Archives of Microbiology

, Volume 188, Issue 4, pp 377–387 | Cite as

Identification and characterization of two Streptomyces davawensis riboflavin biosynthesis gene clusters

  • Simon Grill
  • Hiroyuki Yamaguchi
  • Helen Wagner
  • Laure Zwahlen
  • Ute Kusch
  • Matthias Mack
Original Paper


In Streptomyces davawensis roseoflavin is synthesized from GTP and ribulose-5-phosphate through riboflavin. As a first step towards the molecular analysis of flavin metabolism in S. davawensis the genes involved in riboflavin biosynthesis were cloned by hybridization of heterologous probes to a genomic library on a high-density colony-array. The genes ribB (riboflavin synthase, α-chain; EC, ribM (putative membrane protein), ribA (bifunctional GTP cyclohydrolase II/3,4-dihydroxy-2-butanone-4-phosphate synthase; EC and ribH (lumazine synthase; EC are organized in an operon-like cluster. Northern blot analysis of this cluster revealed two transcripts of 1.7 and 3.1 kb, respectively. The gene ribB was overexpressed in Escherichia coli. The specific riboflavin synthase activity in a cell-free extract of a recombinant strain was 0.246 nmol mg−1 min−1. Overexpression of ribM enhanced the transport of riboflavin in the corresponding recombinant E. coli strain. Furthermore, overexpression of ribM increased roseoflavin sensitivity of E. coli. On another subgenomic fragment a putative S. davawensisribG gene coding for the missing pyrimidine deaminase/reductase (EC and EC of the riboflavin biosynthetic pathway and ribY coding for a second (monofunctional) GTP cyclohydrolase II were identified.


Riboflavin biosynthesis Streptomyces davawensis Roseoflavin 


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Copyright information

© Springer-Verlag 2007

Authors and Affiliations

  • Simon Grill
    • 1
  • Hiroyuki Yamaguchi
    • 1
  • Helen Wagner
    • 1
  • Laure Zwahlen
    • 1
  • Ute Kusch
    • 1
  • Matthias Mack
    • 1
  1. 1.Institute for Technical MicrobiologyMannheim University of Applied SciencesMannheimGermany

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