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1z5p

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[[Image:1z5p.gif|left|200px]]
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{{STRUCTURE_1z5p| PDB=1z5p | SCENE= }}
{{STRUCTURE_1z5p| PDB=1z5p | SCENE= }}
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'''Crystal structure of MTA/AdoHcy nucleosidase with a ligand-free purine binding site'''
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===Crystal structure of MTA/AdoHcy nucleosidase with a ligand-free purine binding site===
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==Overview==
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MTA/AdoHcy nucleosidase (MTAN) irreversibly hydrolyzes the N9-C1' bond in the nucleosides, 5'-methylthioadenosine (MTA) and S-adenosylhomocysteine (AdoHcy) to form adenine and the corresponding thioribose. MTAN plays a vital role in metabolic pathways involving methionine recycling, biological methylation, polyamine biosynthesis, and quorum sensing. Crystal structures of a wild-type (WT) MTAN complexed with glycerol, and mutant-enzyme and mutant-product complexes have been determined at 2.0A, 2.0A, and 2.1A resolution, respectively. The WT MTAN-glycerol structure provides a purine-free model and in combination with the previously solved thioribose-free MTAN-ADE structure, we now have separate apo structures for both MTAN binding subsites. The purine and thioribose-free states reveal an extensive enzyme-immobilized water network in their respective binding subsites. The Asp197Asn MTAN-MTA and Glu12Gln MTAN-MTR.ADE structures are the first enzyme-substrate and enzyme-product complexes reported for MTAN, respectively. These structures provide representative snapshots along the reaction coordinate and allow insight into the conformational changes of the enzyme and the nucleoside substrate. A "catalytic movie" detailing substrate binding, catalysis, and product release is presented.
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{{ABSTRACT_PUBMED_16109423}}
==About this Structure==
==About this Structure==
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[[Category: Smith, G D.]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 17:12:13 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jul 28 20:29:14 2008''

Revision as of 17:29, 28 July 2008

Image:1z5p.png

Template:STRUCTURE 1z5p

Crystal structure of MTA/AdoHcy nucleosidase with a ligand-free purine binding site

Template:ABSTRACT PUBMED 16109423

About this Structure

1Z5P is a Single protein structure of sequence from Escherichia coli. Full crystallographic information is available from OCA.

Reference

Structural snapshots of MTA/AdoHcy nucleosidase along the reaction coordinate provide insights into enzyme and nucleoside flexibility during catalysis., Lee JE, Smith GD, Horvatin C, Huang DJ, Cornell KA, Riscoe MK, Howell PL, J Mol Biol. 2005 Sep 23;352(3):559-74. PMID:16109423

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