1tf7
From Proteopedia
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Crystal Structure of Circadian Clock Protein KaiC
Overview
Circadian (daily) biological clocks express characteristics that are difficult to explain by known biochemical mechanisms, and will ultimately require characterizing the structures, functions, and interactions of their molecular components. KaiC is an essential circadian protein in cyanobacteria that forms the core of the KaiABC clock protein complex. We report the crystal structure of the KaiC homohexameric complex at 2.8 A resolution. The structure resembles a double doughnut with a central pore that is partially sealed at one end. The crystal structure reveals ATP binding, inter-subunit organization, a scaffold for Kai-protein complex formation, the location of critical KaiC mutations, and evolutionary relationships to other proteins. A key auto-phosphorylation site on KaiC (T432) is identified from the crystal structure, and mutation of this residue abolishes circadian rhythmicity. The crystal structure of KaiC will be essential for understanding this circadian clockwork and for establishing its links to global gene expression.
About this Structure
1TF7 is a Single protein structure of sequence from Synechococcus sp. with as ligand. Full crystallographic information is available from OCA.
Reference
Visualizing a circadian clock protein: crystal structure of KaiC and functional insights., Pattanayek R, Wang J, Mori T, Xu Y, Johnson CH, Egli M, Mol Cell. 2004 Aug 13;15(3):375-88. PMID:15304218
Page seeded by OCA on Thu Feb 21 15:12:55 2008
Categories: Single protein | Synechococcus sp. | Egli, M. | Johnson, C H. | Mori, T. | Pattanayek, R. | Wang, J. | Xu, Y. | ATP | Hexamer | Homohexamer
