%3Bi%26gt%3BBiochemical%20Society%20Transactions%26lt%3B%5C%2Fi%26gt%3B%2054%20%2810%29%3A%201407%26%23x2013%3B17.%20%26lt%3Ba%20class%3D%26%23039%3Bzp-DOIURL%26%23039%3B%20href%3D%26%23039%3Bhttps%3A%5C%2F%5C%2Fdoi.org%5C%2F10.1042%5C%2FBST20260203%26%23039%3B%26gt%3Bhttps%3A%5C%2F%5C%2Fdoi.org%5C%2F10.1042%5C%2FBST20260203%26lt%3B%5C%2Fa%26gt%3B.%26lt%3B%5C%2Fdiv%26gt%3B%5Cn%26lt%3B%5C%2Fdiv%26gt%3B%22%2C%22data%22%3A%7B%22itemType%22%3A%22journalArticle%22%2C%22title%22%3A%22Recent%20advances%20in%20understanding%20the%20regulatory%20mechanisms%20of%20P4-ATPase%20lipid%20flippases%22%2C%22creators%22%3A%5B%7B%22creatorType%22%3A%22author%22%2C%22firstName%22%3A%22Pauline%22%2C%22lastName%22%3A%22Funke%22%7D%2C%7B%22creatorType%22%3A%22author%22%2C%22firstName%22%3A%22Mathilde%22%2C%22lastName%22%3A%22Roth%22%7D%2C%7B%22creatorType%22%3A%22author%22%2C%22firstName%22%3A%22Thibaud%22%2C%22lastName%22%3A%22Dieudonn%5Cu00e9%22%7D%2C%7B%22creatorType%22%3A%22author%22%2C%22firstName%22%3A%22Guillaume%22%2C%22lastName%22%3A%22Lenoir%22%7D%5D%2C%22abstractNote%22%3A%22P4-ATPases%20establish%20and%20maintain%20transbilayer%20lipid%20asymmetry%20in%20eukaryotic%20membranes%20by%20transporting%20phospholipids%20from%20the%20exoplasmic%20to%20the%20cytosolic%20membrane%20leaflet%20at%20the%20expense%20of%20ATP%20hydrolysis.%20In%20recent%20years%2C%20biochemical%20analysis%20together%20with%20an%20increasing%20number%20of%20cryo-electron%20microscopy%20structures%20has%20substantially%20increased%20our%20understanding%20of%20the%20lipid%20transport%20cycle%20and%20substrate%20recognition%20by%20P4-ATPases.%20However%2C%20the%20underlying%20molecular%20mechanism%20governing%20P4-ATPase%20activation%20and%20regulation%20remains%20less%20well%20understood.%20The%20present%20review%20aims%20to%20summarize%20current%20insights%20into%20the%20molecular%20mechanisms%20controlling%20P4-ATPase%20activation%20and%20regulation.%20We%20discuss%20autoinhibition%20by%20N-%20and%20C-terminal%20extensions%2C%20activation%20by%20regulatory%20lipids%2C%20particularly%20phosphoinositides%2C%20regulation%20by%20interacting%20proteins%20including%20small%20GTPases%20and%20guanine%20nucleotide%20exchange%20factors%2C%20and%20post-translational%20modifications%2C%20especially%20phosphorylation.%20Together%2C%20these%20studies%20reveal%20that%20P4-ATPase%20activity%20is%20controlled%20by%20a%20complex%20and%20multilayered%20regulatory%20network%20that%20enables%20precise%20control%20of%20lipid%20transport.%20Future%20studies%20combining%20structural%2C%20biochemical%2C%20and%20cellular%20approaches%20will%20be%20essential%20to%20elucidate%20how%20these%20mechanisms%20cooperate%20to%20maintain%20membrane%20lipid%20homeostasis%20and%20support%20diverse%20cellular%20functions.%22%2C%22date%22%3A%222026-10-28%22%2C%22section%22%3A%22%22%2C%22partNumber%22%3A%22%22%2C%22partTitle%22%3A%22%22%2C%22DOI%22%3A%2210.1042%5C%2FBST20260203%22%2C%22citationKey%22%3A%22%22%2C%22url%22%3A%22%22%2C%22PMID%22%3A%2242831388%22%2C%22PMCID%22%3A%22%22%2C%22ISSN%22%3A%221470-8752%22%2C%22language%22%3A%22eng%22%2C%22collections%22%3A%5B%5D%2C%22dateModified%22%3A%222026-10-06T08%3A56%3A45Z%22%7D%7D%2C%7B%22key%22%3A%22GZDYM4ZI%22%2C%22library%22%3A%7B%22id%22%3A3888256%7D%2C%22meta%22%3A%7B%22creatorSummary%22%3A%22Bercy%20et%20al.