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2015 ; 14
(ä): 154
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Prophage recombinases-mediated genome engineering in Lactobacillus plantarum
#MMPMID26438232
Yang P
; Wang J
; Qi Q
Microb Cell Fact
2015[Oct]; 14
(ä): 154
PMID26438232
show ga
BACKGROUND: Lactobacillus plantarum is a food-grade microorganism with industrial
and medical relevance belonging to the group of lactic acid bacteria (LAB).
Traditional strategies for obtaining gene deletion variants in this organism are
mainly vector-based double-crossover methods, which are inefficient and
laborious. A feasible possibility to solve this problem is the recombineering,
which greatly expands the possibilities for engineering DNA molecules in vivo in
various organisms. RESULTS: In this work, a double-stranded DNA (dsDNA)
recombineering system was established in L. plantarum. An exonuclease encoded by
lp_0642 and a potential host-nuclease inhibitor encoded by lp_0640 involved in
dsDNA recombination were identified from a prophage P1 locus in L. plantarum
WCFS1. These two proteins, combined with the previously characterized single
strand annealing protein encoded by lp_0641, can perform homologous recombination
between a heterologous dsDNA substrate and host genomic DNA. Based on this, we
developed a method for marker-free genetic manipulation of the chromosome in L.
plantarum. CONCLUSIONS: This Lp_0640-41-42-mediated recombination allowed easy
screening of mutants and could serve as an alternative to other genetic
manipulation methods. We expect that this method can help for understanding the
probiotic functionality and physiology of LAB.