A novel gene - samfR involved in early stage of Streptomyces ansochromogenes differentiation

Yuqing Tian, Gang Liu, Liping Nie, Junyong Jia, Huarong Tan, K. F. Chater

Research output: Contribution to journalArticlepeer-review


A 4.6 kb DNA fragment was cloned from the DNA library of Streptomyces ansochromogenes using a partial DNA fragment located in the downstream of promoter-PTH4 as probe. The experiments revealed that this DNA fragment consists of sawD gene and a 1.4 kb Pvu II fragment which can accelerate mycelium formation of S. ansochromogenes. The nucleotide sequence of 1.4 kb DNA fragment was determined and analysed; the result indicated that the fragment contains one complete open reading frame (ORF) which encodes a protein with 213 amino acids, and this gene was designated as samfR. The deduced protein has 36% amino acid identities and 52% amino acid similarities in comparison with that encoded by hppR gene, which is involved in the regulation of catabolism for 3-(3-hydroxyphenyl) propionate (3HPP) in Rhodococcus globerulus. The function of samfR gene was studied using strategy of gene disruption, and the resulting samfR mutant failed to form aerial hyphae and spores, its development and differentiation stopped at the stage of substrate mycelium in contrast with wild type strain. The results showed that the samfR gene is closely related to S. ansochromogenes differentiation.

Original languageEnglish (US)
Pages (from-to)575-576
Number of pages2
JournalScience in China, Series C: Life Sciences
Issue number6
StatePublished - Dec 1999
Externally publishedYes


  • Gene disruption
  • SamfR
  • Streptomyces differentiation

ASJC Scopus subject areas

  • Agricultural and Biological Sciences(all)
  • Agricultural and Biological Sciences (miscellaneous)


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