A Novel Trans Conformation of Ligand-Free Calmodulin

作者：Kumar Veerendra; Chichili Vishnu Priyanka Reddy; Tang Xuhua; Sivaraman J^*

来源：PLos One, 2013, 8(1): e54834.

DOI：10.1371/journal.pone.0054834

Calmodulin (CaM) is a highly conserved eukaryotic protein that binds specifically to more than 100 target proteins in response to calcium (Ca2+) signal. CaM adopts a considerable degree of structural plasticity to accomplish this physiological role; however, the nature and extent of this plasticity remain to be fully understood. Here, we report the crystal structure of a novel trans conformation of ligand-free CaM where the relative disposition of two lobes of CaM is different, a conformation to-date not reported. While no major structural changes were observed in the independent N- and C-lobes as compared with previously reported structures of Ca2+/CaM, the central helix was tilted by similar to 90 degrees at Arg75. This is the first crystal structure of CaM to show a drastic conformational change in the central helix, and reveals one of several possible conformations of CaM to engage with its binding partner.

• 出版日期2013-1-29