%22%2C%22parsedDate%22%3A%222026-10-06%22%2C%22numChildren%22%3A1%7D%2C%22bib%22%3A%22%26lt%3Bdiv%20class%3D%26quot%3Bcsl-bib-body%26quot%3B%20style%3D%26quot%3Bline-height%3A%201.35%3B%20padding-left%3A%201em%3B%20text-indent%3A-1em%3B%26quot%3B%26gt%3B%5Cn%20%20%26lt%3Bdiv%20class%3D%26quot%3Bcsl-entry%26quot%3B%26gt%3BBercy%2C%20Roxanne%2C%20Juan%20J.%20Romero%2C%20Radek%20Litvin%2C%20et%20al.%202026.%20%26%23x201C%3BDistortion-Induced%20Tuning%20of%20Chlorophyll%20a%20Electronic%20Properties%20in%20LHC%20Proteins.%26%23x201D%3B%20%26lt%3Bi%26gt%3BBiochimica%20Et%20Biophysica%20Acta.%20Bioenergetics%26lt%3B%5C%2Fi%26gt%3B%2C%20October%206%2C%20149614.%20%26lt%3Ba%20class%3D%26%23039%3Bzp-DOIURL%26%23039%3B%20href%3D%26%23039%3Bhttps%3A%5C%2F%5C%2Fdoi.org%5C%2F10.1016%5C%2Fj.bbabio.2026.149614%26%23039%3B%26gt%3Bhttps%3A%5C%2F%5C%2Fdoi.org%5C%2F10.1016%5C%2Fj.bbabio.2026.149614%26lt%3B%5C%2Fa%26gt%3B.%26lt%3B%5C%2Fdiv%26gt%3B%5Cn%26lt%3B%5C%2Fdiv%26gt%3B%22%2C%22data%22%3A%7B%22itemType%22%3A%22journalArticle%22%2C%22title%22%3A%22Distortion-induced%20tuning%20of%20chlorophyll%20a%20electronic%20properties%20in%20LHC%20proteins%22%2C%22creators%22%3A%5B%7B%22creatorType%22%3A%22author%22%2C%22firstName%22%3A%22Roxanne%22%2C%22lastName%22%3A%22Bercy%22%7D%2C%7B%22creatorType%22%3A%22author%22%2C%22firstName%22%3A%22Juan%20J.%22%2C%22lastName%22%3A%22Romero%22%7D%2C%7B%22creatorType%22%3A%22author%22%2C%22firstName%22%3A%22Radek%22%2C%22lastName%22%3A%22Litvin%22%7D%2C%7B%22creatorType%22%3A%22author%22%2C%22firstName%22%3A%22David%22%2C%22lastName%22%3A%22Bina%22%7D%2C%7B%22creatorType%22%3A%22author%22%2C%22firstName%22%3A%22Daniel%22%2C%22lastName%22%3A%22Finkelstein-Shapiro%22%7D%2C%7B%22creatorType%22%3A%22author%22%2C%22firstName%22%3A%22Cristian%22%2C%22lastName%22%3A%22Ilioaia%22%7D%2C%7B%22creatorType%22%3A%22author%22%2C%22firstName%22%3A%22Andrew%20A.%22%2C%22lastName%22%3A%22Pascal%22%7D%2C%7B%22creatorType%22%3A%22author%22%2C%22firstName%22%3A%22Bruno%22%2C%22lastName%22%3A%22Robert%22%7D%2C%7B%22creatorType%22%3A%22author%22%2C%22firstName%22%3A%22Manuel%20J.%22%2C%22lastName%22%3A%22Llansola-Portoles%22%7D%5D%2C%22abstractNote%22%3A%22In%20eukaryotic%20light-harvesting%20complexes%2C%20the%20protein%20host%20tunes%20chlorophyll-a%20%28Chl%20a%29%20site%20energies%20through%20a%20number%20of%20mechanisms%20%28e.g.%20hydrogen%20bonding%3B%20excitonic%5C%2Fcharge-transfer%20%28CT%29%20mixing%29.%20However%2C%20whether%20protein-imposed%20macrocycle%20distortions%20also%20contribute%20to%20fine-tuning%20this%20energy%20remains%20unclear.%20We%20have%20investigated%20three%20Chl%20a-only%20algal%20antennas%20-%20VCP%20%28from%20Nannochloropsis%20oceanica%29%2C%20rVCP%20%28Trachydiscus%20minutus%29%2C%20and%20CLH%20%28Chromera%20velia%29.%20These%20complexes%20show%20distinct%20red-shifted%20absorption%20features%2C%20which%20at%2077%5Cu202fK%20range%20from%20670%5Cu202fnm%20up%20to%20an%20extremely%20red-shifted%20band%20at%20700%5Cu202fnm%20%28rVCP%29.%20By%20analysis%20of%20marker%20bands%20in%20excitation-selective%20resonance%20Raman%20spectra%2C%20we%20have%20determined%20the%20contribution%20of%20%28i%29%20hydrogen%20bonding%20to%20the%20keto%20group%20%281630-1700%5Cu202fcm-1%20region%29%2C%20and%5C%2For%20%28ii%29%20macrocycle%20distortion%20%28bands%20near%201555%20and%201612%5Cu202fcm-1%29%20to%20these%20red-shifts.