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Journal of Biochemistry Advance Access published online on August 31, 2006
Journal of Biochemistry, doi:10.1093/jb/mvj183
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© 2006 The Japanese Biochemical Society.
Received April 27, 2006
Accepted August 22, 2006

Regular Paper

Crystal Structure of TTHA0252 from Thermus thermophilus HB8, a RNA Degradation Protein of the Metallo-{beta}-lactamase Superfamily

Hirohito Ishikawa 1, Noriko Nakagawa 2, Seiki Kuramitsu 2, and Ryoji Masui 2 *

1 Department of Biology, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan
2 Department of Biology, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan; RIKEN Harima Institute at SPring-8, 1-1-1 Kouto, Sayo-cho, Sayo, Hyogo 113-0033, Japan

* To whom correspondence should be addressed.
Ryoji Masui, E-mail: rmasui{at}bio.sci.osaka-u.ac.jp


  Abstract

In bacterial RNA metabolism, mRNA degradation is an important process for gene expression. Recently, a novel ribonuclease (RNase), belonging to the {beta}-CASP family within the metallo-{beta}-lactamase superfamily, was identified as a functional homologue of RNase E, a major component for mRNA degradation in E. coli. Here, we have determined the crystal structure of TTHA0252 from Thermus thermophilus HB8, which represents the first report of the tertiary structure of a {beta}-CASP family protein. TTHA0252 comprises two separate domains: a metallo-{beta}-lactamase domain and a "clamp" domain. The active site of the enzyme is located in a cleft between the two domains, which includes two zinc ions coordinated by six conserved residues. Although this configuration is similar to those of other {beta}-lactamases, TTHA0252 has one conserved His residue characteristic of the {beta}-CASP family as a ligand. We also detected nuclease activity of TTHA0252 against rRNAs of T. thermophilus. Our results reveal structural and functional aspects of novel RNase E-like enzymes with a {beta}-CASP fold.

Keywords: {beta}-CASP; crystal structure; metallo-{beta}-lactamase superfamily; RNase; Thermus thermophilus.
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