Isolation, cloning and characterisation of the abiI gene from Lactococcus lactis subsp lactis M138 encoding abortive phage infection

被引:22
作者
Su, P
Harvey, M
Im, HJ
Dunn, NW
机构
[1] UNIV NEW S WALES,DEPT BIOTECHNOL,COOPERAT RES CTR FOOD IND INNOVAT,SYDNEY,NSW 2052,AUSTRALIA
[2] MAURI LABS,COOPERAT RES CTR FOOD IND INNOVAT,MOOREBANK,NSW 2170,AUSTRALIA
关键词
Lactococcus lactis; plasmid pND852; abiI gene; phage resistance; abortive infective;
D O I
10.1016/S0168-1656(97)01692-1
中图分类号
Q81 [生物工程学(生物技术)]; Q93 [微生物学];
学科分类号
071005 ; 0836 ; 090102 ; 100705 ;
摘要
Plasmid pND852 (56 kb) encodes nisin resistance and was isolated from Lactococcus lactis ssp lactis (L. laclis) M138 by conjugation to L. lactis LM0230. It conferred strong resistance to the isometric-headed phage phi 712 and partial resistance to the prolate-headed phage phi c2. A 2.6 kb HpaII fragment encoding phage resistance was cloned into the streptococcal/Bacillus hybrid vector pGB301 to generate pND817. The mechanism of phage resistance encoded by pND817 involved abortive infection and this was illustrated by a reduction in burst size from 166 to 6 at 30 degrees C and from 160 to 90 at 37 degrees C. Partial resistance was therefore retained at 37 degrees C. DNA sequencing revealed that the abortive infection was encoded by a single open reading frame (ORF), designated abiI, encoding a 332 amino acid protein. Neither abil nor the predicted product showed significant homology to any existing sequence in the GenBank database. Frame shift mutation at the unique EcoRI site within the ORF resulted in loss of the Abi(+) phenotype, confirming that the ORF is responsible for the encoded phage resistance. (C) 1997 Elsevier Science B.V.
引用
收藏
页码:95 / 104
页数:10
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