%20Finally%2C%20the%20absence%20of%20vibrational%20features%20in%20fluorescence%20line-narrowing%20measurements%20for%20the%20reddest%20rVCP%20band%20is%20consistent%20with%20strong%20excitonic%20coupling%2C%20which%20we%20suggest%20is%20at%20the%20origin%20of%20this%20large%20red%20shift.%20Our%20results%20indicate%20that%20tuning%20of%20the%20functional%20properties%20of%20Chl%20a%20antennas%20may%20occur%20via%20distortion%20of%20the%20macrocycle.%22%2C%22date%22%3A%222026-10-06%22%2C%22section%22%3A%22%22%2C%22partNumber%22%3A%22%22%2C%22partTitle%22%3A%22%22%2C%22DOI%22%3A%2210.1016%5C%2Fj.bbabio.2026.149614%22%2C%22citationKey%22%3A%22%22%2C%22url%22%3A%22%22%2C%22PMID%22%3A%2242838278%22%2C%22PMCID%22%3A%22%22%2C%22ISSN%22%3A%221879-2650%22%2C%22language%22%3A%22eng%22%2C%22collections%22%3A%5B%5D%2C%22dateModified%22%3A%222026-10-07T13%3A48%3A14Z%22%7D%7D%2C%7B%22key%22%3A%22XECJ9RC7%22%2C%22library%22%3A%7B%22id%22%3A3888256%7D%2C%22meta%22%3A%7B%22creatorSummary%22%3A%22Llansola-Portoles%20et%20al.%22%2C%22parsedDate%22%3A%222026-10-02%22%2C%22numChildren%22%3A2%7D%2C%22bib%22%3A%22%26lt%3Bdiv%20class%3D%26quot%3Bcsl-bib-body%26quot%3B%20style%3D%26quot%3Bline-height%3A%201.35%3B%20padding-left%3A%201em%3B%20text-indent%3A-1em%3B%26quot%3B%26gt%3B%5Cn%20%20%26lt%3Bdiv%20class%3D%26quot%3Bcsl-entry%26quot%3B%26gt%3BLlansola-Portoles%2C%20Manuel%20J.%2C%20James%20N.%20Sturgis%2C%20Andrew%20Gall%2C%20et%20al.%202026.%20%26%23x201C%3BVibronic%20Landscape%20of%20Excitons%20in%20Photosynthetic%20Antenna.%26%23x201D%3B%20%26lt%3Bi%26gt%3BPhysical%20Chemistry%20Chemical%20Physics%26lt%3B%5C%2Fi%26gt%3B%2C%20ahead%20of%20print%2C%20October%202.%20%26lt%3Ba%20class%3D%26%23039%3Bzp-ItemURL%26%23039%3B%20href%3D%26%23039%3Bhttps%3A%5C%2F%5C%2Fdoi.org%5C%2F10.1039%5C%2FD6CP02540D%26%23039%3B%26gt%3Bhttps%3A%5C%2F%5C%2Fdoi.org%5C%2F10.1039%5C%2FD6CP02540D%26lt%3B%5C%2Fa%26gt%3B.%26lt%3B%5C%2Fdiv%26gt%3B%5Cn%26lt%3B%5C%2Fdiv%26gt%3B%22%2C%22data%22%3A%7B%22itemType%22%3A%22journalArticle%22%2C%22title%22%3A%22Vibronic%20Landscape%20of%20Excitons%20in%20Photosynthetic%20Antenna%22%2C%22creators%22%3A%5B%7B%22creatorType%22%3A%22author%22%2C%22firstName%22%3A%22Manuel%20J.%22%2C%22lastName%22%3A%22Llansola-Portoles%22%7D%2C%7B%22creatorType%22%3A%22author%22%2C%22firstName%22%3A%22James%20N.%22%2C%22lastName%22%3A%22Sturgis%22%7D%2C%7B%22creatorType%22%3A%22author%22%2C%22firstName%22%3A%22Andrew%22%2C%22lastName%22%3A%22Gall%22%7D%2C%7B%22creatorType%22%3A%22author%22%2C%22firstName%22%3A%22Juan%20J.%22%2C%22lastName%22%3A%22Romero%22%7D%2C%7B%22creatorType%22%3A%22author%22%2C%22firstName%22%3A%22Andrew%20%20A.%22%2C%22lastName%22%3A%22Pascal%22%7D%2C%7B%22creatorType%22%3A%22author%22%2C%22firstName%22%3A%22Leonas%22%2C%22lastName%22%3A%22Valk%5Cu016bnas%22%7D%2C%7B%22creatorType%22%3A%22author%22%2C%22firstName%22%3A%22Bruno%22%2C%22lastName%22%3A%22Robert%22%7D%5D%2C%22abstractNote%22%3A%22Light-harvesting%20and%20excitation%20energy%20transfer%20in%20photosynthesis%20generally%20involve%20chlorophyll-molecules%2C%20maintained%20by%20their%20host%20proteins%20at%20short%20distances%20from%20each%20other%2C%20this%20resulting%20in%20excitonic%20coupling.