Identification of Hyaluronan-binding Domains of Aggrecan*

Identification of Hyaluronan-binding Domains of Aggrecan*
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聚蛋白聚糖透明质酸结合域的鉴定*

DOI:
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发表时间:
1997
影响因子:
4.8
通讯作者:
Yoshihiko Yamada
Yoshihiko Yamada
中科院分区:
生物学2区
文献类型:
--
作者:
H. Watanabe;S. Cheung;N. Itano;K. Kimata;Yoshihiko Yamada

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聚集蛋白是一种大的软骨蛋白多糖,与透明质酸(HA)相互作用,形成具有抵抗关节受压功能的聚集体。聚集蛋白的n端区域包含两个结构相关的球状结构域,G1和G2被IGD结构域分开。G1结构域由三个子结构域A、B和B′组成,其结构特征与许多其他ha结合蛋白聚糖相似。在这里,我们使用在293细胞(一种胚胎肾细胞系)中表达的重组蛋白研究了聚集蛋白结构域与HA的相互作用。重组聚集蛋白片段的去糖基化降低了HA的结合活性。我们发现B和B ‘子域都是HA绑定所必需的,并且a, B或B ’的单个模块无法绑定HA。A子结构域增加了B-B′区的HA结合活性。G2结构域没有HA结合活性,证实了之前的报道。利用BIAcoreTM生物传感器系统对ha结合特性进行研究发现,由G1、IGD和G2组成的重组聚集蛋白片段(AgW)的K D值为0.226 μm,而另一种ha结合蛋白——天然牛链接蛋白的K D值为0.089 μm。而缺少亚结构域A的AgMut11则表现出很少的HA结合活性。仅含有B-B ‘的AgMut12的亲和力比AgW低3.4倍,含有a -B-B ’的AgMut13的亲和力比AgW低1.5倍。这些结果表明,碳水化合物是高水平聚集蛋白与HA结合所必需的,并且聚集蛋白的A子结构域与B和B’子结构域协同作用。
Aggrecan, a large cartilage proteoglycan, interacts with hyaluronan (HA), to form aggregates which function to resist compression in joints. The N-terminal region of aggrecan contains two structurally related globular domains, G1 and G2 separated by IGD domain. The G1 domain consists of three subdomains, A, B, and B′, structural features characteristic to many other HA-binding proteoglycans. Here, we studied the interaction of aggrecan domains with HA using recombinant proteins expressed in 293 cells, an embryonal kidney cell line. Deglycosylation of the recombinant aggrecan fragment reduced the HA binding activity. We found that both the B and B′ subdomains were required for HA binding and that a single module of A, B, or B′ was unable to bind HA. The A subdomain increased the HA binding activity of the B-B′ region. The G2 domain had no HA binding activity confirming previous reports. Studies of HA-binding properties using a BIAcoreTM biosensor system revealed that the K D of recombinant aggrecan fragment (AgW) consisting of G1, IGD, and G2 was 0.226 μm, whereas the K D of another HA-binding protein, native bovine link protein, is 0.089 μm. In contrast, AgMut11 which lacked subdomain A showed little HA binding activity. AgMut12 consisting of only B-B′ had a 3.4-fold lower affinity and AgMut13 containing A-B-B′ was 1.5-fold lower than AgW. These results suggest that carbohydrates are essential for high level aggrecan binding to HA and that the A subdomain of aggrecan functions in a cooperative manner with subdomains B and B′.
DOI: 10.1002/j.1460-2075.1989.tb08447.x
发表时间: 1989-10
期刊: The EMBO Journal
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作者:
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发表时间: 1995
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发表时间: 1992-09
期刊: The Journal of biological chemistry
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DOI: --
发表时间: 1990
期刊: The Journal of biological chemistry
影响因子: --
作者:
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DOI: --
发表时间: 1995
期刊: BioTechniques
影响因子: 2.7
作者:
Yu,Q;Toole,BP
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