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Default Conformation of the cytoplasmic domain of phospholamban by NMR and CD.

Conformation of the cytoplasmic domain of phospholamban by NMR and CD.

Related Articles Conformation of the cytoplasmic domain of phospholamban by NMR and CD.

Mol Membr Biol. 1994 Oct-Dec;11(4):263-9

Authors: Hubbard JA, MacLachlan LK, Meenan E, Salter CJ, Reid DG, Lahouratate P, Humphries J, Stevens N, Bell D, Neville WA

Nuclear magnetic resonance (NMR) and circular dichroism (CD) spectroscopy have been used to characterize the conformation of the putative cytoplasmic domain of phospholamban (PLB), an oligomeric membrane-bound protein which regulates the activity of the cardiac sarcoplasmic reticulum Ca(2+)-dependent ATPase. In aqueous solution the 25-residue peptide adopts a number of rapidly interconverting conformers with no secondary structural type obviously predominating. However, in trifluoroethanol (TFE) the conformation, while still highly dynamic, is characterized by a high proportion of helical structures. Evidence for this is provided by alpha CH chemical shifts and low NH chemical shift temperature coefficients, small NH-alpha CH intraresidue scalar coupling constants, a substantial number of distinctive interresidue nuclear Overhauser effects (NOEs) [dNN(i, i + 1), d alpha N(i, i + 3), d alpha beta(i, i + 3) and d alpha N(i, i + 4)] and characteristic CD bands at 190 (positive), 206 (negative) and 222 nm (negative). The helicity is interrupted around Pro-21. The activity of PLB is regulated by phosphorylation at either Ser-16 or Thr-17. CD shows that phosphorylation at Ser-16 by the cAMP-activated protein kinase causes about an 11% decrease in alpha-helical content in TFE.

PMID: 7711836 [PubMed - indexed for MEDLINE]



Source: PubMed
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