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Title: Photosystem I-LHCII megacomplexes respond to high light and aging in plants

Journal Article · · Photosynthesis Research

Photosystem II is known to be a highly dynamic multi-protein complex that participates in a variety of regulatory and repair processes. In contrast, photosystem I (PSI) has, until quite recently, been thought of as relatively static. We report the discovery of plant PSI-LHCII megacomplexes containing multiple LHCII trimers per PSI reaction center. These PSI-LHCII megacomplexes respond rapidly to changes in light intensity, as visualized by native gel electrophoresis. PSI-LHCII megacomplex formation was found to require thylakoid stacking, and to depend upon growth light intensity and leaf age. These factors were, in turn, correlated with changes in PSI/PSII ratios and, intriguingly, PSI-LHCII megacomplex dynamics appeared to depend upon PSII core phosphorylation. Thus, these findings suggest new functions for PSI and a new level of regulation involving specialized subpopulations of photosystem I which have profound implications for current models of thylakoid dynamics.

Research Organization:
Washington State Univ., Pullman, WA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
FG02-04ER 15559; FG02-04ER15559
OSTI ID:
1396408
Alternate ID(s):
OSTI ID: 1501434
Journal Information:
Photosynthesis Research, Journal Name: Photosynthesis Research Vol. 136 Journal Issue: 1; ISSN 0166-8595
Publisher:
SpringerCopyright Statement
Country of Publication:
Netherlands
Language:
English
Citation Metrics:
Cited by: 15 works
Citation information provided by
Web of Science

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