Open AccessSerratia marcescens SYBC08 catalase isolated from sludge containing hydrogen peroxide shows increased catalase production by regulation of carbon metabolism
Author(s) -
Zeng HuaWei,
Cai YuJie,
Liao XiangRu,
Zhang Feng,
Li YuLin,
Zeng XiangKang,
Zhang DaBing
Publication year - 2011
Publication title -
engineering in life sciences
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.547
H-Index - 57
eISSN - 1618-2863
pISSN - 1618-0240
DOI - 10.1002/elsc.201000115
Subject(s) - serratia marcescens , catalase , hydrogen peroxide , microbiology and biotechnology , citric acid , food science , spore , biology , bacteria , micrococcus luteus , chemistry , biochemistry , enzyme , escherichia coli , gene , genetics
A high‐catalase‐producing strain, which was isolated from sludge containing hydrogen peroxide, was identified as Serratia marcescens SYBC08 by 16S rDNA sequence analysis. Serratia spp. was reported as non‐spore‐forming bacterium (except S. marcescens spp. sakuensis ), but in our study electron microscopic observation revealed that the strain did produce spores. The content of the main fatty acid C 16:0 (14.8%) was significantly different from that of S. marcescens spp. sakuensis (33.2%) and S. marcescens spp. marcescens DSM 30121 T (34.8%), and the biochemical characteristics were not identical to those of S. marcescens spp. sakuensis . We speculate that the relatively high catalase activity and the spore structures may enable the strain to survive in a hydrogen peroxide environment. The most suitable carbon and nitrogen sources for the catalase production by S. marcescens SYBC08 were citric acid and corn steep liquor powder. A strategy of carbon metabolism regulation to enhance the catalase production was exploited. In the 7‐L fermenter, catalase production (20 353 U/mL) obtained in the presence of glucose and citric acid was 1.68‐ and 1.31‐fold higher than that obtained in the presence of glucose or citric acid, at equimolar carbon concentration. This production yield was much higher than that of many catalase‐producing strains, but only slightly lower than the production by Micrococcus luteus (34 601 U/mL). The results suggest that the new spore‐forming S. marcescens SYBC08 is a potential candidate for the production of catalase.