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From cytoplasm to lumen—mapping the free pools of protein subunits of three photosynthetic complexes using quantitative mass spectrometry

Journal Article · · FEBS Letters
The phycobilisome (PBS) captures light energy and transfers it to photosystem I (PSI) and photosystem II (PSII). Which and how many copies of protein subunits in PBSs, PSI, and PSII remain unbound in thylakoids are unknown. Here, quantitative mass spectrometry (QMS) was used to quantify substantial pools of free extrinsic subunits of PSII and PSI. Interestingly, the membrane intrinsic PsaL is 3-fold higher than PsaA/B. This scenario complements the static structures of these complexes as revealed by X-ray crystallography and cryo-EM. Furthermore, the ratios of ApcG and photoprotective OCP over PBS indicate a pool of extra ApcG. The 2.5 ratio of CpcG-PBS over CpcL-PBS improves our understanding of these light-harvesting complexes involved in energy capture and photoprotection in cyanobacteria.
Research Organization:
Saint Louis University, MO (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); Biotechnology and Biological Sciences Research Council UK; European Research Council Synergy
Grant/Contract Number:
SC0025019; SC0020304
OSTI ID:
3000717
Journal Information:
FEBS Letters, Journal Name: FEBS Letters Journal Issue: 10 Vol. 599; ISSN 0014-5793; ISSN 1873-3468
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English

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