Proteomic approach to characterize the supramolecular organization of photosystems in higher plants.

Abstract:

:A project to investigate the supramolecular structure of photosystems was initiated, which is based on protein solubilizations by digitonin, protein separations by Blue native (BN)-polyacrylamide gel electrophoresis (PAGE) and protein identifications by mass spectrometry (MS). Under the conditions applied, nine photosystem supercomplexes could be described for chloroplasts of Arabidopsis, which have apparent molecular masses between 600 and 3200 kDa on BN gels. Identities of the supercomplexes were determined on the basis of their subunit compositions as documented by 2D BN/SDS-PAGE and BN/BN-PAGE. Two supercomplexes of 1060 and approximately 1600 kDa represent dimeric and trimeric forms of photosystem I (PSI), which include tightly bound LHCI proteins. Compared to monomeric PSI, these protein complexes are of low abundance. In contrast, photosystem II mainly forms part of dominant supercomplexes of 850, 1000, 1050 and 1300 kDa. According to our interpretation, these supercomplexes contain dimeric PSII, 1-4 LHCII trimers and additionally monomeric LHCII proteins. The 1300-kDa PSII supercomplex (containing four LHCII trimers) is partially converted into the 1000-kDa PSII supercomplex (containing two LHCII trimers) in the presence of dodecylmaltoside on 2D BN/BN gels. Analyses of peptides of the trypsinated 1300-kDa PSII supercomplex by mass spectrometry allowed to identify known subunits of the PSII core complex and additionally LHCII proteins encoded by eight different genes in Arabidopsis. Further application of this experimental approach will allow new insights into the supermolecular organization of photosystems in plants.

journal_name

Phytochemistry

journal_title

Phytochemistry

authors

Heinemeyer J,Eubel H,Wehmhöner D,Jänsch L,Braun HP

doi

10.1016/j.phytochem.2004.04.022

subject

Has Abstract

pub_date

2004-06-01 00:00:00

pages

1683-92

issue

12

eissn

0031-9422

issn

1873-3700

pii

S0031942204001840

journal_volume

65

pub_type

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