A comparative study of the conformational properties of Escherichia coli-derived rat intestinal and liver fatty acid binding proteins

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DOIResolve DOI: http://doi.org/10.1016/0167-4838(93)90293-Z
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TypeArticle
Journal titleBiochimica et Biophysica Acta
Volume1162
Issue3
Pages291296; # of pages: 6
SubjectFatty acid binding protein; Protein conformation; Liver; (Rat)
AbstractFourier transform infrared spectroscopy has been used to examine the conformation in aqueous solution of Escherichia coli-expressed rat intestinal and liver fatty-acid binding proteins (I-FABP and L-FABP, respectively). While I-FABP is known from X-ray analysis to have a predominantly β-structure with 10 antiparallel β-strands forming two orthogonal sheets that surround the ligand binding pocket, no structural data are available for L-FABP. As expected for homologous proteins with related functions, the secondary structures of I-FABP and I-FABP are very similar. In both proteins, the conformation-sensitive amide-I band shows the maximum absorption at around 1630 cm−1, proving that β-sheet is the major structural element. However, there are three critical differences between I-FABP and L-FABP; (i), a different solvent accessibility of the protein backbone; (ii), a different pH sensitivity and (iii), a different thermostability, with L-FABP being thermally more stable than I-FABP. These results suggest that, in spite of having a similar overall conformation, the architecture of these proteins is stabilized by slightly different interactions. Such dissimilarities, well-paralleled by fatty-acid binding studies, may provide a structural basis for their functional diversification.
Publication date
PublisherElsevier Science Publishers B.V.
LanguageEnglish
AffiliationNational Research Council Canada; NRC Institute for Biodiagnostics
Peer reviewedYes
NRC number73
NPARC number9742151
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Record identifier49f5d21f-47c8-4c7a-bffb-59e9d4121a2c
Record created2009-07-17
Record modified2016-12-12
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