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Mass spectrometry analysis of the photosystem II assembly factor Psb27 revealed variations in its lipid modification
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Mass spectrometry analysis of the photosystem II assembly factor Psb27 revealed variations in its lipid modification
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Journal Article
Mass spectrometry analysis of the photosystem II assembly factor Psb27 revealed variations in its lipid modification
2022
Overview
The assembly of large, multi-cofactor membrane protein complexes like photosystem II (PSII) requires a high level of coordination. The process is facilitated by a large network of auxiliary proteins that bind transiently to unassembled subunits, preassembled modules or intermediate states of PSII, which are comprised of a subset of subunits. However, analysis of these immature, partially assembled PSII complexes is hampered by their low abundance and intrinsic instability. In this study, PSII was purified from the thermophilic cyanobacterium Thermosynechococcus elongatus via Twin-Strep-tagged CP43 and further separated by ion exchange chromatography into mature and immature complexes. Mass spectrometry analysis of the immature Psb27-PSII intermediate revealed six different Psb27 proteoforms with distinct lipid modifications. The maturation and functional role of thylakoid localized lipoproteins are discussed.
Publisher
Springer Nature B.V
Subject
