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| | <StructureSection load='1sv1' size='340' side='right' caption='[[1sv1]], [[NMR_Ensembles_of_Models | 25 NMR models]]' scene=''> | | <StructureSection load='1sv1' size='340' side='right' caption='[[1sv1]], [[NMR_Ensembles_of_Models | 25 NMR models]]' scene=''> |
| | == Structural highlights == | | == Structural highlights == |
| - | <table><tr><td colspan='2'>[[1sv1]] is a 4 chain structure with sequence from [http://en.wikipedia.org/wiki/Thermosynechococcus_elongatus_bp-1 Thermosynechococcus elongatus bp-1]. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1SV1 OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1SV1 FirstGlance]. <br> | + | <table><tr><td colspan='2'>[[1sv1]] is a 4 chain structure with sequence from [http://en.wikipedia.org/wiki/Theeb Theeb]. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1SV1 OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1SV1 FirstGlance]. <br> |
| | </td></tr><tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[1q6b|1q6b]], [[1suy|1suy]]</td></tr> | | </td></tr><tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[1q6b|1q6b]], [[1suy|1suy]]</td></tr> |
| - | <tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">KaiA ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=197221 Thermosynechococcus elongatus BP-1]), KaiC ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=197221 Thermosynechococcus elongatus BP-1])</td></tr> | + | <tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">KaiA ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=197221 THEEB]), KaiC ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=197221 THEEB])</td></tr> |
| - | <tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1sv1 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1sv1 OCA], [http://www.rcsb.org/pdb/explore.do?structureId=1sv1 RCSB], [http://www.ebi.ac.uk/pdbsum/1sv1 PDBsum]</span></td></tr> | + | <tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1sv1 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1sv1 OCA], [http://pdbe.org/1sv1 PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=1sv1 RCSB], [http://www.ebi.ac.uk/pdbsum/1sv1 PDBsum]</span></td></tr> |
| | </table> | | </table> |
| | + | {{Large structure}} |
| | == Function == | | == Function == |
| - | [[http://www.uniprot.org/uniprot/KAIA_SYNEL KAIA_SYNEL]] Component of the KaiABC clock protein complex, which constitutes the main circadian regulator in cyanobacteria. The KaiABC complex may act as a promoter-nonspecific transcription regulator that represses transcription, possibly by acting on the state of chromosome compaction. In the complex, it enhances the phosphorylation status of KaiC. In contrast, the presence of KaiB in the complex decreases the phosphorylation status of KaiC, suggesting that KaiB acts by antagonizing the interaction between KaiA and KaiC. A KaiA dimer is sufficient to enhance KaiC hexamer phosphorylation. [[http://www.uniprot.org/uniprot/KAIC_THEEB KAIC_THEEB]] Core component of the KaiABC clock protein complex, which constitutes the main circadian regulator in cyanobacteria. Binds to DNA. The KaiABC complex may act as a promoter-nonspecific transcription regulator that represses transcription, possibly by acting on the state of chromosome compaction (By similarity).[HAMAP-Rule:MF_01836] | + | [[http://www.uniprot.org/uniprot/KAIA_THEEB KAIA_THEEB]] Component of the KaiABC clock protein complex, which constitutes the main circadian regulator in cyanobacteria. The KaiABC complex may act as a promoter-nonspecific transcription regulator that represses transcription, possibly by acting on the state of chromosome compaction. In the complex, it enhances the phosphorylation status of KaiC. In contrast, the presence of KaiB in the complex decreases the phosphorylation status of KaiC, suggesting that KaiB acts by antagonizing the interaction between KaiA and KaiC. A KaiA dimer is sufficient to enhance KaiC hexamer phosphorylation. [[http://www.uniprot.org/uniprot/KAIC_THEEB KAIC_THEEB]] Core component of the KaiABC clock protein complex, which constitutes the main circadian regulator in cyanobacteria. Binds to DNA. The KaiABC complex may act as a promoter-nonspecific transcription regulator that represses transcription, possibly by acting on the state of chromosome compaction (By similarity).[HAMAP-Rule:MF_01836] |
| | == Evolutionary Conservation == | | == Evolutionary Conservation == |
| | [[Image:Consurf_key_small.gif|200px|right]] | | [[Image:Consurf_key_small.gif|200px|right]] |
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| | From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | | From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> |
| | </div> | | </div> |
| | + | <div class="pdbe-citations 1sv1" style="background-color:#fffaf0;"></div> |
| | | | |
| | ==See Also== | | ==See Also== |
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| | __TOC__ | | __TOC__ |
| | </StructureSection> | | </StructureSection> |
| - | [[Category: Thermosynechococcus elongatus bp-1]] | + | [[Category: Theeb]] |
| | [[Category: LiWang, A C]] | | [[Category: LiWang, A C]] |
| | [[Category: Vakonakis, I]] | | [[Category: Vakonakis, I]] |
| Structural highlights
Warning: this is a large structure, and loading might take a long time or not happen at all.
