1okq
From Proteopedia
(New page: 200px<br /><applet load="1okq" size="450" color="white" frame="true" align="right" spinBox="true" caption="1okq, resolution 2.80Å" /> '''LAMININ ALPHA 2 CHAI...) |
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| - | [[Image:1okq.jpg|left|200px]]<br /><applet load="1okq" size=" | + | [[Image:1okq.jpg|left|200px]]<br /><applet load="1okq" size="350" color="white" frame="true" align="right" spinBox="true" |
caption="1okq, resolution 2.80Å" /> | caption="1okq, resolution 2.80Å" /> | ||
'''LAMININ ALPHA 2 CHAIN LG4-5 DOMAIN PAIR, CA1 SITE MUTANT'''<br /> | '''LAMININ ALPHA 2 CHAIN LG4-5 DOMAIN PAIR, CA1 SITE MUTANT'''<br /> | ||
==Overview== | ==Overview== | ||
| - | Laminin-2 (alpha2beta1gamma1) is found in basement membranes surrounding | + | Laminin-2 (alpha2beta1gamma1) is found in basement membranes surrounding muscle and peripheral nerve cells. Several types of cellular receptors bind to the laminin G-like (LG) domains at the C terminus of the alpha2 chain, the interaction with alpha-dystroglycan (alpha-DG) being particularly important in muscle. We have used site-directed mutagenesis and in vitro binding assays to map the binding sites on the laminin alpha2 chain LG4-LG5 domain pair for alpha-DG, heparin and sulfatides. Calcium-dependent alpha-DG recognition requires the calcium ion in LG4, but not the one in LG5, as well as basic residues in both LG domains. Heparin and sulfatides also bind to basic residues in both LG domains, but there is little overlap in the binding sites for alpha-DG and heparin/sulfatides. The results should prove useful for the molecular dissection of laminin-receptor interactions in vivo. |
==About this Structure== | ==About this Structure== | ||
| - | 1OKQ is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Mus_musculus Mus musculus] with CA as [http://en.wikipedia.org/wiki/ligand ligand]. Full crystallographic information is available from [http:// | + | 1OKQ is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Mus_musculus Mus musculus] with <scene name='pdbligand=CA:'>CA</scene> as [http://en.wikipedia.org/wiki/ligand ligand]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1OKQ OCA]. |
==Reference== | ==Reference== | ||
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[[Category: Mus musculus]] | [[Category: Mus musculus]] | ||
[[Category: Single protein]] | [[Category: Single protein]] | ||
| - | [[Category: Friedrich, M | + | [[Category: Friedrich, M V.K.]] |
| - | [[Category: Garbe, J | + | [[Category: Garbe, J H.O.]] |
[[Category: Hohenester, E.]] | [[Category: Hohenester, E.]] | ||
[[Category: Sasaki, T.]] | [[Category: Sasaki, T.]] | ||
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[[Category: metal binding protein]] | [[Category: metal binding protein]] | ||
| - | ''Page seeded by [http:// | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 14:18:55 2008'' |
Revision as of 12:18, 21 February 2008
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LAMININ ALPHA 2 CHAIN LG4-5 DOMAIN PAIR, CA1 SITE MUTANT
Overview
Laminin-2 (alpha2beta1gamma1) is found in basement membranes surrounding muscle and peripheral nerve cells. Several types of cellular receptors bind to the laminin G-like (LG) domains at the C terminus of the alpha2 chain, the interaction with alpha-dystroglycan (alpha-DG) being particularly important in muscle. We have used site-directed mutagenesis and in vitro binding assays to map the binding sites on the laminin alpha2 chain LG4-LG5 domain pair for alpha-DG, heparin and sulfatides. Calcium-dependent alpha-DG recognition requires the calcium ion in LG4, but not the one in LG5, as well as basic residues in both LG domains. Heparin and sulfatides also bind to basic residues in both LG domains, but there is little overlap in the binding sites for alpha-DG and heparin/sulfatides. The results should prove useful for the molecular dissection of laminin-receptor interactions in vivo.
About this Structure
1OKQ is a Single protein structure of sequence from Mus musculus with as ligand. Full crystallographic information is available from OCA.
Reference
Distinct requirements for heparin and alpha-dystroglycan binding revealed by structure-based mutagenesis of the laminin alpha2 LG4-LG5 domain pair., Wizemann H, Garbe JH, Friedrich MV, Timpl R, Sasaki T, Hohenester E, J Mol Biol. 2003 Sep 19;332(3):635-42. PMID:12963372
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