Wu_2012_BMC.Genomics_13_337

Reference

Title : Genomic and transcriptomic insights into the thermo-regulated biosynthesis of validamycin in Streptomyces hygroscopicus 5008 - Wu_2012_BMC.Genomics_13_337
Author(s) : Wu H , Qu S , Lu C , Zheng H , Zhou X , Bai L , Deng Z
Ref : BMC Genomics , 13 :337 , 2012
Abstract :

BACKGROUND: Streptomyces hygroscopicus 5008 has been used for the production of the antifungal validamycin/jinggangmycin for more than 40 years. A high yield of validamycin is achieved by culturing the strain at 37 degreesC, rather than at 30 degreesC for normal growth and sporulation. The mechanism(s) of its thermo-regulated biosynthesis was largely unknown. RESULTS: The 10,383,684-bp genome of strain 5008 was completely sequenced and composed of a linear chromosome, a 164.57-kb linear plasmid, and a 73.28-kb circular plasmid. Compared with other Streptomyces genomes, the chromosome of strain 5008 has a smaller core region and shorter terminal inverted repeats, encodes more alpha/beta hydrolases, major facilitator superfamily transporters, and Mg2+/Mn2+-dependent regulatory phosphatases. Transcriptomic analysis revealed that the expression of 7.5% of coding sequences was increased at 37 degreesC, including biosynthetic genes for validamycin and other three secondary metabolites. At 37 degreesC, a glutamate dehydrogenase was transcriptionally up-regulated, and further proved its involvement in validamycin production by gene replacement. Moreover, efficient synthesis and utilization of intracellular glutamate were noticed in strain 5008 at 37 degreesC, revealing glutamate as the nitrogen source for validamycin biosynthesis. Furthermore, a SARP-family regulatory gene with enhanced transcription at 37 degreesC was identified and confirmed to be positively involved in the thermo-regulation of validamycin production by gene inactivation and transcriptional analysis. CONCLUSIONS: Strain 5008 seemed to have evolved with specific genomic components to facilitate the thermo-regulated validamycin biosynthesis. The data obtained here will facilitate future studies for validamycin yield improvement and industrial bioprocess optimization.

PubMedSearch : Wu_2012_BMC.Genomics_13_337
PubMedID: 22827618
Gene_locus related to this paper: strhj-h2k4a5

Related information

Gene_locus strhj-h2k4a5

Citations formats

Wu H, Qu S, Lu C, Zheng H, Zhou X, Bai L, Deng Z (2012)
Genomic and transcriptomic insights into the thermo-regulated biosynthesis of validamycin in Streptomyces hygroscopicus 5008
BMC Genomics 13 :337

Wu H, Qu S, Lu C, Zheng H, Zhou X, Bai L, Deng Z (2012)
BMC Genomics 13 :337