Function
[KAIA_THEEB] Component of the KaiABC clock protein complex, which constitutes the main circadian regulator in cyanobacteria. The KaiABC complex may act as a promoter-nonspecific transcription regulator that represses transcription, possibly by acting on the state of chromosome compaction. In the complex, it enhances the phosphorylation status of KaiC. In contrast, the presence of KaiB in the complex decreases the phosphorylation status of KaiC, suggesting that KaiB acts by antagonizing the interaction between KaiA and KaiC. A KaiA dimer is sufficient to enhance KaiC hexamer phosphorylation. [KAIC_THEEB] Core component of the KaiABC clock protein complex, which constitutes the main circadian regulator in cyanobacteria. Binds to DNA. The KaiABC complex may act as a promoter-nonspecific transcription regulator that represses transcription, possibly by acting on the state of chromosome compaction (By similarity).[HAMAP-Rule:MF_01836]
Evolutionary Conservation
Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf.
Publication Abstract from PubMed
Circadian clocks are widespread endogenous mechanisms that control the temporal pattern of diverse biological processes, including gene transcription. KaiA is the positive element of the cyanobacterial clock because KaiA overexpression elevates transcription levels of clock components. Recently, we showed that the structure of KaiA is that of a domain-swapped homodimer. The N-terminal domain is a pseudo-receiver; thus, it is likely to be involved in signal transduction in the clock-resetting pathway. The C-terminal domain of KaiA is structurally novel and enhances the KaiC autokinase activity directly. Here, we report the NMR structure of the C-terminal domain of KaiA (ThKaiA180C) in complex with a KaiC-derived peptide from the cyanobacterium Thermosynechococcus elongatus BP-1. The protein-peptide interface is revealed to be different from a model that was proposed earlier, is stabilized by a combination of hydrophobic and electrostatic interactions, and includes many residues known to produce a circadian-period phenotype upon substitution. Although the structure of the monomeric subunit of ThKaiA180C is largely unchanged upon peptide binding, the intersubunit dimerization angle changes. It is proposed that modulation of the C-terminal KaiA domain dimerization angle regulates KaiA-KaiC interactions.
Structure of the C-terminal domain of the clock protein KaiA in complex with a KaiC-derived peptide: implications for KaiC regulation.,Vakonakis I, LiWang AC Proc Natl Acad Sci U S A. 2004 Jul 27;101(30):10925-30. Epub 2004 Jul 15. PMID:15256595[1]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
See Also
References
- ↑ Vakonakis I, LiWang AC. Structure of the C-terminal domain of the clock protein KaiA in complex with a KaiC-derived peptide: implications for KaiC regulation. Proc Natl Acad Sci U S A. 2004 Jul 27;101(30):10925-30. Epub 2004 Jul 15. PMID:15256595 doi:10.1073/pnas.0403037101
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