1ai9

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{{STRUCTURE_1ai9| PDB=1ai9 | SCENE= }}
{{STRUCTURE_1ai9| PDB=1ai9 | SCENE= }}
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'''CANDIDA ALBICANS DIHYDROFOLATE REDUCTASE'''
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===CANDIDA ALBICANS DIHYDROFOLATE REDUCTASE===
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==Overview==
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The recent rise in systemic fungal infections has created a need for the development of new antifungal agents. As part of an effort to provide therapeutically effective inhibitors of fungal dihydrofolate reductase (DHFR), we have cloned, expressed, purified, crystallized, and determined the three-dimensional structure of Candida albicans DHFR. The 192-residue enzyme, which was expressed in Escherichia coli and purified by methotrexate affinity and cation exchange chromatography, was 27% identical to human DHFR. Crystals of C. albicans DHFR were grown as the holoenzyme complex and as a ternary complex containing a pyrroloquinazoline inhibitor. Both complexes crystallized with two molecules in the asymmetric unit in space group P21. The final structures had R-factors of 0.199 at 1.85-A resolution and 0.155 at 1.60-A resolution, respectively. The enzyme fold was similar to that of bacterial and vertebrate DHFR, and the binding of a nonselective diaminopyrroloquinazoline inhibitor and the interactions of NADPH with protein were typical of ligand binding to other DHFRs. However, the width of the active site cleft of C. albicans DHFR was significantly larger than that of the human enzyme, providing a basis for the design of potentially selective inhibitors.
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(as it appears on PubMed at http://www.pubmed.gov), where 9374515 is the PubMed ID number.
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{{ABSTRACT_PUBMED_9374515}}
==About this Structure==
==About this Structure==
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[[Category: Oxidoreductase]]
[[Category: Oxidoreductase]]
[[Category: Reductase]]
[[Category: Reductase]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May 2 10:18:15 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jun 30 16:54:22 2008''

Revision as of 13:54, 30 June 2008

Image:1ai9.png

Template:STRUCTURE 1ai9

CANDIDA ALBICANS DIHYDROFOLATE REDUCTASE

Template:ABSTRACT PUBMED 9374515

About this Structure

1AI9 is a Single protein structure of sequence from Candida albicans. Full crystallographic information is available from OCA.

Reference

X-ray crystallographic studies of Candida albicans dihydrofolate reductase. High resolution structures of the holoenzyme and an inhibited ternary complex., Whitlow M, Howard AJ, Stewart D, Hardman KD, Kuyper LF, Baccanari DP, Fling ME, Tansik RL, J Biol Chem. 1997 Nov 28;272(48):30289-98. PMID:9374515

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