Biochemical characterization of a recombinant Swainsona canescens calcium-dependent protein kinase (ScCPK1)

Srideshikan, SM and Vanishree, VL and Jayabaskaran, C (2012) Biochemical characterization of a recombinant Swainsona canescens calcium-dependent protein kinase (ScCPK1). In: PLANT PHYSIOLOGY AND BIOCHEMISTRY, 54 . pp. 27-33.

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Abstract

Calcium-dependent protein kinases (CPKs) constitute a unique family of kinases involved in many physiological responses in plants. Biochemical and kinetic properties of a recombinant Swainsona canescens calcium-dependent protein kinase (ScCPK1) were examined in this study. The optimum pH and temperature for activity were pH 7.5 and 37 degrees C, respectively. Substrate phosphorylation activity of ScCPK1 was calmodulin (CaM) independent. Yet CaM antagonists, W7 N-(6-aminohexyl)-5-chloro-1-naphthalene sulphonamide] and calmidazolium inhibited the activity with IC50 values of 750 nM and 350 pM, respectively. Both serine and threonine residues were found to be phosphorylated in auto-phosphorylated ScCPK1 and in histone III-S phosphorylated by ScCPK1. The Ca2+] for half maximal activity (K-0.5) was found to be 0.4 mu M for ScCPK1 with histone III-S as substrate. Kinetic analysis showed that Km of ScCPK1 for histone III-S was 4.8 mu M. These data suggest that ScCPK1 is a functional Ser/Thr kinase, regulated by calcium, and may have a role in Ca2+-mediated signaling in S. canescens. (C) 2012 Elsevier Masson SAS. All rights reserved.

Item Type:	Journal Article
Publication:	PLANT PHYSIOLOGY AND BIOCHEMISTRY
Publisher:	Science Direct
Additional Information:	Copyright for this article belongs to Elsevier B V
Keywords:	CALMODULIN-LIKE DOMAIN;GENE FAMILY;REGULATORY DOMAIN; SEQUENCE;GENOME;L.;AUTOPHOSPHORYLATION;PURIFICATION; EXPRESSION;MEMBRANE
Department/Centre:	Division of Biological Sciences > Biochemistry
Date Deposited:	10 Jul 2012 07:16
Last Modified:	10 Jul 2012 07:16
URI:	http://eprints.iisc.ac.in/id/eprint/44598

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