1m07

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[[Image:1m07.gif|left|200px]]
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{{STRUCTURE_1m07| PDB=1m07 | SCENE= }}
{{STRUCTURE_1m07| PDB=1m07 | SCENE= }}
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'''RESIDUES INVOLVED IN THE CATALYSIS AND BASE SPECIFICITY OF CYTOTOXIC RIBONUCLEASE FROM BULLFROG (RANA CATESBEIANA)'''
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===RESIDUES INVOLVED IN THE CATALYSIS AND BASE SPECIFICITY OF CYTOTOXIC RIBONUCLEASE FROM BULLFROG (RANA CATESBEIANA)===
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==Overview==
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The Rana catesbeiana (bullfrog) ribonucleases, which belong to the RNase A superfamily, exert cytotoxicity toward tumor cells. RC-RNase, the most active among frog ribonucleases, has a unique base preference for pyrimidine-guanine rather than pyrimidine-adenine in RNase A. Residues of RC-RNase involved in base specificity and catalytic activity were determined by site-directed mutagenesis, k(cat)/K(m) analysis toward dinucleotides, and cleavage site analysis of RNA substrate. The results show that Pyr-1 (N-terminal pyroglutamate), Lys-9, and Asn-38 along with His-10, Lys-35, and His-103 are involved in catalytic activity, whereas Pyr-1, Thr-39, Thr-70, Lys-95, and Glu-97 are involved in base specificity. The cytotoxicity of RC-RNase is correlated, but not proportional to, its catalytic activity. The crystal structure of the RC-RNase.d(ACGA) complex was determined at 1.80 A resolution. Residues Lys-9, His-10, Lys-35, and His-103 interacted directly with catalytic phosphate at the P(1) site, and Lys-9 was stabilized by hydrogen bonds contributed by Pyr-1, Tyr-28, and Asn-38. Thr-70 acts as a hydrogen bond donor for cytosine through Thr-39 and determines B(1) base specificity. Interestingly, Pyr-1 along with Lys-95 and Glu-97 form four hydrogen bonds with guanine at B(2) site and determine B(2) base specificity.
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{{ABSTRACT_PUBMED_12499382}}
==About this Structure==
==About this Structure==
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[[Category: Cytotoxicity]]
[[Category: Cytotoxicity]]
[[Category: Ribonuclease]]
[[Category: Ribonuclease]]
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Revision as of 19:55, 2 July 2008

Image:1m07.png

Template:STRUCTURE 1m07

RESIDUES INVOLVED IN THE CATALYSIS AND BASE SPECIFICITY OF CYTOTOXIC RIBONUCLEASE FROM BULLFROG (RANA CATESBEIANA)

Template:ABSTRACT PUBMED 12499382

About this Structure

1M07 is a Single protein structure of sequence from Rana catesbeiana. Full crystallographic information is available from OCA.

Reference

Residues involved in the catalysis, base specificity, and cytotoxicity of ribonuclease from Rana catesbeiana based upon mutagenesis and X-ray crystallography., Leu YJ, Chern SS, Wang SC, Hsiao YY, Amiraslanov I, Liaw YC, Liao YD, J Biol Chem. 2003 Feb 28;278(9):7300-9. Epub 2002 Dec 23. PMID:12499382

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