1v2d

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{{STRUCTURE_1v2d| PDB=1v2d | SCENE= }}
{{STRUCTURE_1v2d| PDB=1v2d | SCENE= }}
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'''Crystal Structure of T.th HB8 Glutamine Aminotransferase'''
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===Crystal Structure of T.th HB8 Glutamine Aminotransferase===
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==Overview==
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The following three-dimensional structures of three forms of glutamine:phenylpyruvate aminotransferase from Thermus thermophilus HB8 have been determined and represent the first x-ray analysis of the enzyme: the unliganded pyridoxal 5'-phosphate form at 1.9 A resolution and two complexes with 3-phenylpropionate and alpha-keto-gamma-methylthiobutyrate at 2.35 and 2.6 A resolution, respectively. The enzyme shows high activity toward phenylalanine, tyrosine, tryptophan, kynurenine, methionine, and glutamine. The enzyme is a homodimer, and each subunit is divided into an N-terminal arm and small and large domains. Based on its folding, the enzyme belongs to fold type I, aminotransferase subclass Ib. The subclass I aminotransferases whose structures have so far been determined exhibit a large movement of the small domain region upon binding of a substrate. Similarly, the glutamine:phenylpyruvate aminotransferase undergoes a large movement in part of the small domain to close the active site. The active-site pocket has a shape and size suitable to enclose the side chain of an aromatic amino acid or that of methionine. The inner side of the pocket is mostly hydrophobic, but also has polar sites. The kynurenine complex generated by computer modeling fits the pocket of the enzyme and its hydrophilic groups interact with the polar sites of the pocket.
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(as it appears on PubMed at http://www.pubmed.gov), where 14761974 is the PubMed ID number.
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{{ABSTRACT_PUBMED_14761974}}
==About this Structure==
==About this Structure==
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[[Category: Structural genomic]]
[[Category: Structural genomic]]
[[Category: Transferase]]
[[Category: Transferase]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 11:59:28 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun Jul 27 17:59:08 2008''

Revision as of 14:59, 27 July 2008

Image:1v2d.png

Template:STRUCTURE 1v2d

Crystal Structure of T.th HB8 Glutamine Aminotransferase

Template:ABSTRACT PUBMED 14761974

About this Structure

1V2D is a Single protein structure of sequence from Thermus thermophilus. Full crystallographic information is available from OCA.

Reference

Crystal structures of glutamine:phenylpyruvate aminotransferase from Thermus thermophilus HB8: induced fit and substrate recognition., Goto M, Omi R, Miyahara I, Hosono A, Mizuguchi H, Hayashi H, Kagamiyama H, Hirotsu K, J Biol Chem. 2004 Apr 16;279(16):16518-25. Epub 2004 Feb 3. PMID:14761974

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