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Screening and identification of lignin-degrading bacteria in termite gut and the construction of LiP-expressing recombinant Lactococcus lactis.

Abstract：

:Lignin, a common natural polymers, is abundant and complex, and termites can break down and utilize the lignin in their food. In this study an attempt was made to isolate and characterize the lignolytic bacteria from termite (Reticulitermes chinensis Snyder) gut. Two strains (PY12 and MX5) with high lignin peroxidase (LiP) activity were screened using the azure B method. By analyzing their 16S rRNA, the strain PY12 was classified as Enterobacter hormaechei; MX5, as Bacillus licheniformis. We then optimized the different conditions of liquid fermentation medium, and obtained LiP activities of 278 U/L and 256 U/L for PY12 and MX5, respectively. Subsequently, we confirmed the LiP activities of the strains by evaluating their decolorizing effects on various dyes. Finally, we cloned the LiP gene of strain PY12 and successfully transferred it to Lactococcus lactis. We believe that our results provide the theoretical and practical basis for the production of genetically engineered bacteria that produce LiP, thus allowing for the utilization of naturally available lignin as an energy resource.

journal_name

Microb Pathog

journal_title

Microbial pathogenesis

authors

Zhou H,Guo W,Xu B,Teng Z,Tao D,Lou Y,Gao Y

doi

10.1016/j.micpath.2017.09.047

subject

Has Abstract

pub_date

2017-11-01 00:00:00

pages

63-69

eissn

0882-4010

issn

1096-1208

pii

S0882-4010(17)30497-7

journal_volume

112

pub_type

杂志文章

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