1rmj: Difference between revisions

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[[Image:1rmj.gif|left|200px]]
{{Seed}}
[[Image:1rmj.png|left|200px]]


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{{STRUCTURE_1rmj|  PDB=1rmj  |  SCENE=  }}  
{{STRUCTURE_1rmj|  PDB=1rmj  |  SCENE=  }}  


'''C-terminal domain of insulin-like growth factor (IGF) binding protein-6: structure and interaction with IGF-II'''
===C-terminal domain of insulin-like growth factor (IGF) binding protein-6: structure and interaction with IGF-II===




==Overview==
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IGFs are important mediators of growth. IGF binding proteins (IGFBPs) 1-6 regulate IGF actions and have IGF-independent actions. The C-terminal domains of IGFBPs contribute to high-affinity IGF binding and modulation of IGF actions and confer some IGF-independent properties, but understanding how they achieve this has been constrained by the lack of a three-dimensional structure. We therefore determined the solution structure of the C-domain of IGFBP-6 using nuclear magnetic resonance (NMR). The domain consists of a thyroglobulin type 1 fold comprising an alpha-helix followed by a loop, a three-stranded antiparallel beta-sheet incorporating a second loop, and finally a disulfide-bonded flexible third loop. The IGF-II binding site on the C-domain was identified by examining NMR spectral changes upon complex formation. It consists of a largely hydrophobic surface patch involving the alpha-helix, the first beta-strand, and the first and second loops. The site was confirmed by mutagenesis of several residues, which resulted in decreased IGF binding affinity. The IGF-II binding site lies adjacent to surfaces likely to be involved in glycosaminoglycan binding of IGFBPs, which might explain their decreased IGF affinity when bound to glycosaminoglycans, and nuclear localization. Our structure provides a framework for understanding the roles of IGFBP C-domains in modulating IGF actions and conferring IGF-independent actions, as well as ultimately for the development of therapeutic IGF inhibitors for diseases including cancer.
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{{ABSTRACT_PUBMED_15308688}}


==About this Structure==
==About this Structure==
1RMJ is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1RMJ OCA].  
1RMJ is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1RMJ OCA].  


==Reference==
==Reference==
C-terminal domain of insulin-like growth factor (IGF) binding protein-6: structure and interaction with IGF-II., Headey SJ, Keizer DW, Yao S, Brasier G, Kantharidis P, Bach LA, Norton RS, Mol Endocrinol. 2004 Nov;18(11):2740-50. Epub 2004 Aug 12. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/15308688 15308688]
C-terminal domain of insulin-like growth factor (IGF) binding protein-6: structure and interaction with IGF-II., Headey SJ, Keizer DW, Yao S, Brasier G, Kantharidis P, Bach LA, Norton RS, Mol Endocrinol. 2004 Nov;18(11):2740-50. Epub 2004 Aug 12. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/15308688 15308688]
Binding site for the C-domain of insulin-like growth factor (IGF) binding protein-6 on IGF-II; implications for inhibition of IGF actions., Headey SJ, Keizer DW, Yao S, Wallace JC, Bach LA, Norton RS, FEBS Lett. 2004 Jun 18;568(1-3):19-22. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/15196913 15196913]
[[Category: Homo sapiens]]
[[Category: Homo sapiens]]
[[Category: Single protein]]
[[Category: Single protein]]
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[[Category: Yao, S.]]
[[Category: Yao, S.]]
[[Category: Insulin-like growth factor binding protein]]
[[Category: Insulin-like growth factor binding protein]]
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