Residues involved in the catalysis, base specificity, and cytotoxicity of ribonuclease from Rana catesbeiana based upon mutagenesis and X-ray crystallographyLeu, Y.-J., Chern, S.-S., Wang, S.-C., Hsiao, Y.-Y., Amiraslanov, I., Liaw, Y.-C., Liao, Y.-D.
(2003) J.Biol.Chem. 278: 7300-7309
- PubMed: 12499382
- DOI: 10.1074/jbc.M206701200
- PubMed Abstract:
- PURIFICATION AND CLONING OF CYTOTOXIC RIBONUCLEASE FROM RANA CATESBEIANA (BULLFROG)
Liao, Y.D.,Huang, H.C.,Leu, Y.J.,Wei, C.W.,Tang, P.C.,Wang, S.C.
(2000) Nucleic Acids Res. 28: 4097
- THE CRYSTAL STRUCTURE OF A CYTOTOXIC RIBONUCLEASE FROM THE OOCYTE OF RANA CATESBEIANA
Leu, Y.-J.,Chern, S.-S.,Wang, S.-C.,Hsiao, Y.-Y.,Amiraslanov, I.R.,Liaw, Y.-C.,Liao, Y.-D.
() TO BE PUBLISHED --: --
- THE SECONDARY STRUCTURE OF A PYRIMIDINE-GUANINE SEQUENCE-SPECIFIC RIBONUCLEASE POSSESSING CYTOTOXIC ACTIVITY FROM THE OOCYTE OF RANA CATESBEIANA
Chen, C.,Hom, K.,Huang, R.F.,Chou, P.J.,Liao, Y.D.,Huang, T.
(1996) J.BIOMOL.NMR 8: 331
- THE RANA CATESBEIANA RCR GENE ENCODING A CYTOTOXIC RIBONUCLEASE : TISSUE DISTRIBUTION, CLONING, PURIFICATION, CYTOTOXICITY, AND ACTIVE RESIDUES FOR RNASE ACTIVITY
Huang, H.C.,Wang, S.C.,Leu, Y.J.,Lu, S.C.,Liao, Y.D.
(1998) J.Biol.Chem. 273: 6395
- THE SOLUTION STRUCTURE OF A CYTOTOXIC RIBONUCLEASE FROM THE OOCYTE OF RANA CATESBEIANA (BULLFROG)
Chang, C.F.,Chen, C.,Chen, Y.C.,Hom, K.,Huang, R.F.,Huang, T.H.
(1998) J.Mol.Biol. 283: 231
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 pyrimid ...
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.
Institute of Biomedical Sciences and the Institute of Molecular Biology, Academia Sinica, Taipei 115, and the Department of Life Science, National Tsing-Hua University, Hsin-Chu 300, Taiwan.