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Crystallization and preliminary X-ray study of two liver basic fatty acid-binding proteins.
S M Di Pietro1, M Perduca, J A Santomé
1Instituto de Química y Fisicoquímica Biológicas, Facultad de Farmacia y Bioquímica, Universidad de Buenos Aires, Junín 956, Buenos Aires 1113, Argentina.
Acta Crystallographica. Section D, Biological Crystallography
|November 22, 2001
Summary
Fatty acid-binding proteins (FABPs) research reveals structural differences between liver basic FABPs (Lb-FABPs) and mammalian liver FABPs (L-FABPs). This study
Area of Science:
- Biochemistry
- Structural Biology
- Protein Science
Background:
- Fatty acid-binding proteins (FABPs) are a well-known protein family.
- Liver basic FABPs (Lb-FABPs) are a subgroup found in vertebrates, distinct from mammalian liver FABPs (L-FABPs).
- A key difference lies in ligand binding stoichiometry: L-FABPs bind two fatty acids, while Lb-FABPs bind one.
Purpose of the Study:
- To resolve the structural details of ligand binding in Lb-FABPs.
- To clarify the structural differences between Lb-FABPs and L-FABPs.
- To explain the observed variations in fatty acid binding stoichiometry.
Main Methods:
- Crystallization of axolotl Lb-FABP and toad Lb-FABP.
- X-ray diffraction analysis of the protein crystals.
- Determination of unit-cell parameters and diffraction resolution.
Main Results:
- Crystals of axolotl Lb-FABP (space group P4(1)2(1)2 or P4(3)2(1)2) diffract to 2.0 A resolution.
- Crystals of toad Lb-FABP (space group P4(1)22 or P4(3)22) diffract to 2.5 A resolution.
- These are the second and third Lb-FABP members crystallized, providing new structural data.
Conclusions:
- The determined structures are expected to elucidate the structural distinctions between Lb-FABPs and L-FABPs.
- The findings may explain the differing fatty acid binding capacities of these protein subfamilies.
- This research advances the understanding of FABP structure-function relationships.