1VRK

THE 1.9 ANGSTROM STRUCTURE OF E84K-CALMODULIN RS20 PEPTIDE COMPLEX

Summary for 1VRK

• Entry DOI: 10.2210/pdb1vrk/pdb
• Descriptor: CALMODULIN, RS20, CALCIUM ION, ... (5 entities in total)
• Functional Keywords: calmodulin, calcium binding, helix-loop-helix, signalling, complex(calcium-binding protein-peptide), complex(calcium-binding protein-peptide) complex, complex(calcium-binding protein/peptide)
• Biological source: synthetic construct
• Total number of polymer chains: 2
• Total formula weight: 19189.39

Authors

Weigand, S.,Anderson, W.F. (deposition date: 1997-09-24, release date: 1999-04-27, Last modification date: 2024-10-30)

Primary citation

Mirzoeva, S.,Weigand, S.,Lukas, T.J.,Shuvalova, L.,Anderson, W.F.,Watterson, D.M.
Analysis of the functional coupling between calmodulin's calcium binding and peptide recognition properties.
Biochemistry, 38:3936-3947, 1999

PubMed Abstract: The enhancement of calmodulin's (CaM) calcium binding activity by an enzyme or a recognition site peptide and its diminution by key point mutations at the protein recognition interface (e.g., E84K-CaM), which is more than 20 A away from the nearest calcium ligation structure, can be described by an expanded version of the Adair-Klotz equation for multiligand binding. The expanded equation can accurately describe the calcium binding events and their variable linkage to protein recognition events can be extended to other CaM-regulated enzymes and can potentially be applied to a diverse array of ligand binding systems with allosteric regulation of ligand binding, whether by other ligands or protein interaction. The 1.9 A resolution X-ray crystallographic structure of the complex between E84K-CaM and RS20 peptide, the CaM recognition site peptide from vertebrate smooth muscle and nonmuscle forms of myosin light chain kinase, provides insight into the structural basis of the functional communication between CaM's calcium ligation structures and protein recognition surfaces. The structure reveals that the complex adapts to the effect of the functional mutation by discrete adjustments in the helix that contains E84. This helix is on the amino-terminal side of the helix-loop-helix structural motif that is the first to be occupied in CaM's calcium binding mechanism. The results reported here are consistent with a sequential and cooperative model of CaM's calcium binding activity in which the two globular and flexible central helix domains are functionally linked, and provide insight into how CaM's calcium binding activity and peptide recognition properties are functionally coupled.

PubMed: 10194305
DOI: 10.1021/bi9821263

Experimental method

X-RAY DIFFRACTION (1.9 Å)