1mq8: Difference between revisions
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|PDB= 1mq8 |SIZE=350|CAPTION= <scene name='initialview01'>1mq8</scene>, resolution 3.30Å | |PDB= 1mq8 |SIZE=350|CAPTION= <scene name='initialview01'>1mq8</scene>, resolution 3.30Å | ||
|SITE= | |SITE= | ||
|LIGAND= <scene name='pdbligand= | |LIGAND= <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene>, <scene name='pdbligand=NAG:N-ACETYL-D-GLUCOSAMINE'>NAG</scene> | ||
|ACTIVITY= | |ACTIVITY= | ||
|GENE= ICAM-1 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=9606 Homo sapiens]), LFA-1 (AlphaLbeta2) ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=9606 Homo sapiens]) | |GENE= ICAM-1 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=9606 Homo sapiens]), LFA-1 (AlphaLbeta2) ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=9606 Homo sapiens]) | ||
|DOMAIN= | |||
|RELATEDENTRY=[[1mq9|1MQ9]], [[1mqa|1MQA]] | |||
|RESOURCES=<span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1mq8 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1mq8 OCA], [http://www.ebi.ac.uk/pdbsum/1mq8 PDBsum], [http://www.rcsb.org/pdb/explore.do?structureId=1mq8 RCSB]</span> | |||
}} | }} | ||
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==Overview== | ==Overview== | ||
The structure of the I domain of integrin alpha L beta 2 bound to the Ig superfamily ligand ICAM-1 reveals the open ligand binding conformation and the first example of an integrin-IgSF interface. The I domain Mg2+ directly coordinates Glu-34 of ICAM-1, and a dramatic swing of I domain residue Glu-241 enables a critical salt bridge. Liganded and unliganded structures for both high- and intermediate-affinity mutant I domains reveal that ligand binding can induce conformational change in the alpha L I domain and that allosteric signals can convert the closed conformation to intermediate or open conformations without ligand binding. Pulling down on the C-terminal alpha 7 helix with introduced disulfide bonds ratchets the beta 6-alpha 7 loop into three different positions in the closed, intermediate, and open conformations, with a progressive increase in affinity. | The structure of the I domain of integrin alpha L beta 2 bound to the Ig superfamily ligand ICAM-1 reveals the open ligand binding conformation and the first example of an integrin-IgSF interface. The I domain Mg2+ directly coordinates Glu-34 of ICAM-1, and a dramatic swing of I domain residue Glu-241 enables a critical salt bridge. Liganded and unliganded structures for both high- and intermediate-affinity mutant I domains reveal that ligand binding can induce conformational change in the alpha L I domain and that allosteric signals can convert the closed conformation to intermediate or open conformations without ligand binding. Pulling down on the C-terminal alpha 7 helix with introduced disulfide bonds ratchets the beta 6-alpha 7 loop into three different positions in the closed, intermediate, and open conformations, with a progressive increase in affinity. | ||
==About this Structure== | ==About this Structure== | ||
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[[Category: Yang, Y.]] | [[Category: Yang, Y.]] | ||
[[Category: Zhang, R.]] | [[Category: Zhang, R.]] | ||
[[Category: ig superfamily]] | [[Category: ig superfamily]] | ||
[[Category: metal mediated protein interface]] | [[Category: metal mediated protein interface]] | ||
[[Category: rossmann fold]] | [[Category: rossmann fold]] | ||
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun Mar 30 22:19:38 2008'' | ||
