UNSPECIFIED (2001) Calmodulin-RS20-Ca-4 complex in the gas phase: electrospray ionisation and Fourier transform ion cyclotron resonance. EUROPEAN JOURNAL OF MASS SPECTROMETRY, 7 (4-5). pp. 393-398. ISSN 1469-0667

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Abstract

Dissociation of the complex between calmodulin, four calcium ions and the synthetic peptide RS20 derived from the phosphorylation site of smooth-muscle myosin light-chain kinase was studied by sustained off-resonance irradiation/collision-induced dissociation (SORI-CID) and electrospray ionisation (ESI) Fourier transform ion cyclotron resonance (FT-ICR) mass spectrometry. Gas-phase dissociation of isolated ions of calmodulin-RS20-Ca, in the 8+ charge state yielded fragments via two parallel pathways; calmodulin-Ca-4, complex ions in 5+ and 6+ charge states and RS20 ions in 2+ and 3+ charge states were detected at high resolution. The results are interpreted as indicating that RS20 binding to calmodulin in this complex is specific, involving particular non-covalent interactions that decompose readily during collision-induced dissociation. More specifically, it is proposed that the gas-phase dissociation of calmodulin-RS20-Ca-4 complex reflects the existence in vacuo of salt bridges.

Item Type:	Journal Article
Subjects:	Q Science > QC Physics
Journal or Publication Title:	EUROPEAN JOURNAL OF MASS SPECTROMETRY
Publisher:	IM PUBLICATIONS
ISSN:	1469-0667
Date:	2001
Volume:	7
Number:	4-5
Number of Pages:	6
Page Range:	pp. 393-398
Publication Status:	Published
URI:	http://wrap.warwick.ac.uk/id/eprint/11377

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