化学
整合素
胶原受体
血小板
血小板活化
阿尔法(金融)
Ⅰ型胶原
三螺旋
BETA(编程语言)
肽
受体
生物化学
立体化学
免疫学
内分泌学
生物
护理部
患者满意度
程序设计语言
医学
结构效度
计算机科学
作者
Michael J. Barnes,Christopher G. Knight,Richard W. Farndale
出处
期刊:Biopolymers
[Wiley]
日期:1996-01-01
卷期号:40 (4): 383-397
被引量:32
标识
DOI:10.1002/(sici)1097-0282(1996)40:4<383::aid-bip4>3.0.co;2-s
摘要
Simple collagen-like peptides comprising a repeat Gly-Pro-Hyp sequence are highly platelet-reactive when presented to platelets in triple-helical and polymeric form. This activity is not mediated by the platelet collagen receptor integrin alpha 2 beta 1. This may imply the existence of an intrinsic platelet reactivity associated with the collagen triple helix as such or perhaps that the Gly-Pro-Hyp sequence in collagen serves as a specific cell-recognition site. In our view this basic alpha 2 beta 1-independent reactivity is modulated by the presence in collagen of sequences that may either enhance or diminish the interaction with platelets. Inhibition studies with short linear peptides have allowed the tentative identification of sequences in collagen such as XPGEP(Q)GPX and D(N)GE(Q)X that may promote the activation of platelets and so enhance collagen-platelet interaction. Sequences serving as integrin alpha 2 beta 1-binding sites may also promote platelet reactivity by permitting interaction with the collagen receptor. Using triple-helical peptides based on the sequence of the platelet-reactive collagen type III fragment alpha 1(III)CB4, we have been able to locate an alpha 2 beta 1-binding site in collagen type III within a 30-mer sequence representing residues 508-537 of the alpha 1(III) constituent alpha-chain. Despite their alpha 2 beta 1-independent platelet reactivity, signalling by the (Gly-Pro-Hyp)n-based peptides shows many features in common with signalling by collagen fibers, including activation of p72SYK and p125FAK the latter of which has until now been considered a specific consequence of ligand binding to alpha 2 beta 1.
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