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首页> 外文期刊>Journal of bacteriology >TrbK, a small cytoplasmic membrane lipoprotein, functions in entry exclusion of the IncP alpha plasmid RP4.
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TrbK, a small cytoplasmic membrane lipoprotein, functions in entry exclusion of the IncP alpha plasmid RP4.

机译:TrbK是一种小的细胞质膜脂蛋白,在IncPα质粒RP4的进入排斥中起作用。

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TrbK is the only plasmid-encoded gene product involved in entry exclusion of the broad-host-range plasmid RP4. The corresponding gene, trbK, coding for a protein of 69 amino acid residues maps in the Tra2 region within the mating pair formation genes. TrbK carries a lipid moiety at the N-terminal cysteine of the mature 47-residue polypeptide. The mutant protein TrbKC23G cannot be modified or proteolytically processed but still acts in entry exclusion with reduced efficiency. An 8-amino-acid truncation at the C terminus of TrbK results in a complete loss of the entry exclusion activity but still allows the protein to be processed. TrbK localizes predominately to the cytoplasmic membrane. Its function depends on presence in the recipient cell but not in the donor cell. TrbK excludes plasmids of homologous systems of the P complex; it is inert towards the IncI system. The likely target for TrbK action is the mating pair formation system, because DNA or any of the components of the relaxosome were excluded as possible targets.
机译:TrbK是唯一参与宽宿主范围质粒RP4进入排斥的质粒编码基因产物。编码69个氨基酸残基的蛋白质的相应基因trbK在配对对形成基因内的Tra2区域中定位。 TrbK在成熟的47个残基多肽的N端半胱氨酸上带有脂质部分。突变蛋白TrbKC23G不能被修饰或蛋白水解加工,但仍以降低的效率在进入排斥中起作用。 TrbK C末端的8个氨基酸被截断,导致进入排斥活性完全丧失,但仍允许蛋白质被加工。 TrbK主要定位于细胞质膜。其功能取决于受体细胞中的存在,而不取决于供体细胞中的存在。 TrbK不包括P复合物同源系统的质粒;它对IncI系统是惰性的。 TrbK作用的可能靶标是交配对形成系统,因为DNA或弛豫体的任何组分均被排除在可能的靶标之外。

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