1kdp: Difference between revisions
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[[Image: | ==CYTIDINE MONOPHOSPHATE KINASE FROM E. COLI IN COMPLEX WITH 2'-DEOXY-CYTIDINE MONOPHOSPHATE== | ||
<StructureSection load='1kdp' size='340' side='right' caption='[[1kdp]], [[Resolution|resolution]] 2.30Å' scene=''> | |||
== Structural highlights == | |||
<table><tr><td colspan='2'>[[1kdp]] is a 2 chain structure with sequence from [http://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1KDP OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1KDP FirstGlance]. <br> | |||
</td></tr><tr><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=SO4:SULFATE+ION'>SO4</scene><br> | |||
<tr><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[1kdo|1kdo]], [[1kdr|1kdr]], [[1kdt|1kdt]]</td></tr> | |||
<tr><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">cmk ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=562 Escherichia coli])</td></tr> | |||
<tr><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/Cytidylate_kinase Cytidylate kinase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=2.7.4.14 2.7.4.14] </span></td></tr> | |||
<tr><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1kdp FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1kdp OCA], [http://www.rcsb.org/pdb/explore.do?structureId=1kdp RCSB], [http://www.ebi.ac.uk/pdbsum/1kdp PDBsum]</span></td></tr> | |||
<table> | |||
== Evolutionary Conservation == | |||
[[Image:Consurf_key_small.gif|200px|right]] | |||
Check<jmol> | |||
<jmolCheckbox> | |||
<scriptWhenChecked>select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/kd/1kdp_consurf.spt"</scriptWhenChecked> | |||
<scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked> | |||
<text>to colour the structure by Evolutionary Conservation</text> | |||
</jmolCheckbox> | |||
</jmol>, as determined by [http://consurfdb.tau.ac.il/ ConSurfDB]. You may read the [[Conservation%2C_Evolutionary|explanation]] of the method and the full data available from [http://bental.tau.ac.il/new_ConSurfDB/chain_selection.php?pdb_ID=2ata ConSurf]. | |||
<div style="clear:both"></div> | |||
<div style="background-color:#fffaf0;"> | |||
== Publication Abstract from PubMed == | |||
Bacterial cytidine monophosphate (CMP) kinases are characterised by an insert enlarging their CMP binding domain, and by their particular substrate specificity. Thus, both CMP and 2'-deoxy-CMP (dCMP) are good phosphate acceptors for the CMP kinase from Escherichia coli (E. coli CMPK), whereas eukaryotic UMP/CMP kinases phosphorylate the deoxynucleotides with very low efficiency. Four crystal structures of E. coli CMPK complexed with nucleoside monophosphates differing in their sugar moiety were solved. Both structures with CMP or dCMP show interactions with the pentose that were not described so far. These interactions are lost with the poorer substrates AraCMP and 2',3'-dideoxy-CMP. Comparison of all four structures shows that the pentose hydroxyls are involved in ligand-induced movements of enzyme domains. It also gives a structural basis of the mechanism by which either ribose or deoxyribose can be accommodated. In parallel, for the four nucleotides the kinetic results of the wild-type enzyme and of three structure-based variants are presented. The phosphorylation rate is significantly decreased when either of the two pentose interacting residues is mutated. One of these is an arginine that is highly conserved in all known nucleoside monophosphate kinases. In contrast, the other residue, Asp185, is typical of bacterial CMP kinases. It interacts with Ser101, the only residue conserved in all CMP binding domain inserts. Mutating Ser101 reduces CMP phosphorylation only moderately, but dramatically reduces dCMP phosphorylation. This is the first experimental evidence of a catalytic role involving the characteristic insert of bacterial CMP kinases. Furthermore, this role concerns only dCMP phosphorylation, a feature of this family of enzymes. | |||
Sugar specificity of bacterial CMP kinases as revealed by crystal structures and mutagenesis of Escherichia coli enzyme.,Bertrand T, Briozzo P, Assairi L, Ofiteru A, Bucurenci N, Munier-Lehmann H, Golinelli-Pimpaneau B, Barzu O, Gilles AM J Mol Biol. 2002 Feb 1;315(5):1099-110. PMID:11827479<ref>PMID:11827479</ref> | |||
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | |||
</div> | |||
==See Also== | |||
*[[Cytidine monophosphate kinase|Cytidine monophosphate kinase]] | |||
== | == References == | ||
[[ | <references/> | ||
__TOC__ | |||
== | </StructureSection> | ||
< | |||
[[Category: Cytidylate kinase]] | [[Category: Cytidylate kinase]] | ||
[[Category: Escherichia coli]] | [[Category: Escherichia coli]] | ||
Revision as of 11:29, 28 September 2014
CYTIDINE MONOPHOSPHATE KINASE FROM E. COLI IN COMPLEX WITH 2'-DEOXY-CYTIDINE MONOPHOSPHATECYTIDINE MONOPHOSPHATE KINASE FROM E. COLI IN COMPLEX WITH 2'-DEOXY-CYTIDINE MONOPHOSPHATE
Structural highlights
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 PubMedBacterial cytidine monophosphate (CMP) kinases are characterised by an insert enlarging their CMP binding domain, and by their particular substrate specificity. Thus, both CMP and 2'-deoxy-CMP (dCMP) are good phosphate acceptors for the CMP kinase from Escherichia coli (E. coli CMPK), whereas eukaryotic UMP/CMP kinases phosphorylate the deoxynucleotides with very low efficiency. Four crystal structures of E. coli CMPK complexed with nucleoside monophosphates differing in their sugar moiety were solved. Both structures with CMP or dCMP show interactions with the pentose that were not described so far. These interactions are lost with the poorer substrates AraCMP and 2',3'-dideoxy-CMP. Comparison of all four structures shows that the pentose hydroxyls are involved in ligand-induced movements of enzyme domains. It also gives a structural basis of the mechanism by which either ribose or deoxyribose can be accommodated. In parallel, for the four nucleotides the kinetic results of the wild-type enzyme and of three structure-based variants are presented. The phosphorylation rate is significantly decreased when either of the two pentose interacting residues is mutated. One of these is an arginine that is highly conserved in all known nucleoside monophosphate kinases. In contrast, the other residue, Asp185, is typical of bacterial CMP kinases. It interacts with Ser101, the only residue conserved in all CMP binding domain inserts. Mutating Ser101 reduces CMP phosphorylation only moderately, but dramatically reduces dCMP phosphorylation. This is the first experimental evidence of a catalytic role involving the characteristic insert of bacterial CMP kinases. Furthermore, this role concerns only dCMP phosphorylation, a feature of this family of enzymes. Sugar specificity of bacterial CMP kinases as revealed by crystal structures and mutagenesis of Escherichia coli enzyme.,Bertrand T, Briozzo P, Assairi L, Ofiteru A, Bucurenci N, Munier-Lehmann H, Golinelli-Pimpaneau B, Barzu O, Gilles AM J Mol Biol. 2002 Feb 1;315(5):1099-110. PMID:11827479[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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