Primary Citation of Related Structures:   1PRW
PubMed Abstract: 
Calmodulin has been a subject of intense scrutiny since its discovery because of its unusual properties in regulating the functions of about 100 diverse target enzymes and structural proteins. The original and to date only crystal conformation of native eukaryotic Ca(2+)-calmodulin (Ca(2+)-CaM) is a very extended molecule with two widely separated globular domains linked by an exposed long helix ...
Calmodulin has been a subject of intense scrutiny since its discovery because of its unusual properties in regulating the functions of about 100 diverse target enzymes and structural proteins. The original and to date only crystal conformation of native eukaryotic Ca(2+)-calmodulin (Ca(2+)-CaM) is a very extended molecule with two widely separated globular domains linked by an exposed long helix. Here we report the 1.7 A X-ray structure of a new native Ca(2+)-CaM that is in a compact ellipsoidal conformation and shows a sharp bend in the linker helix and a more contracted N-terminal domain. This conformation may offer advantages for recognition of kinase-type calmodulin targets or small organic molecule drugs.
Related Citations: 
Man bites dog Meador, W.E., Quiocho, F.A. (2002) Nat Struct Biol 9: 156
X-ray analysis reveals conformational adaptation of the linker in functional calmodulin mutants Meador, W.E., George, S.E., Means, A.R., Quiocho, F.A. (1995) Nat Struct Biol 2: 943
Modulation of calmodulin plasticity in molecular recognition on the basis of x-ray structures Meador, W.E., Means, A.R., Quiocho, F.A. (1993) Science 262: 1718
Target enzyme recognition by calmodulin: 2.4 A structure of a calmodulin-peptide complex Meador, W.E., Means, A.R., Quiocho, F.A. (1992) Science 257: 1251
Calmodulin structure refined at 1.7 A resolution Chattopadhyaya, R., Meador, W.E., Means, A.R., Quiocho, F.A. (1992) J Mol Biol 228: 1177
Organizational Affiliation: 
Howard Hughes Medical Institute, Baylor College of Medicine, Houston, TX 77030, USA.