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Volume 264, number 1, 25-28 FEES 08384 May 1990 Modification of a glnB-like gene product by photosynthetic electron
 

Summary: Volume 264, number 1, 25-28 FEES 08384 May 1990
Modification of a glnB-like gene product by photosynthetic electron
transport in the cyanobacterium Synechococcus 6301
Michael A. Harrison, Jeffrey N. Keen4',John B.C. Findlay4' and John F. Alien*
Department of Pure and Applied Biology and +Department of Biochemistry, The University of Leeds, Leeds LS2 9JT, UK
Received 26 February 1990
Covalent modification of a 13 kDa soluble-phase protein occurs during adaptation of cells of the cyanobacterium Synechococcus 6301 (mutant
AN112) to light specifically absorbed by photosystem 11. This adaptation is accompanied by functional changes indicative of altered excitation
energy distribution between the photosystems. The 13 kDa protein is identified by solid-phase N-terminal sequencing as a protein related to P~I,
the glnB gene product of E. coli. In E. coli, the PIIprotein undergoes uridylylation and acts as a regulator of glutamine synthetase at both the
post-translational and transcriptional levels. The implications of modification of a transcriptional regulator by photosynthetic electron transport
are discussed.
Photosynthesis; Post-translational modification; Glutamine synthetase; Transcriptional regulator; Electron transport; Redox control;
Synechococcus6301
1. INTRODUCTION
Post-translational modification by protein
phosphorylation is known to alter functional properties
of chloroplast thylakoid membrane proteins involved
in light-harvesting in photosynthesis 11-31. An im-
balance in photosystem turnover induced by preferen-

  

Source: Allen, John F. - School of Biological and Chemical Sciences, Queen Mary, University of London

 

Collections: Renewable Energy; Biology and Medicine