UNSPECIFIED (1991) REGULATION OF PROTEIN-PHOSPHORYLATION IN THE CYANOBACTERIUM ANABAENA STRAIN PCC-7120. JOURNAL OF GENERAL MICROBIOLOGY, 137 (Part 2). pp. 331-339. ISSN 0022-1287

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Abstract

Protein kinase activities have been detected in cell-free extracts of the cyanobacterium Anabaena PCC 7120. At least 12 polypeptides in the soluble fraction were phosphorylated in vitro at the expense of [gamma-32P]ATP and the pattern of phosphorylation was shown to be regulated by intermediary metabolites and other effectors, at physiological concentrations. Glucose 6-phosphate exerted a regulatory effect on a phosphopolypeptide of M(r) 56000 (p56) by stimulating a protein phosphatase, whereas ribulose 5-phosphate inhibited the corresponding protein kinase. In addition, DTT and the calmodulin antagonist trifluoperazine influenced the phosphorylation state of several different polypeptides, indicative of control by redox conditions and a calmodulin-like mediator, respectively. Furthermore, it was established that the phosphorylation of p56 required Mg2+ (> 100-mu-M) whereas that of a polypeptide of M(r) 16000 occurred in the absence of Mg2+ and was inhibited by high concentrations (> 1 mM) of this cation. Several of the phosphopolypeptides detected in vitro corresponded in mobility on SDS-PAGE to species phosphorylated in vivo.

Item Type:	Journal Article
Subjects:	Q Science > QR Microbiology
Journal or Publication Title:	JOURNAL OF GENERAL MICROBIOLOGY
Publisher:	SOC GENERAL MICROBIOLOGY
ISSN:	0022-1287
Date:	February 1991
Volume:	137
Number:	Part 2
Number of Pages:	9
Page Range:	pp. 331-339
Publication Status:	Published
URI:	http://wrap.warwick.ac.uk/id/eprint/22865

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