title: Phylogenetic analysis and heterologous expression of surface layer protein SlpC of Bacillus sphaericus C3-41.
abstract: The surface layer protein encoding genes from five mosquito-pathogenic Bacillus sphaericus isolates were amplified and sequenced. Negative staining of the S-layer protein extracted from the cell wall of wild-type B. sphaericus C3-41 was prepared. It showed a flat-sheet crystal lattice structure. Two genes encoding the entire and N-terminally truncated S-layer protein (slpC and DeltaslpC respectively), were ligated into plasmid pET28a and expressed in Escherichia coli. SDS-PAGE revealed that about 130 KD and 110 KD proteins could be expressed in the cytoplasm of recombinant E. coli BL21(pET28a/slpC) and E. coli BL21(pET28a/DeltaslpC) respectively. Furthermore, an intracellular sheet-like or fingerprint-shape structure was investigated in two recombinant strains, which expressed SlpC and DeltaSlpC protein respectively, by ultrathin microscopy study, but bioassay results suggested that the S-layer protein of wild B. sphaericus C3-41 and recombinant E. coli BL21 (pET28a/slpC) have no direct toxicity against mosquito larvae. These results should provide information for further understanding of the function of S-layer protein of pathogenic B. sphaericus.
authors.affiliation: State Key Laboratory of Virology, Wuhan Institute of Virology, Chinese Academy of Sciences, Wuhan 430071, China.
authors.forename: Xiaomin
authors.initials: X
authors.lastname: Hu
authors.forename: Jia
authors.initials: J
authors.lastname: Li
authors.forename: Bjarne Munk
authors.initials: BM
authors.lastname: Hansen
authors.forename: Zhiming
authors.initials: Z
authors.lastname: Yuan
mesh_terms: D000818:Animals; D001407:Bacillus / Q000235:genetics* / Q000302:isolation & purification; D001426:Bacterial Proteins / Q000737:chemistry / Q000235:genetics* / Q000302:isolation & purification / Q000633:toxicity*; D002473:Cell Wall / Q000737:chemistry; D003001:Cloning, Molecular; D003460:Crystallization; D009033:Culicidae / Q000187:drug effects / Q000254:growth & development; D004269:DNA, Bacterial / Q000235:genetics; D015964:Gene Expression Regulation, Bacterial; D007814:Larva / Q000187:drug effects; D008562:Membrane Glycoproteins / Q000737:chemistry / Q000235:genetics* / Q000302:isolation & purification / Q000633:toxicity*; D008969:Molecular Sequence Data; D010802:Phylogeny; D011993:Recombinant Fusion Proteins / Q000737:chemistry / Q000235:genetics / Q000302:isolation & purification / Q000633:toxicity; D017422:Sequence Analysis, DNA
chemical_list: D001426:Bacterial Proteins; D004269:DNA, Bacterial; D008562:Membrane Glycoproteins; D011993:Recombinant Fusion Proteins; C055764:S-layer proteins