1xi2

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[[Image:1xi2.jpg|left|200px]]
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{{Seed}}
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{{STRUCTURE_1xi2| PDB=1xi2 | SCENE= }}
{{STRUCTURE_1xi2| PDB=1xi2 | SCENE= }}
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'''Quinone Reductase 2 in Complex with Cancer Prodrug CB1954'''
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===Quinone Reductase 2 in Complex with Cancer Prodrug CB1954===
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==Overview==
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CB1954 is a cancer pro-drug that can be activated through reduction by Escherichia coli nitro-reductases and quinone reductases. Human quinone reductase 2 is very efficient in the activation of CB1954, approximately 3000 times more efficient than human QR1 in terms of k(cat)/K(m). We have solved the three-dimensional structure of QR2 in complex with CB1954 to a nominal resolution of 1.5A. The complex structure indicates the essentiality of the two nitro groups: one nitro group forms hydrogen bonds with the side-chain of Asn161 of QR2 to hold the other nitro group in position for the reduction. We further conclude that residue 161, an Asn in QR2 and a His in QR1, is critical in differentiating the substrate specificities of these two enzymes. Mutation of Asn161 to His161 in QR2 resulted in the total loss of the enzymatic activity towards activation of CB1954, whereas the rates of reduction towards menadione are not altered.
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(as it appears on PubMed at http://www.pubmed.gov), where 16129418 is the PubMed ID number.
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{{ABSTRACT_PUBMED_16129418}}
==About this Structure==
==About this Structure==
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[[Category: Cb1954]]
[[Category: Cb1954]]
[[Category: Qr2]]
[[Category: Qr2]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 15:03:38 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jul 28 01:14:38 2008''

Revision as of 22:14, 27 July 2008

Image:1xi2.png

Template:STRUCTURE 1xi2

Quinone Reductase 2 in Complex with Cancer Prodrug CB1954

Template:ABSTRACT PUBMED 16129418

About this Structure

1XI2 is a Single protein structure of sequence from Homo sapiens. Full crystallographic information is available from OCA.

Reference

Crystal structure of quinone reductase 2 in complex with cancer prodrug CB1954., Fu Y, Buryanovskyy L, Zhang Z, Biochem Biophys Res Commun. 2005 Oct 14;336(1):332-8. PMID:16129418

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