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-Structure paper
タイトル | De novo design of proteins housing excitonically coupled chlorophyll special pairs. |
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ジャーナル・号・ページ | Nat Chem Biol, Vol. 20, Issue 7, Page 906-915, Year 2024 |
掲載日 | 2024年6月3日 |
著者 | Nathan M Ennist / Shunzhi Wang / Madison A Kennedy / Mariano Curti / George A Sutherland / Cvetelin Vasilev / Rachel L Redler / Valentin Maffeis / Saeed Shareef / Anthony V Sica / Ash Sueh Hua / Arundhati P Deshmukh / Adam P Moyer / Derrick R Hicks / Avi Z Swartz / Ralph A Cacho / Nathan Novy / Asim K Bera / Alex Kang / Banumathi Sankaran / Matthew P Johnson / Amala Phadkule / Mike Reppert / Damian Ekiert / Gira Bhabha / Lance Stewart / Justin R Caram / Barry L Stoddard / Elisabet Romero / C Neil Hunter / David Baker / |
PubMed 要旨 | Natural photosystems couple light harvesting to charge separation using a 'special pair' of chlorophyll molecules that accepts excitation energy from the antenna and initiates an electron-transfer ...Natural photosystems couple light harvesting to charge separation using a 'special pair' of chlorophyll molecules that accepts excitation energy from the antenna and initiates an electron-transfer cascade. To investigate the photophysics of special pairs independently of the complexities of native photosynthetic proteins, and as a first step toward creating synthetic photosystems for new energy conversion technologies, we designed C-symmetric proteins that hold two chlorophyll molecules in closely juxtaposed arrangements. X-ray crystallography confirmed that one designed protein binds two chlorophylls in the same orientation as native special pairs, whereas a second designed protein positions them in a previously unseen geometry. Spectroscopy revealed that the chlorophylls are excitonically coupled, and fluorescence lifetime imaging demonstrated energy transfer. The cryo-electron microscopy structure of a designed 24-chlorophyll octahedral nanocage with a special pair on each edge closely matched the design model. The results suggest that the de novo design of artificial photosynthetic systems is within reach of current computational methods. |
リンク | Nat Chem Biol / PubMed:38831036 / PubMed Central |
手法 | EM (単粒子) / X線回折 |
解像度 | 2 - 6.5 Å |
構造データ | EMDB-40208, PDB-8glt: EMDB-40209: Chlorophyll-binding region of de novo-designed nanocage O32-15 PDB-7unh: PDB-7uni: PDB-7unj: PDB-8evm: |
化合物 | ChemComp-EDO: ChemComp-HOH: ChemComp-OE9: ChemComp-PO4: ChemComp-PGE: ChemComp-SO4: |
由来 |
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キーワード | DE NOVO PROTEIN / design / homodimer / rosetta / symmetric / designed / circular tandem repeat protein / cTRP / apo / chlorophyll / Zn pheophorbide a methyl ester / Zn / de novo design / electron donor / photosynthetic / nanocage / helical repeats / chlorophyll-binding / octahedral symmetry |