1mgx
From Proteopedia
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|PDB= 1mgx |SIZE=350|CAPTION= <scene name='initialview01'>1mgx</scene> | |PDB= 1mgx |SIZE=350|CAPTION= <scene name='initialview01'>1mgx</scene> | ||
|SITE= | |SITE= | ||
| - | |LIGAND= | + | |LIGAND= <scene name='pdbligand=CGU:GAMMA-CARBOXY-GLUTAMIC+ACID'>CGU</scene> |
| - | |ACTIVITY= [http://en.wikipedia.org/wiki/Coagulation_factor_IXa Coagulation factor IXa], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.4.21.22 3.4.21.22] | + | |ACTIVITY= <span class='plainlinks'>[http://en.wikipedia.org/wiki/Coagulation_factor_IXa Coagulation factor IXa], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.4.21.22 3.4.21.22] </span> |
|GENE= | |GENE= | ||
| + | |DOMAIN= | ||
| + | |RELATEDENTRY= | ||
| + | |RESOURCES=<span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1mgx FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1mgx OCA], [http://www.ebi.ac.uk/pdbsum/1mgx PDBsum], [http://www.rcsb.org/pdb/explore.do?structureId=1mgx RCSB]</span> | ||
}} | }} | ||
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==Overview== | ==Overview== | ||
The blood coagulation and regulatory proteins that contain gamma-carboxyglutamic acid are a part of a unique class of membrane binding proteins that require calcium for their interaction with cell membranes. Following protein biosynthesis, glutamic acids on these proteins are converted to gamma-carboxyglutamic acid (Gla) in a reaction that requires vitamin K as a cofactor. The vitamin K-dependent proteins undergo a conformational transition upon metal ion binding, but only calcium ions mediate protein-phospholipid interaction. To identify the site on Factor IX that is required for phospholipid binding, we have determined the three-dimensional structure of the Factor IX Gla domain bound to magnesium ions by NMR spectroscopy. By comparison of this structure to that of the Gla domain bound to calcium ions, we localize the membrane binding site to a highly ordered structure including residues 1-11 of the Gla domain. In the presence of Ca2+, Factor IX Gla domain peptides that contain the photoactivatable amino acid p-benzoyl-L-phenylalanine at positions 6 or 9 cross-link to phospholipid following irradiation, while peptides lacking this amino acid analog or with this analog at position 46 did not cross-link. These results indicate that the NH2 terminus of the Gla domain, specifically including leucine 6 and phenylalanine 9 in the hydrophobic patch, is the contact surface on Factor IX that interacts with the phospholipid bilayer. | The blood coagulation and regulatory proteins that contain gamma-carboxyglutamic acid are a part of a unique class of membrane binding proteins that require calcium for their interaction with cell membranes. Following protein biosynthesis, glutamic acids on these proteins are converted to gamma-carboxyglutamic acid (Gla) in a reaction that requires vitamin K as a cofactor. The vitamin K-dependent proteins undergo a conformational transition upon metal ion binding, but only calcium ions mediate protein-phospholipid interaction. To identify the site on Factor IX that is required for phospholipid binding, we have determined the three-dimensional structure of the Factor IX Gla domain bound to magnesium ions by NMR spectroscopy. By comparison of this structure to that of the Gla domain bound to calcium ions, we localize the membrane binding site to a highly ordered structure including residues 1-11 of the Gla domain. In the presence of Ca2+, Factor IX Gla domain peptides that contain the photoactivatable amino acid p-benzoyl-L-phenylalanine at positions 6 or 9 cross-link to phospholipid following irradiation, while peptides lacking this amino acid analog or with this analog at position 46 did not cross-link. These results indicate that the NH2 terminus of the Gla domain, specifically including leucine 6 and phenylalanine 9 in the hydrophobic patch, is the contact surface on Factor IX that interacts with the phospholipid bilayer. | ||
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| - | ==Disease== | ||
| - | Known diseases associated with this structure: Hemophilia B OMIM:[[http://www.ncbi.nlm.nih.gov/entrez/dispomim.cgi?id=306900 306900]], Warfarin sensitivity OMIM:[[http://www.ncbi.nlm.nih.gov/entrez/dispomim.cgi?id=306900 306900]] | ||
==About this Structure== | ==About this Structure== | ||
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[[Category: signal]] | [[Category: signal]] | ||
| - | ''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 22:15:57 2008'' |
Revision as of 19:15, 30 March 2008
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| Ligands: | |||||||
| Activity: | Coagulation factor IXa, with EC number 3.4.21.22 | ||||||
| Resources: | FirstGlance, OCA, PDBsum, RCSB | ||||||
| Coordinates: | save as pdb, mmCIF, xml | ||||||
COAGULATION FACTOR, MG(II), NMR, 7 STRUCTURES (BACKBONE ATOMS ONLY)
Overview
The blood coagulation and regulatory proteins that contain gamma-carboxyglutamic acid are a part of a unique class of membrane binding proteins that require calcium for their interaction with cell membranes. Following protein biosynthesis, glutamic acids on these proteins are converted to gamma-carboxyglutamic acid (Gla) in a reaction that requires vitamin K as a cofactor. The vitamin K-dependent proteins undergo a conformational transition upon metal ion binding, but only calcium ions mediate protein-phospholipid interaction. To identify the site on Factor IX that is required for phospholipid binding, we have determined the three-dimensional structure of the Factor IX Gla domain bound to magnesium ions by NMR spectroscopy. By comparison of this structure to that of the Gla domain bound to calcium ions, we localize the membrane binding site to a highly ordered structure including residues 1-11 of the Gla domain. In the presence of Ca2+, Factor IX Gla domain peptides that contain the photoactivatable amino acid p-benzoyl-L-phenylalanine at positions 6 or 9 cross-link to phospholipid following irradiation, while peptides lacking this amino acid analog or with this analog at position 46 did not cross-link. These results indicate that the NH2 terminus of the Gla domain, specifically including leucine 6 and phenylalanine 9 in the hydrophobic patch, is the contact surface on Factor IX that interacts with the phospholipid bilayer.
About this Structure
1MGX is a Single protein structure of sequence from Homo sapiens. Full crystallographic information is available from OCA.
Reference
Identification of the phospholipid binding site in the vitamin K-dependent blood coagulation protein factor IX., Freedman SJ, Blostein MD, Baleja JD, Jacobs M, Furie BC, Furie B, J Biol Chem. 1996 Jul 5;271(27):16227-36. PMID:8663165
Page seeded by OCA on Sun Mar 30 22:15:57 2008
