Identification of photosystem I components from the cyanobacterium, Synechococcus vulcanus by N-terminal sequencing

FEBS Letters
H KoikeY Inoue

Abstract

The photosystem I core complex isolated from a thermophilic cyanobacterium, Synechococcus vulcanus, is composed of eight low-molecular-mass proteins of 18, 14, 12, 9.5, 9, 6.5, 5 and 4.1 kDa in addition to the PS I chlorophyll protein. N-terminal amino acid sequences of all these components were determined and compared with those of higher plants. Clearly, the 9.5 kDa component corresponds to the protein which carries the non-heme iron-sulfur centers A and B. This protein is so poorly visualized by staining that it has probably been overlooked in gel electrophoresis analyses. The 18, 14, 12 and 9 kDa components show appreciable homology with respective subunits of higher plant PS I. In contrast, the 6.5, 5 and 4.1 kDa components do not correspond to any known proteins except that the sequence of the 4.1 kDa component matches an unidentified open reading frame (ORF) 42 (liverwort) or ORF44 (tobacco) of chloroplast DNA.

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Citations

Oct 24, 1998·Progress in Biophysics and Molecular Biology·H Sticht, P Rösch
Jun 25, 1990·Nucleic Acids Research·T ShimizuY Inoue
Jul 1, 1991·Journal of Basic and Clinical Physiology and Pharmacology·O AlmogR Nechushtai
Jun 25, 2005·Photosynthesis Research·Ingo Grotjohann, Petra Fromme
Aug 27, 1996·Molecular & General Genetics : MGG·U Mühlenhoff, F Chauvat
Mar 25, 1991·FEBS Letters·M Ikeuchi, Y Inoue
Nov 1, 2001·Biochimica Et Biophysica Acta·P FrommeN Krauss
Jul 5, 1993·Biochimica Et Biophysica Acta·N Weber, H Strotmann

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