Calmodulin-RS20-Ca-4 complex in the gas phase: electrospray ionisation and Fourier transform ion cyclotron resonance
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 1469-0667Full text not available from this repository.
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|
|Number of Pages:||6|
|Page Range:||pp. 393-398|
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