1ujq: Difference between revisions
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New page: left|200px<br /><applet load="1ujq" size="450" color="white" frame="true" align="right" spinBox="true" caption="1ujq, resolution 2.10Å" /> '''Crystal structure of... |
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[[Image:1ujq.jpg|left|200px]]<br /><applet load="1ujq" size=" | [[Image:1ujq.jpg|left|200px]]<br /><applet load="1ujq" size="350" color="white" frame="true" align="right" spinBox="true" | ||
caption="1ujq, resolution 2.10Å" /> | caption="1ujq, resolution 2.10Å" /> | ||
'''Crystal structure of 2-methylisocitrate lyase (PrpB) from Salmonella enterica serovar typhimurium'''<br /> | '''Crystal structure of 2-methylisocitrate lyase (PrpB) from Salmonella enterica serovar typhimurium'''<br /> | ||
==Overview== | ==Overview== | ||
Propionate metabolism in Salmonella typhimurium occurs via 2-methylcitric | Propionate metabolism in Salmonella typhimurium occurs via 2-methylcitric acid cycle. The last step of this cycle, the cleavage of 2-methylisocitrate to succinate and pyruvate, is catalysed by 2-methylisocitrate lyase (PrpB). Here we report the X-ray crystal structure of the native and the pyruvate/Mg(2+) bound PrpB from S. typhimurium, determined at 2.1 and 2.3A, respectively. The structure closely resembles that of the Escherichia coli enzyme. Unlike the E. coli PrpB, Mg(2+) could not be located in the native Salmonella PrpB. Only in pyruvate bound PrpB structure, Mg(2+) was found coordinated with pyruvate. Binding of pyruvate to PrpB seems to induce movement of the Mg(2+) by 2.5A from its position found in E. coli native PrpB. In both the native enzyme and pyruvate/Mg(2+) bound forms, the active site loop is completely disordered. Examination of the pocket in which pyruvate and glyoxalate bind to 2-methylisocitrate lyase and isocitrate lyase, respectively, reveals plausible rationale for different substrate specificities of these two enzymes. Structural similarities in substrate and metal atom binding site as well as presence of similar residues in the active site suggest possible similarities in the reaction mechanism. | ||
==About this Structure== | ==About this Structure== | ||
1UJQ is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Salmonella_enterica_subsp._enterica_serovar_typhimurium Salmonella enterica subsp. enterica serovar typhimurium]. Active as [http://en.wikipedia.org/wiki/Methylisocitrate_lyase Methylisocitrate lyase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=4.1.3.30 4.1.3.30] Full crystallographic information is available from [http:// | 1UJQ is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Salmonella_enterica_subsp._enterica_serovar_typhimurium Salmonella enterica subsp. enterica serovar typhimurium]. Active as [http://en.wikipedia.org/wiki/Methylisocitrate_lyase Methylisocitrate lyase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=4.1.3.30 4.1.3.30] Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1UJQ OCA]. | ||
==Reference== | ==Reference== | ||
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[[Category: Salmonella enterica subsp. enterica serovar typhimurium]] | [[Category: Salmonella enterica subsp. enterica serovar typhimurium]] | ||
[[Category: Single protein]] | [[Category: Single protein]] | ||
[[Category: Murthy, M | [[Category: Murthy, M R.N.]] | ||
[[Category: Simanshu, D | [[Category: Simanshu, D K.]] | ||
[[Category: lyase]] | [[Category: lyase]] | ||
[[Category: methylcitrate cycle]] | [[Category: methylcitrate cycle]] | ||
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[[Category: tim-2 barrel]] | [[Category: tim-2 barrel]] | ||
''Page seeded by [http:// | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 15:25:15 2008'' | ||
