对细菌GH31α-galactosidases的结构功能分析,这些细菌对α-(1→4)-galactobiose具有特异性
Marina Ikegaya1, Enoch Y Park1,2, Takatsugu Miyazaki1,2
1Department of Bioscience, Graduate School of Science and Technology, Shizuoka University, Japan.
The FEBS journal
|July 13, 2023
概括
研究人员特征了两个细菌α-galactosidases,BsGH31_19和FpGH31_19,揭示了它们对α-(1->4) 链路的特定活性. 结构分析提供了对31α-galactosidases. glycoside hydrolase家族31α-galactosidases分子多样性和演变的见解.
科学领域:
- 生物化学 生物化学
- 结构生物学 结构生物学
- 酶学 是一种酶学.
背景情况:
- 甘氨酸酸酶家族31 (GH31) 包含具有不同基质特异性的α-甘氨酸酸酶.
- GH31最近根据序列相似性网络被分为20个子家族.
- 19亚家族中的Bacteroides salyersiae (BsGH31_19) 的一个α-galactosidase对合成基质表现出活性,但其天然基质是未知的.
研究的目的:
- 要鉴定BsGH31_19及其来自Flavihumibacter petaseus.的正统类型FpGH31_19的特征.
- 为了确定这些GH31α-galactosidases的基质特异性和结构特征.
- 阐明GH31和其他α-银酸酶家族中的分子多样性和进化关系.
主要方法:
- BsGH31_19和FpGH31_19.的生物化学表征
- 酶的晶体分析,包括含基质的复杂结构.
- 与已知的GH31和其他alpha-galactosidases的序列和结构比较.
主要成果:
- BsGH31_19和FpGH31_19在α-(1->4) - 中表现出高基质特异性,对α-(1->4) - 链接具有高特异性.
- 与其他GH31成员 (如PsGal31A) 相比,这些酶形成具有明显接口的二元体.
- 结构分析显示了BsGH31_19和FpGH31_19之间涉及基质识别的关键氨基酸残留的变异,以及Trp153与其他α-galactosidases的同质性,但不是PsGal31A.
结论:
- BsGH31_19和FpGH31_19具有独特的基质特异性,与之前描述的GH31α-galactosidases不同.
- 结构数据提供了关于GH31亚家族19和不同的α-银酸酶家族内的进化差异的见解.
- 这项研究突出显示了甘氨酸酸酶的分子多样性和进化可塑性.
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