1r0c: Difference between revisions

Revision as of 14:29, 27 July 2008

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File:1r0c.png

Template:STRUCTURE 1r0c

Products in the T State of Aspartate Transcarbamylase: Crystal Structure of the Phosphate and N-carbamyl-L-aspartate Ligated EnzymeProducts in the T State of Aspartate Transcarbamylase: Crystal Structure of the Phosphate and N-carbamyl-L-aspartate Ligated Enzyme

Template:ABSTRACT PUBMED 15157076

About this StructureAbout this Structure

1R0C is a Protein complex structure of sequences from Escherichia coli. Full crystallographic information is available from OCA.

ReferenceReference

Products in the T-state of aspartate transcarbamylase: crystal structure of the phosphate and N-carbamyl-L-aspartate ligated enzyme., Huang J, Lipscomb WN, Biochemistry. 2004 Jun 1;43(21):6422-6. PMID:15157076

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-'''Products in the T State of Aspartate Transcarbamylase: Crystal Structure of the Phosphate and N-carbamyl-L-aspartate Ligated Enzyme'''
+===Products in the T State of Aspartate Transcarbamylase: Crystal Structure of the Phosphate and N-carbamyl-L-aspartate Ligated Enzyme===
-==Overview==
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-The structure of aspartate transcarbamylase of Escherichia coli ligated to products (phosphate and N-carbamyl-l-aspartate) has been determined at 2.37 A resolution (R-factor = 0.23, R(free) = 0.27). Results might indicate a product release mode, rather than close analogues to the transition state like those found in our earlier studies of other ligands (N-phosphonacetyl-L-aspartate, carbamyl phosphate plus malonate, phosphonoacetamide plus malonate, or citrate plus phosphate). Ordered product release, first carbamylaspartate (CLA) and then phosphate, might be facilitated by a 4 A movement of phosphate from the substrate-analogue position to the product (phosphate) binding position, and by a somewhat similar release movement of the other product (CLA) relative to its analogue (citrate). This movement is consistent with earlier studies of binding of either pyrophosphate or phosphate alone [Honzatko, R. B., and Lipscomb, W. N. (1982) J. Mol. Biol. 160, 265-286].
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