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Crystallization of chicken liver (basic) fatty acid binding protein after purification in multicompartment electrolyzers with isoelectric membranes
Author(s) -
Perduca Massimiliano,
Bossi Alessandra,
Goldoni Luca,
Monaco Hugo L.,
Righetti Pier Giorgio
Publication year - 2000
Publication title -
electrophoresis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.666
H-Index - 158
eISSN - 1522-2683
pISSN - 0173-0835
DOI - 10.1002/1522-2683(20000701)21:12<2316::aid-elps2316>3.0.co;2-0
Subject(s) - isoelectric point , isoelectric focusing , chemistry , fatty acid binding protein , chromatography , membrane , protein purification , biochemistry , gene , enzyme
A preparation of chicken liver (basic) fatty acid binding protein was purified to homogeneity in multicompartment electrolyzers with isoelectric membranes. Large amounts of the isoelectric point (p I ) 9.7 protein were collected into a compartment delimited by p I 8.8 and 11.0 membranes. The protein thus purified produced crystals which diffract to higher resolution than those obtained by purification via preparative isoelectric focusing (IEF) in soluble carrier ampholytes. In addition, a novel orthorhombic form with a different molecular packing was obtained. It is hypothesized that, when using conventional IEF, traces of carrier ampholytes could adhere to the protein, particularly in the hydrophobic ligand‐binding pocket, rendering the interpretation of the electron density maps difficult. Multicompartment electrolyzers do not present this drawback, since they are based on insoluble buffering species.