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'''REFINED APOPROTEIN STRUCTURE OF RAT INTESTINAL FATTY ACID BINDING PROTEIN PRODUCED IN ESCHERICHIA COLI''' | '''REFINED APOPROTEIN STRUCTURE OF RAT INTESTINAL FATTY ACID BINDING PROTEIN PRODUCED IN ESCHERICHIA COLI''' | ||
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[[Category: Gordon, J I.]] | [[Category: Gordon, J I.]] | ||
[[Category: Sacchettini, J C.]] | [[Category: Sacchettini, J C.]] | ||
[[Category: | [[Category: Fatty acid-binding protein]] | ||
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May 2 19:56:31 2008'' | |||
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on | |||
Revision as of 19:56, 2 May 2008
REFINED APOPROTEIN STRUCTURE OF RAT INTESTINAL FATTY ACID BINDING PROTEIN PRODUCED IN ESCHERICHIA COLI
OverviewOverview
Rat intestinal fatty acid binding protein (I-FABP) is a member of a family of cytoplasmic hydrophobic ligand-binding proteins. To gain insights about the contribution of bound fatty acid to I-FABP's conformation and mechanism of ligand binding, we have determined the structure of Escherichia coli-derived rat apo-I-FABP to 1.96-A resolution and compared it to the recently refined structure of I-FABP with bound palmitate. Both apo- and holo-I-FABP are composed primarily of anti-parallel beta-strands which form two nearly orthogonal beta-sheets ("beta-clam"). The overall structures of the apo- and holo-I-FABP are nearly identical, with a root mean square (rms) difference of 0.37 A between C alpha atoms, 0.38 A between all main-chain atoms, and 0.94 A between all side-chain atoms. However, rms differences of greater than 1.3 A were noted for the side chains of Ile-23, Lys-27, Arg-56, Leu-72, Ala-73, and Asp-74. The space occupied by bound ligand in the core of the holoprotein is occupied in the apo-protein by ordered solvent molecules. This results in an increase in the total number of internal ordered solvent molecules from 7 in the holoprotein to 13 in apo-I-FABP. This finding, together with observed differences in the side-chain orientations of two residues (Arg-56 and Lys-27) situated over a potential opening to the cores of the apo- and holoproteins, suggests that solvent molecules play a critical role in ligand binding. Moreover, the data indicate that the beta-clam structure is stable even in the absence of bound ligand.
About this StructureAbout this Structure
1IFB is a Single protein structure of sequence from Rattus norvegicus. Full crystallographic information is available from OCA.
ReferenceReference
Refined apoprotein structure of rat intestinal fatty acid binding protein produced in Escherichia coli., Sacchettini JC, Gordon JI, Banaszak LJ, Proc Natl Acad Sci U S A. 1989 Oct;86(20):7736-40. PMID:2682622 Page seeded by OCA on Fri May 2 19:56:31 2008