1ncf

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{{STRUCTURE_1ncf| PDB=1ncf | SCENE= }}
{{STRUCTURE_1ncf| PDB=1ncf | SCENE= }}
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'''A NEW PARADIGM FOR TUMOR NECROSIS FACTOR SIGNALLING'''
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===A NEW PARADIGM FOR TUMOR NECROSIS FACTOR SIGNALLING===
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==Overview==
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Activation of the cell surface receptors for tumor necrosis factor (TNF) is effected by the aggregation of cytoplasmic domains that occurs when the extracellular domains of two or three receptors bind to trimeric TNF alpha or TNF beta. The structure of the type I TNF receptor extracellular domain (sTNF-R1), crystallized in the absence of TNF, has now been determined at 2.25-A resolution. The receptor itself is an elongated molecule comprising four disulfide-rich domains in a nearly linear array. Contrary to expectations, the unliganded domains are found to associate into dimers of two distinct types, in which monomers are related by local two-fold axes of symmetry. In one case, the receptors are antiparallel to each other and associate through an interface that overlaps the TNF binding site. If intact receptors were capable of such an association, their cytoplasmic domains would be separated by over 100 A. This interaction could inhibit signaling in the absence of TNF. Parallel dimers are also observed in which the dimer interface is well separated from the TNF binding site. Associations among TNF-bound parallel dimers could cause receptor clustering. Both dimers bury substantial areas of protein surface and are formed by polar and non-polar interactions.
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(as it appears on PubMed at http://www.pubmed.gov), where 7768931 is the PubMed ID number.
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{{ABSTRACT_PUBMED_7768931}}
==About this Structure==
==About this Structure==
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[[Category: Binding protein]]
[[Category: Binding protein]]
[[Category: Cytokine]]
[[Category: Cytokine]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 02:22:03 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 29 13:13:37 2008''

Revision as of 10:13, 29 July 2008

Image:1ncf.png

Template:STRUCTURE 1ncf

A NEW PARADIGM FOR TUMOR NECROSIS FACTOR SIGNALLING

Template:ABSTRACT PUBMED 7768931

About this Structure

1NCF is a Single protein structure of sequence from Homo sapiens. Full crystallographic information is available from OCA.

Reference

Crystallographic evidence for dimerization of unliganded tumor necrosis factor receptor., Naismith JH, Devine TQ, Brandhuber BJ, Sprang SR, J Biol Chem. 1995 Jun 2;270(22):13303-7. PMID:7768931

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