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2ifb

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{{STRUCTURE_2ifb| PDB=2ifb | SCENE= }}
{{STRUCTURE_2ifb| PDB=2ifb | SCENE= }}
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'''CRYSTAL STRUCTURE OF RAT INTESTINAL FATTY-ACID-BINDING PROTEIN. REFINEMENT AND ANALYSIS OF THE ESCHERICHIA COLI-DRIVED PROTEIN WITH BOUND PALMITATE'''
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===CRYSTAL STRUCTURE OF RAT INTESTINAL FATTY-ACID-BINDING PROTEIN. REFINEMENT AND ANALYSIS OF THE ESCHERICHIA COLI-DRIVED PROTEIN WITH BOUND PALMITATE===
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==Overview==
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Rat intestinal fatty-acid-binding protein (I-FABP) is a small (15,124 Mr) cytoplasmic polypeptide that binds long-chain fatty acids in a non-covalent fashion. I-FABP is a member of a family of intracellular binding proteins that are thought to participate in the uptake, transport and/or metabolic targeting of hydrophobic ligands. The crystal structure of Escherichia coli-derived rat I-FABP with a single molecule of bound palmitate has been refined to 2 A resolution using a combination of least-squares methods, energy refinement and molecular dynamics. The combined methods resulted in a model with a crystallographic R-factor of 17.8% (7775 reflections, sigma greater than 2.0), root-mean-square bond length deviation of 0.009 A and root-mean-square bond angle deviation of 2.85 degrees. I-FABP contains ten antiparallel beta-strands organized into two approximately orthogonal, beta-sheets. The hydrocarbon tail of its single C16:0 ligand is present in a well-ordered, distinctively bent conformation. The carboxylate group of the fatty acid is located in the interior of I-FABP and forms a unique "quintet" of electrostatic interactions involving Arg106; Gln 115, and two solvent molecules. The hydrocarbon tail is bent with a slight left-handed helical twist from the carboxylate group to C-16. The bent methylene chain resides in a "cradle" formed by the side-chains of hydrophobic, mainly aromatic, amino acid residues. The refined molecular model of holo-I-FABP suggests several potential locations for entry and exiting of the fatty acid.
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{{ABSTRACT_PUBMED_2671390}}
==About this Structure==
==About this Structure==
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[[Category: Sacchettini, J C.]]
[[Category: Sacchettini, J C.]]
[[Category: Fatty acid-binding protein]]
[[Category: Fatty acid-binding protein]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 29 07:51:28 2008''

Revision as of 04:51, 29 July 2008

Image:2ifb.png

Template:STRUCTURE 2ifb

CRYSTAL STRUCTURE OF RAT INTESTINAL FATTY-ACID-BINDING PROTEIN. REFINEMENT AND ANALYSIS OF THE ESCHERICHIA COLI-DRIVED PROTEIN WITH BOUND PALMITATE

Template:ABSTRACT PUBMED 2671390

About this Structure

2IFB is a Single protein structure of sequence from Rattus norvegicus. Full crystallographic information is available from OCA.

Reference

Crystal structure of rat intestinal fatty-acid-binding protein. Refinement and analysis of the Escherichia coli-derived protein with bound palmitate., Sacchettini JC, Gordon JI, Banaszak LJ, J Mol Biol. 1989 Jul 20;208(2):327-39. PMID:2671390

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