1yry
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(New page: 200px<br /> <applet load="1yry" size="450" color="white" frame="true" align="right" spinBox="true" caption="1yry, resolution 2.80Å" /> '''Crystal structure o...)
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Revision as of 18:17, 12 November 2007
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Crystal structure of human PNP complexed with MESG
Contents |
Overview
Purine nucleoside phosphorylase (PNP) catalyzes the reversible, phosphorolysis of nucleosides and deoxynucleosides, generating ribose, 1-phosphate and the purine base, which is an important step of purine, catabolism pathway. The lack of such an activity in humans, owing to a, genetic disorder, causes T-cell impairment, and drugs that inhibit this, enzyme may have the potential of being utilized as modulators of the, immunological system to treat leukemia, autoimmune diseases, and rejection, in organ transplantation. Here, we describe kinetics and crystal structure, of human PNP in complex with 7-methyl-6-thio-guanosine, a synthetic, substrate, which is largely used in activity assays. Analysis of the, structure identifies different protein conformational changes upon ligand, binding, and comparison of kinetic and structural data permits an, understanding of the effects of atomic substitution on key positions of, the synthetic substrate and their consequences to enzyme binding and, catalysis. Such knowledge may be helpful in designing new PNP inhibitors.
Disease
Known diseases associated with this structure: Neutral lipid storage disease with myopathy OMIM:[609059], Nucleoside phosphorylase deficiency, immunodeficiency due to OMIM:[164050]
About this Structure
1YRY is a Single protein structure of sequence from Homo sapiens with SO4 and MSG as ligands. Active as Purine-nucleoside phosphorylase, with EC number 2.4.2.1 Full crystallographic information is available from OCA.
Reference
Kinetics and crystal structure of human purine nucleoside phosphorylase in complex with 7-methyl-6-thio-guanosine., Silva RG, Pereira JH, Canduri F, de Azevedo WF Jr, Basso LA, Santos DS, Arch Biochem Biophys. 2005 Oct 1;442(1):49-58. PMID:16154528
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