Heterotrimeric complex of replication protein A, a single-stranded DNA binding protein, from the silkworm, Bombyx mori

Ryohei Sugahara, Hiroaki Mon, Jun Yamashita, Hitoshi Mitsunobu, Jae Man Lee, Yutaka Kawaguchi, Katsumi Koga, Takahiro Kusakabe

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2 Citations (Scopus)


Replication protein A (Rpa) is a heterotrimeric protein complex, composed of three tightly associated subunits of RPA70 (Rpa1), RPA32 (Rpa2) and RPA14 (Rpa3) in the case of human cells. The Rpa is known to be required for almost all aspects of cellular DNA metabolism. In the present study, we isolated and characterized the cDNAs orthologous to the Homo sapience RPA2 and RPA3, BmRPA2 and BmRPA3, respectively, from the silkworm, Bombyx mori. Each gene has a single conserved OB-fold domain. Although there was a higher level of homology among Rpa2s from different species, those of Rpa3s were very low. Furthermore, the analysis using yeast two-hybrid system revealed that the BmRpa2 and BmRpa3 form a tight heterotrimeric complex with BmRpa1. In addition, we confirmed the silkworm Rpa complex binds single-stranded DNA, but not double-stranded DNA.

Original languageEnglish
Pages (from-to)129-135
Number of pages7
JournalJournal of Insect Biotechnology and Sericology
Issue number3
Publication statusPublished - Oct 1 2007


All Science Journal Classification (ASJC) codes

  • Biotechnology
  • Applied Microbiology and Biotechnology
  • Business, Management and Accounting(all)
  • Agricultural and Biological Sciences(all)
  • Insect Science
  • Industrial and Manufacturing Engineering

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