2csd
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(New page: 200px<br /><applet load="2csd" size="350" color="white" frame="true" align="right" spinBox="true" caption="2csd, resolution 2.90Å" /> '''Crystal structure of...)
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Revision as of 16:47, 29 January 2008
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Crystal structure of Topoisomerase V (61 kDa fragment)
Overview
Topoisomerases are involved in controlling and maintaining the topology of, DNA and are present in all kingdoms of life. Unlike all other types of, topoisomerases, similar type IB enzymes have only been identified in, bacteria and eukarya. The only putative type IB topoisomerase in archaea, is represented by Methanopyrus kandleri topoisomerase V. Despite several, common functional characteristics, topoisomerase V shows no sequence, similarity to other members of the same type. The structure of the 61 kDa, N-terminal fragment of topoisomerase V reveals no structural similarity to, other topoisomerases. Furthermore, the structure of the active site region, is different, suggesting no conservation in the cleavage and religation, mechanism. Additionally, the active site is buried, indicating the need of, a conformational change for activity. The presence of a topoisomerase in, archaea with a unique structure suggests the evolution of a separate, mechanism to alter DNA.
About this Structure
2CSD is a Single protein structure of sequence from Methanopyrus kandleri. Full crystallographic information is available from OCA.
Reference
Structure of the N-terminal fragment of topoisomerase V reveals a new family of topoisomerases., Taneja B, Patel A, Slesarev A, Mondragon A, EMBO J. 2006 Jan 25;25(2):398-408. Epub 2006 Jan 5. PMID:16395333
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