The structure of a family 168 glycoside hydrolase from the marine bacterium Muricauda eckloniae

IF 1.1 4区 生物学 Q4 BIOCHEMICAL RESEARCH METHODS
Emily Knudson-Goerner, Alisdair B. Boraston
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引用次数: 0

Abstract

The genome of the marine bacterium Muricauda eckloniae sp. DK169 contains an extensive polysaccharide-utilization locus that targets fucoidan from brown algae. Within this locus is a gene that encodes a putative fucoidan-degrading glycoside hydrolase (locus tag AAY42_01205) assigned to glycoside hydrolase family 168, which we call MeGH168. We present the 2.0 Å resolution X-ray crystal structure of MeGH168, demonstrating a (β/α)8-barrel fold. The eight loop regions joining each α-helix and β-strand surround the catalytic groove. A comparison with the structure of a GH168, Fun168A, in complex with a fragment of fucoidan (PDB entry 8ya7) revealed conservation of key residues in the catalytic site. However, structural variation in positive-subsite loop regions may recontour the active site to create differences in substrate specificity between the two GH168s. The present data provide additional structural insights into the GH168 family, particularly expanding on sequence and structure conservation (and the lack thereof) in relation to substrate interactions.

Abstract Image

海洋细菌Muricauda eckloniae家族168糖苷水解酶的结构。
海洋细菌Muricauda eckloniae sp. DK169的基因组包含一个广泛的多糖利用位点,其目标是来自褐藻的岩藻聚糖。在这个基因座中,有一个基因编码一种推测的降解岩藻糖苷的糖苷水解酶(基因座标签AAY42_01205),该酶属于糖苷水解酶家族168,我们称之为MeGH168。我们展示了2.0 Å分辨率的MeGH168 x射线晶体结构,显示出(β/α)8桶折叠。连接α-螺旋和β-链的8个环区围绕着催化槽。与GH168的结构比较,Fun168A与岩藻聚糖片段(PDB入口8ya7)的配合物显示了催化位点的关键残基的保守性。然而,正子位环区域的结构变化可能会重塑活性位点,从而在两种gh168之间产生底物特异性的差异。目前的数据为GH168家族提供了额外的结构见解,特别是扩展了与底物相互作用相关的序列和结构保护(以及缺乏)。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Acta crystallographica. Section F, Structural biology communications
Acta crystallographica. Section F, Structural biology communications BIOCHEMICAL RESEARCH METHODSBIOCHEMISTRY &-BIOCHEMISTRY & MOLECULAR BIOLOGY
CiteScore
1.90
自引率
0.00%
发文量
95
期刊介绍: Acta Crystallographica Section F is a rapid structural biology communications journal. Articles on any aspect of structural biology, including structures determined using high-throughput methods or from iterative studies such as those used in the pharmaceutical industry, are welcomed by the journal. The journal offers the option of open access, and all communications benefit from unlimited free use of colour illustrations and no page charges. Authors are encouraged to submit multimedia content for publication with their articles. Acta Cryst. F has a dedicated online tool called publBio that is designed to make the preparation and submission of articles easier for authors.
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