4TLE
Crystal structure of N-terminal C1 domain of KaiC
Summary for 4TLE
| Entry DOI | 10.2210/pdb4tle/pdb |
| Related | 4TL6 4TL7 4TL8 4TL9 4TLA 4TLB 4TLC 4TLD |
| Descriptor | Circadian clock protein kinase KaiC, MAGNESIUM ION, CHLORIDE ION, ... (5 entities in total) |
| Functional Keywords | serine/threonine-protein kinase, transferase |
| Biological source | Synechococcus elongatus PCC 7942 |
| Total number of polymer chains | 6 |
| Total formula weight | 173869.66 |
| Authors | Abe, J.,Hiyama, T.B.,Mukaiyama, A.,Son, S.,Akiyama, S. (deposition date: 2014-05-29, release date: 2015-07-01, Last modification date: 2024-03-20) |
| Primary citation | Abe, J.,Hiyama, T.B.,Mukaiyama, A.,Son, S.,Mori, T.,Saito, S.,Osako, M.,Wolanin, J.,Yamashita, E.,Kondo, T.,Akiyama, S. Atomic-scale origins of slowness in the cyanobacterial circadian clock Science, 349:312-316, 2015 Cited by PubMed Abstract: Circadian clocks generate slow and ordered cellular dynamics but consist of fast-moving bio-macromolecules; consequently, the origins of the overall slowness remain unclear. We identified the adenosine triphosphate (ATP) catalytic region [adenosine triphosphatase (ATPase)] in the amino-terminal half of the clock protein KaiC as the minimal pacemaker that controls the in vivo frequency of the cyanobacterial clock. Crystal structures of the ATPase revealed that the slowness of this ATPase arises from sequestration of a lytic water molecule in an unfavorable position and coupling of ATP hydrolysis to a peptide isomerization with high activation energy. The slow ATPase is coupled with another ATPase catalyzing autodephosphorylation in the carboxyl-terminal half of KaiC, yielding the circadian response frequency of intermolecular interactions with other clock-related proteins that influences the transcription and translation cycle. PubMed: 26113637DOI: 10.1126/science.1261040 PDB entries with the same primary citation |
| Experimental method | X-RAY DIFFRACTION (1.936 Å) |
Structure validation
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