%20The%20transfer%20of%20excitation%20energy%20to%20the%20reaction%20centers%20consists%20of%20exciton%20migration%20and%20relaxation%20within%20and%20between%20photosynthetic%20proteins.%20The%20dynamics%20of%20this%20process%20depends%20on%20the%20vibrational%20modes%20resonant%20with%20the%20energy%20gaps%20between%20the%20participating%20excited%20states.%20The%20precise%20structure%20and%20vibrational%20landscape%20of%20excitons%20is%20thus%20essential%20knowledge%20to%20understand%20the%20amazing%20efficiency%20of%20photosynthesis.%20In%20this%20work%2C%20we%20characterize%20the%20vibrational%20properties%20of%20excitons%20in%20light-harvesting%20proteins%20from%20purple%20photosynthetic%20bacteria%2C%20which%20remarkably%20unveil%20on%20how%20many%20bacteriochlorophylls%20they%20reside%20and%20in%20which%20proportions.%20Vibrational%20spectra%20obtained%20from%20bacteriochlorophylls%20in%20proteins%20generally%20contain%20additional%20vibronic%20contributions%20when%20compared%20to%20isolated%20pigments%2C%20opening%20additional%20pathways%20for%20vibrationally-assisted%20excitation%20energy%20transfer.%20In%20contrast%2C%20the%20absence%20of%20new%20vibronic%20contributions%20in%20the%20spectra%20of%20chlorophyll-containing%20photosynthetic%20proteins%20above%20100%20cm-1%20suggests%20that%20in%20oxygenic%20photosynthesis%2C%20vibrationally-assisted%20excitation%20energy%20transfers%20occurs%20through%20vibrational%20modes%20of%20chlorophyll%20molecules%20in%20equilibrium%20configuration.%22%2C%22date%22%3A%222026-10-02%22%2C%22section%22%3A%22%22%2C%22partNumber%22%3A%22%22%2C%22partTitle%22%3A%22%22%2C%22DOI%22%3A%2210.1039%5C%2FD6CP02540D%22%2C%22citationKey%22%3A%22%22%2C%22url%22%3A%22https%3A%5C%2F%5C%2Fdoi.org%5C%2F10.1039%5C%2FD6CP02540D%22%2C%22PMID%22%3A%22%22%2C%22PMCID%22%3A%22%22%2C%22ISSN%22%3A%221463-9076%22%2C%22language%22%3A%22%22%2C%22collections%22%3A%5B%5D%2C%22dateModified%22%3A%222026-10-02T09%3A16%3A41Z%22%7D%7D%5D%7D
Boëffard-Dosierre, Liza, Camille Dagallier, Géraldine Eudier, et al. 2026. “NMR Detects Clustering and Ultra-Weak Excipient Interactions Governing Monoclonal Antibody Viscosity in Formulation-Relevant Conditions.” mAbs 18 (1): 2685366. https://doi.org/10.1080/19420862.2026.2685366.
Elfarkouchi, Abir, Arthur Vitard, Léa Mammri, et al. 2026. “A Structural Model for the Autoinhibition of the γ-TuRC-Activating CM1 Domain.” The Journal of Cell Biology 225 (11): e202605160. https://doi.org/10.1083/jcb.202605160.
Funke, Pauline, Mathilde Roth, Thibaud Dieudonné, and Guillaume Lenoir. 2026. “Recent Advances in Understanding the Regulatory Mechanisms of P4-ATPase Lipid Flippases.” Biochemical Society Transactions 54 (10): 1407–17. https://doi.org/10.1042/BST20260203.
Bercy, Roxanne, Juan J. Romero, Radek Litvin, et al. 2026. “Distortion-Induced Tuning of Chlorophyll a Electronic Properties in LHC Proteins.” Biochimica Et Biophysica Acta. Bioenergetics, October 6, 149614. https://doi.org/10.1016/j.bbabio.2026.149614.
Llansola-Portoles, Manuel J., James N. Sturgis, Andrew Gall, et al. 2026. “Vibronic Landscape of Excitons in Photosynthetic Antenna.” Physical Chemistry Chemical Physics, ahead of print, October 2. https://doi.org/10.1039/D6CP02540D.

Education

Scroll to Top