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Title: Quantitative assessment of chlorophyll types in cryo-EM maps of photosystem I acclimated to far-red light

Journal Article · · BBA Advances

Chlorophyll cofactors are vital for the metabolism of photosynthetic organisms. Cryo-electron microscopy (cryo-EM) has been used to elucidate molecular structures of pigment-protein complexes, but the minor structural differences between multiple types of chlorophylls make them difficult to distinguish in cryo-EM maps. This is exemplified by inconsistencies in the assignments of chlorophyll f molecules in structures of photosystem I acclimated to far-red light (FRL-PSI). A quantitative assessment of chlorophyll substituents in cryo-EM maps was used to identify chlorophyll f-binding sites in structures of FRL-PSI from two cyanobacteria. The two cryo-EM maps provide direct evidence for chlorophyll f-binding at two and three binding sites, respectively, and three more sites in each structure exhibit strong indirect evidence for chlorophyll f binding. Common themes in chlorophyll f binding are described that clarify the current understanding of the molecular basis for FRL photoacclimation in photosystems.

Research Organization:
Yale Univ., New Haven, CT (United States)
Sponsoring Organization:
USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division; National Science Foundation (NSF)
Grant/Contract Number:
FG02-05ER15646; SC0001423; MCB-1613022
OSTI ID:
1798902
Alternate ID(s):
OSTI ID: 1860613
Journal Information:
BBA Advances, Journal Name: BBA Advances Vol. 1 Journal Issue: C; ISSN 2667-1603
Publisher:
ElsevierCopyright Statement
Country of Publication:
Netherlands
Language:
English

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