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Analysis of a DNA polymorphic region in the gtfB and gtfC genes of Streptococcus mutans.

机译:变形链球菌gtfB和gtfC基因的DNA多态性区域分析。

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We have previously demonstrated the existence of DNA polymorphisms at the 5' coding regions of the gtfB and gtfC genes specifying the streptococcal glucosyltransferases (J.S. Chia, T.Y. Hsu, L.J. Teng, J.Y. Chen, L.J. Hahn, and C.S. Yang, Infect. Immun. 59:1656-1660, 1991). DNA sequence analysis by polymerase chain reaction and direct sequencing revealed that while several nucleotide changes were identified, accounting for the polymorphisms, the amino acids which they code for remain unchanged. The polymorphic region is located in a highly conserved amino terminus of the glucosyltransferases. A peptide of 19 amino acids from this region reversed the inhibiting activity of an antiserum raised against the proteins coded for by the gtfB and gtfC genes. The results suggest that the polymorphic region, varying in DNA but not in amino acid sequences, might specify some biological function.
机译:我们以前已经证明了在指定链球菌葡糖基转移酶的gtfB和gtfC基因的5'编码区存在DNA多态性(JS Chia,TY Hsu,LJ Teng,JY Chen,LJ Hahn和CS Yang,Infect。Immun。59)。 :1656-1660,1991)。通过聚合酶链反应和直接测序进行的DNA序列分析显示,虽然鉴定出几个核苷酸变化,这说明了多态性,但它们编码的氨基酸却保持不变。多态性区域位于葡糖基转移酶的高度保守的氨基末端。来自该区域的19个氨基酸的肽逆转了针对gtfB和gtfC基因编码的蛋白质产生的抗血清的抑制活性。结果表明,DNA变异但氨基酸序列不同的多态性区域可能具有一定的生物学功能。

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