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1jp7

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[[Image:1jp7.jpg|left|200px]]
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{{STRUCTURE_1jp7| PDB=1jp7 | SCENE= }}
{{STRUCTURE_1jp7| PDB=1jp7 | SCENE= }}
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'''Crystal Structure of 5'-deoxy-5'-methylthioadenosine phosphorylase'''
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===Crystal Structure of 5'-deoxy-5'-methylthioadenosine phosphorylase===
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==Overview==
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The structure of 5'-deoxy-5'-methylthioadenosine phosphorylase from Sulfolobus solfataricus (SsMTAP) has been determined alone, as ternary complexes with sulfate plus substrates 5'-deoxy-5'-methylthioadenosine, adenosine, or guanosine, or with the noncleavable substrate analog Formycin B and as binary complexes with phosphate or sulfate alone. The structure of unliganded SsMTAP was refined at 2.5-A resolution and the structures of the complexes were refined at resolutions ranging from 1.6 to 2.0 A. SsMTAP is unusual both for its broad substrate specificity and for its extreme thermal stability. The hexameric structure of SsMTAP is similar to that of purine-nucleoside phosphorylase (PNP) from Escherichia coli, however, only SsMTAP accepts 5'-deoxy-5'-methylthioadenosine as a substrate. The active site of SsMTAP is similar to that of E. coli PNP with 13 of 18 nearest residues being identical. The main differences are at Thr(89), which corresponds to serine in E. coli PNP, and Glu(163), which corresponds to proline in E. coli PNP. In addition, a water molecule is found near the purine N-7 position in the guanosine complex of SsMTAP. Thr(89) is near the 5'-position of the nucleoside and may account for the ability of SsMTAP to accept either hydrophobic or hydrophilic substituents in that position. Unlike E. coli PNP, the structures of SsMTAP reveal a substrate-induced conformational change involving Glu(163). This residue is located at the interface between subunits and swings in toward the active site upon nucleoside binding. The high-resolution structures of SsMTAP suggest that the transition state is stabilized in different ways for 6-amino versus 6-oxo substrates. SsMTAP has optimal activity at 120 degrees C and retains full activity after 2 h at 100 degrees C. Examination of the three-dimensional structure of SsMTAP suggests that unlike most thermophilic enzymes, disulfide linkages play a key in role in its thermal stability.
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(as it appears on PubMed at http://www.pubmed.gov), where 11489901 is the PubMed ID number.
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{{ABSTRACT_PUBMED_11489901}}
==About this Structure==
==About this Structure==
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[[Category: Porcelli, M.]]
[[Category: Porcelli, M.]]
[[Category: Alpha-beta protein]]
[[Category: Alpha-beta protein]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 1 20:35:12 2008''

Revision as of 17:35, 1 July 2008

Image:1jp7.png

Template:STRUCTURE 1jp7

Crystal Structure of 5'-deoxy-5'-methylthioadenosine phosphorylase

Template:ABSTRACT PUBMED 11489901

About this Structure

1JP7 is a Single protein structure of sequence from Sulfolobus solfataricus. Full crystallographic information is available from OCA.

Reference

Three-dimensional structure of a hyperthermophilic 5'-deoxy-5'-methylthioadenosine phosphorylase from Sulfolobus solfataricus., Appleby TC, Mathews II, Porcelli M, Cacciapuoti G, Ealick SE, J Biol Chem. 2001 Oct 19;276(42):39232-42. Epub 2001 Aug 6. PMID:11489901

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