The SCO2299 gene from Streptomyces coelicolor A3(2) encodes a bifunctional enzyme consisting of an RNase H domain and an acid phosphatase domain

Naoto Ohtani, Natsumi Saito, Masaru Tomita, Mitsuhiro Itaya, Aya Itoh

研究成果: Article査読

10 被引用数 (Scopus)

抄録

The SCO2299 gene from Streptomyces coelicolor encodes a single peptide consisting of 497 amino acid residues. Its N-terminal region shows high amino acid sequence similarity to RNase HI, whereas its C-terminal region bears similarity to the CobC protein, which is involved in the synthesis of cobalamin. The SCO2299 gene suppressed a temperature-sensitive growth defect of an Escherichia coli RNase H-deficient strain, and the recombinant SCO2299 protein cleaved an RNA strand of RNA-DNA hybrid in vitro. The N-terminal domain of the SCO2299 protein, when overproduced independently, exhibited RNase H activity at a similar level to the full length protein. On the other hand, the C-terminal domain showed no CobC-like activity but an acid phosphatase activity. The full length protein also exhibited acid phosphatase activity at almost the same level as the C-terminal domain alone. These results indicate that RNase H and acid phosphatase activities of the full length SCO2299 protein depend on its N-terminal and C-terminal domains, respectively. The physiological functions of the SCO2299 gene and the relation between RNase H and acid phosphatase remain to be determined. However, the bifunctional enzyme examined here is a novel style in the Type 1 RNase H family. Additionally, S. coelicolor is the first example of an organism whose genome contains three active RNase H genes.

本文言語English
ページ(範囲)2828-2837
ページ数10
ジャーナルFEBS Journal
272
11
DOI
出版ステータスPublished - 2005 6

ASJC Scopus subject areas

  • 生化学
  • 分子生物学
  • 細胞生物学

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