Recognition of xyloglucan by the crystalline cellulose-binding site of a family 3a carbohydrate-binding module.

Recognition of xyloglucan by the crystalline cellulose-binding site of a family 3a carbohydrate-binding module.
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DOI:
10.1016/j.febslet.2015.07.009
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发表时间:
2015-08-19
期刊:
影响因子:
3.5
通讯作者:
Knox JP
Knox JP
中科院分区:
生物学3区
文献类型:
--
作者:
Hernandez-Gomez MC;Rydahl MG;Rogowski A;Morland C;Cartmell A;Crouch L;Labourel A;Fontes CM;Willats WG;Gilbert HJ;Knox JP

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A型非催化碳水化合物结合模块(CBM),例如CtCBM 3acipA,被广泛认为通过熵力特异性靶向结晶纤维素。在这里,我们已经测试了A型CBM也可以结合木葡聚糖的假设,木葡聚糖是一种含有α-1,6-木糖侧链的可溶性β-1,4-葡聚糖。CtCBM 3acipA与细胞壁中的木葡聚糖结合并排列在固体表面上。木葡聚糖和纤维素显示结合到CBM 3acipA上的相同平面表面。来自不同家族的一系列A型CBM显示出与溶液中的木葡聚糖结合,其中配体结合由构象变化驱动。CBM-多糖相互作用的性质进行了讨论。
Type A non-catalytic carbohydrate-binding modules (CBMs), exemplified by CtCBM3acipA, are widely believed to specifically target crystalline cellulose through entropic forces. Here we have tested the hypothesis that type A CBMs can also bind to xyloglucan, a soluble β-1,4-glucan containing α-1,6-xylose side chains. CtCBM3acipA bound to xyloglucan in cell walls and arrayed on solid surfaces. Xyloglucan and cellulose were shown to bind to the same planar surface on CBM3acipA. A range of type A CBMs from different families were shown to bind to xyloglucan in solution with ligand binding driven by enthalpic changes. The nature of CBM-polysaccharide interactions is discussed.
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