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New linker proteins in phycobilisomes isolated from the cyanobacterium Gloeobacter violaceus PCC 7421 |
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| Authors: | Koyama Kohei Tsuchiya Tohru Akimoto Seiji Yokono Makio Miyashita Hideaki Mimuro Mamoru |
| Institution: | Department of Interdisciplinary Environment, Graduate School of Human and Environmental Studies, Kyoto University, Japan. |
| Abstract: | Two new linker proteins were identified by peptide mass fingerprinting in phycobilisomes isolated from the cyanobacterium Gloeobacter violaceus PCC 7421. The proteins were products of glr1262 and glr2806. Three tandem phycocyanin linker motifs similar to CpcC were present in each. The glr1262 product most probably functions as a rod linker connecting phycoerythrin and phycocyanin, while the glr2806 product may function as a rod-core linker. We have designated these two proteins CpeG and CpcJ, respectively. The morphology of phycobilisomes in G. violaceus has been reported to be a bundle-like shape with six rods, consistent with the proposed functions of these linkers. |
| Keywords: | APC allophycocyanin Chl chlorophyll LC core linker LCM core-membrane linker LR rod linker LRC rod-core linker PBP phycobiliprotein PBS phycobilisome PC phycocyanin PE phycoerythrin PMF peptide mass fingerprinting PS photosystem |
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