Abstract
A series of large chromosomal deletions in Streptomyces hygroscopicus 10-22 were aligned on the physical map of the wild-type strain and the mutants were assessed for their ability to produce the aminocyclitol antibiotic 5102-I (jinggangmycin). Twenty-eight mutants were blocked for jinggangmycin production and all of them were found to lack a 300 kb AseI-F fragment of the wild-type chromosome. An ordered cosmid library of the 300 kb AseI-F fragment was made and one of the cosmids conferred jinggangmycin productivity to Streptomyces lividans ZX1. Three of the overlapping cosmids (18G7, 5H3 and 9A2) also hybridized to the valA gene of the validamycin pathway from S. hygroscopicus 5008 as a probe. This gene resembles acbC from Actinoplanes sp. 50/110, which encodes a C7-cyclitol synthase that catalyses the transformation of sedoheptulose 7-phosphate into 2-5-epi-valiolone for acarbose biosynthesis. The valA/acbC-homolog (orf1) of S. hygroscopicus 10-22 was shown to be essential for jinggangmycin biosynthesis as an engineered mutant with a specific in-frame deletion removing a 609 bp sequence internal to orf1 completely abolished jinggangmycin production and the corresponding knock-out mutant (JXH4) could be complemented for jinggangmycin production by the introduction of an orf1-containing construct. Concurrently, the identities of the genes common to S. hygroscopicus strains 10-22 and 5008 prompted a comparison of the chemical structures of jinggangmycin and validamycin, which led to a clear demonstration that they are identical.
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Abbreviations
- PFGE:
-
pulsed-field gel electrophoresis
- HPLC:
-
high performance liquid chromatography
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Acknowledgements
The authors wish to thank David A. Hopwood, FRS for valuable comments and critical reading of the manuscript. This work received support from 973 (2003CB114205) and 863 programs of the Ministry of Science and Technology, the National Science Foundation of China, the Ph.D. Training Fund from the Ministry of Education, and the Shanghai Municipal Council of Science and Technology.
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Jian, X., Pang, X., Yu, Y. et al. Identification of genes necessary for jinggangmycin biosynthesis from Streptomyces hygroscopicus 10-22. Antonie Van Leeuwenhoek 90, 29–39 (2006). https://doi.org/10.1007/s10482-006-9058-x
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DOI: https://doi.org/10.1007/s10482-006-9058-x