1zq8
From Proteopedia
(New page: 200px<br /><applet load="1zq8" size="450" color="white" frame="true" align="right" spinBox="true" caption="1zq8, resolution 1.90Å" /> '''Crystal Structure of...) |
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| - | [[Image:1zq8.gif|left|200px]]<br /><applet load="1zq8" size=" | + | [[Image:1zq8.gif|left|200px]]<br /><applet load="1zq8" size="350" color="white" frame="true" align="right" spinBox="true" |
caption="1zq8, resolution 1.90Å" /> | caption="1zq8, resolution 1.90Å" /> | ||
'''Crystal Structure of N-acetyl-L-ornithine transcarbamylase complexed with carbamoyl phosphate and N-acetyl-L-norvaline'''<br /> | '''Crystal Structure of N-acetyl-L-ornithine transcarbamylase complexed with carbamoyl phosphate and N-acetyl-L-norvaline'''<br /> | ||
==Overview== | ==Overview== | ||
| - | N-acetyl-L-ornithine transcarbamoylase (AOTCase) is a new member of the | + | N-acetyl-L-ornithine transcarbamoylase (AOTCase) is a new member of the transcarbamoylase superfamily that is essential for arginine biosynthesis in several eubacteria. We report here crystal structures of the binary complexes of AOTCase with its substrates, carbamoyl phosphate (CP) or N-acetyl-L-ornithine (AORN), and the ternary complex with CP and N-acetyl-L-norvaline. Comparison of these structures demonstrates that the substrate-binding mechanism of this novel transcarbamoylase is different from those of aspartate and ornithine transcarbamoylases, both of which show ordered substrate binding with large domain movements. CP and AORN bind to AOTCase independently, and the main conformational change upon substrate binding is ordering of the 80's loop, with a small domain closure around the active site and little movement of the 240's loop. The structures of the complexes provide insight into the mode of substrate binding and the mechanism of the transcarbamoylation reaction. |
==About this Structure== | ==About this Structure== | ||
| - | 1ZQ8 is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Xanthomonas_campestris Xanthomonas campestris] with SO4, AN0, CP and GOL as [http://en.wikipedia.org/wiki/ligands ligands]. Active as [http://en.wikipedia.org/wiki/Ornithine_carbamoyltransferase Ornithine carbamoyltransferase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=2.1.3.3 2.1.3.3] Full crystallographic information is available from [http:// | + | 1ZQ8 is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Xanthomonas_campestris Xanthomonas campestris] with <scene name='pdbligand=SO4:'>SO4</scene>, <scene name='pdbligand=AN0:'>AN0</scene>, <scene name='pdbligand=CP:'>CP</scene> and <scene name='pdbligand=GOL:'>GOL</scene> as [http://en.wikipedia.org/wiki/ligands ligands]. Active as [http://en.wikipedia.org/wiki/Ornithine_carbamoyltransferase Ornithine carbamoyltransferase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=2.1.3.3 2.1.3.3] Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1ZQ8 OCA]. |
==Reference== | ==Reference== | ||
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[[Category: Single protein]] | [[Category: Single protein]] | ||
[[Category: Xanthomonas campestris]] | [[Category: Xanthomonas campestris]] | ||
| - | [[Category: Allewell, N | + | [[Category: Allewell, N M.]] |
| - | [[Category: Malamy, M | + | [[Category: Malamy, M H.]] |
[[Category: Morizono, H.]] | [[Category: Morizono, H.]] | ||
[[Category: Roth, L.]] | [[Category: Roth, L.]] | ||
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[[Category: alpha/beta two-domain]] | [[Category: alpha/beta two-domain]] | ||
| - | ''Page seeded by [http:// | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 16:18:01 2008'' |
Revision as of 14:18, 21 February 2008
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Crystal Structure of N-acetyl-L-ornithine transcarbamylase complexed with carbamoyl phosphate and N-acetyl-L-norvaline
Overview
N-acetyl-L-ornithine transcarbamoylase (AOTCase) is a new member of the transcarbamoylase superfamily that is essential for arginine biosynthesis in several eubacteria. We report here crystal structures of the binary complexes of AOTCase with its substrates, carbamoyl phosphate (CP) or N-acetyl-L-ornithine (AORN), and the ternary complex with CP and N-acetyl-L-norvaline. Comparison of these structures demonstrates that the substrate-binding mechanism of this novel transcarbamoylase is different from those of aspartate and ornithine transcarbamoylases, both of which show ordered substrate binding with large domain movements. CP and AORN bind to AOTCase independently, and the main conformational change upon substrate binding is ordering of the 80's loop, with a small domain closure around the active site and little movement of the 240's loop. The structures of the complexes provide insight into the mode of substrate binding and the mechanism of the transcarbamoylation reaction.
About this Structure
1ZQ8 is a Single protein structure of sequence from Xanthomonas campestris with , , and as ligands. Active as Ornithine carbamoyltransferase, with EC number 2.1.3.3 Full crystallographic information is available from OCA.
Reference
Structures of N-acetylornithine transcarbamoylase from Xanthomonas campestris complexed with substrates and substrate analogs imply mechanisms for substrate binding and catalysis., Shi D, Yu X, Roth L, Morizono H, Tuchman M, Allewell NM, Proteins. 2006 Aug 1;64(2):532-42. PMID:16741992
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