1du1
From Proteopedia
|
PEPTIDE FRAGMENT THR671-LEU690 OF THE RABBIT SKELETAL DIHYDROPYRIDINE RECEPTOR
Overview
The solution structures of three related peptides (A1, A2, and A9), corresponding to the Thr(671)-Leu(690) region of the skeletal muscle, dihydropyridine receptor II-III loop have been investigated using nuclear, magnetic resonance spectroscopy. Peptide A1, the native sequence, is less, effective in activating ryanodine receptor calcium release channels than, A2 (Ser(687) to Ala substitution). Peptide A9, Arg(681)-Ser(687), does not, activate ryanodine receptors. A1 and A2 are helical from their N terminus, to Lys(685) but are generally unstructured from Lys(685) to the C, terminus. The basic residues Arg(681)-Lys(685), essential for A1, activation of ryanodine receptors, are located at the C-terminal end of, the alpha-helix. Peptide A9 was found to be unstructured. Differences, between A1 and A2 were observed in the C-terminal end of the helix, (residues 681-685), which was less ordered in A1, and in the C-terminal, region of the peptide, which exhibited greater flexibility in A1., Predicted low energy models suggest that an electrostatic interaction, between the hydroxyl oxygen of Ser(687) and the guanidino moiety of, Arg(683) is lost with the Ser(687)Ala substitution. The results show that, the more structured peptides are more effective in activating ryanodine, receptors.
About this Structure
1DU1 is a Single protein structure of sequence from [1]. Full crystallographic information is available from OCA.
Reference
A structural requirement for activation of skeletal ryanodine receptors by peptides of the dihydropyridine receptor II-III loop., Casarotto MG, Gibson F, Pace SM, Curtis SM, Mulcair M, Dulhunty AF, J Biol Chem. 2000 Apr 21;275(16):11631-7. PMID:10766780
Page seeded by OCA on Tue Nov 20 13:34:54 2007
