Download MendeleyCatalytic center of an archaeal type 2 ribonuclease H as revealed by X-ray crystallographic and mutational analyses.
Muroya, A., Tsuchiya, D., Ishikawa, M., Haruki, M., Morikawa, M., Kanaya, S., Morikawa, K.(2001) Protein Sci 10: 707-714
- PubMed: 11274461
- DOI: https://doi.org/10.1110/ps.48001
- Primary Citation of Related Structures:
1IO2 - PubMed Abstract:
The catalytic center of an archaeal Type 2 RNase H has been identified by a combination of X-ray crystallographic and mutational analyses. The crystal structure of the Type 2 RNase H from Thermococcus kodakaraensis KOD1 has revealed that the N-terminal major domain adopts the RNase H fold, despite the poor sequence similarity to the Type 1 RNase H. Mutational analyses showed that the catalytic reaction requires four acidic residues, which are well conserved in the Type 1 RNase H and the members of the polynucleotidyl transferase family. Thus, the Type 1 and Type 2 RNases H seem to share a common catalytic mechanism, except for the requirement of histidine as a general base in the former enzyme. Combined with the results from deletion mutant analyses, the structure suggests that the C-terminal domain of the Type 2 RNase H is involved in the interaction with the DNA/RNA hybrid.
Organizational Affiliation:
Department of Material and Life Science, Graduate School of Engineering, Osaka University, Osaka 565-0871, Japan.
