晨间信号Morning Signal
《科学》 第393卷 第6812期 · 2026年8月13日 · 中文解读

肌营养不良聚糖的木糖磷酸酶活性自我调节其受体功能

Xylose phosphatase activity of dystroglycan self-regulates its receptor function · I. Chandel et al.
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本文发现肌营养不良聚糖的N端结构域具有木糖磷酸酶活性,通过去除木糖激酶FAM20B添加的磷酸基团来调控matriglycan链的长度,从而影响其受体功能。
原文开头
Ishita Chandel1, David Venzke1, Bailey A. Wollesen1, Liping Yu2, Kevin P. Campbell1* Dystroglycan (Dg) is an extracellular matrix receptor crucial for tissue development and pathogen entry. Dg harbors a long, complex glycan called matriglycan. Loss of matriglycan or reduction in its length disrupts Dg function, causing dystroglycanopathies. However, the mechanism regulating matriglycan length is unknown. In this study, we found that a xylose kinase facilitated the initiation of matriglycan synthesis by adding a phosphate to the xylose of the matriglycan primer. Matriglycan elongation occurred when the phosphate was removed by the N-terminal domain of Dg (DgN). DgN has the conserved DXDXt/V active site motif found in haloacid dehalogenase domains of phosphohydrolases. …
摘自《科学》(Science)第393卷 第6812期 · 2026年8月13日,I. Chandel et al.。仅引用开头一小段供了解文章,版权归原刊所有,全文请阅读原刊。
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