Proteoglycan-specific molecular switch for RPTPσ clustering and neuronal extension.

Proteoglycan-specific molecular switch for RPTPσ clustering and neuronal extension.
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DOI:
10.1126/science.1200840
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发表时间:
2011-04-22
期刊:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
Aricescu AR
Aricescu AR
中科院分区:
其他
文献类型:
--
作者:
Coles CH;Shen Y;Tenney AP;Siebold C;Sutton GC;Lu W;Gallagher JT;Jones EY;Flanagan JG;Aricescu AR

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Heparan and chondroitin sulfate proteoglycans (HSPGs and CSPGs, respectively) regulate numerous cell surface signaling events, with typically opposite effects on cell function. CSPGs inhibit nerve regeneration through receptor protein tyrosine phosphatase sigma (RPTPs). Here we report that RPTPs acts bimodally in sensory neuron extension, mediating CSPG inhibition and HSPG growth promotion. Crystallographic analyses of a shared HSPG-CSPG binding site reveal a conformational plasticity that can accommodate diverse glycosaminoglycans with comparable affinities. Heparan sulfate and analogs induced RPTPs ectodomain oligomerization in solution, which was inhibited by chondroitin sulfate. RPTPs and HSPGs colocalize in puncta on sensory neurons in culture, whereas CSPGs occupy the extracellular matrix. These results lead to a model where proteoglycans can exert opposing effects on neuronal extension by competing to control the oligomerization of a common receptor.
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