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[[Image:1fxu.gif|left|200px]]
{{Seed}}
[[Image:1fxu.png|left|200px]]


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{{STRUCTURE_1fxu|  PDB=1fxu  |  SCENE=  }}  
{{STRUCTURE_1fxu|  PDB=1fxu  |  SCENE=  }}  


'''PURINE NUCLEOSIDE PHOSPHORYLASE FROM CALF SPLEEN IN COMPLEX WITH N(7)-ACYCLOGUANOSINE INHIBITOR AND A PHOSPHATE ION'''
===PURINE NUCLEOSIDE PHOSPHORYLASE FROM CALF SPLEEN IN COMPLEX WITH N(7)-ACYCLOGUANOSINE INHIBITOR AND A PHOSPHATE ION===




==Overview==
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The calf spleen purine nucleoside phosphorylase (PNP) ternary complex with an N(7)-acycloguanosine inhibitor and a phosphate ion has been crystallized in the cubic space group P2(1)3, with unit-cell parameter a = 94.11 A and one monomer per asymmetric unit. X-ray diffraction data were collected using synchrotron radiation (Station X31, EMBL Outstation, DESY, Hamburg). The crystal structure was refined to a resolution of 2.2 A and R and R(free) values of 17.5 and 24.5%, respectively. The acyclonucleoside inhibitor is bound in the active site in an inverted ('upside-down') orientation of the purine base compared with natural substrates. The side chain of Asp243 forms two hydrogen bonds with the base ring: N(delta) donates a hydrogen to N(3) and O(delta) accepts a hydrogen from the guanine N(2)-amino group. N(1)--H of the base is hydrogen bonded to O(epsilon) of Glu201, while N(9) accepts a hydrogen bond from Thr242 O(gamma). In addition, a water molecule (W417) bridges the N(2)-amino group of the base and O(epsilon) of Glu201. In the phosphate-binding site, a phosphate ion is bound to Ser33, His64, Arg84, His86, Ala116 and Ser220. The acyclic chain of the N(7)-acycloguanosine inhibitor is in a folded conformation and together with a water molecule (W388) occupies the pentose-binding site, with possible hydrogen bonds to Tyr88 O(eta) and His257 N(delta 1). This new binding mode fully accounts for the previously observed substrate properties of 7-beta-D-ribofuranosides of hypoxanthine and guanine. It also provides a new starting point for the design of inhibitors of PNP for therapeutic and other applications.
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{{ABSTRACT_PUBMED_11134924}}


==About this Structure==
==About this Structure==
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[[Category: Glycosyltransferase]]
[[Category: Glycosyltransferase]]
[[Category: Nucleoside phosphorylase]]
[[Category: Nucleoside phosphorylase]]
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Revision as of 01:06, 1 July 2008

File:1fxu.png

Template:STRUCTURE 1fxu

PURINE NUCLEOSIDE PHOSPHORYLASE FROM CALF SPLEEN IN COMPLEX WITH N(7)-ACYCLOGUANOSINE INHIBITOR AND A PHOSPHATE ION

Template:ABSTRACT PUBMED 11134924

About this Structure

1FXU is a Single protein structure of sequence from Bos taurus. Full crystallographic information is available from OCA.

Reference

Calf spleen purine nucleoside phosphorylase: structure of its ternary complex with an N(7)-acycloguanosine inhibitor and a phosphate anion., Luic M, Koellner G, Shugar D, Saenger W, Bzowska A, Acta Crystallogr D Biol Crystallogr. 2001 Jan;57(Pt 1):30-6. PMID:11134924

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