Pseudo-affinity chromatographic approach to probe heterogeneity in buffalo pituitary luteinizing hormone: probable pseudolectin-like behavior of immobilized Cibacron Blue 3GA.
J Chromatogr B Analyt Technol Biomed Life Sci 2010;
878:2679-84. [PMID:
20846911 DOI:
10.1016/j.jchromb.2010.07.025]
[Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2010] [Revised: 07/28/2010] [Accepted: 07/29/2010] [Indexed: 11/21/2022]
Abstract
The alpha (α) and beta (β) subunits of buffalo pituitary luteinizing hormone (LH) were chromatographed on Cibacron Blue 3GA agarose and their immunoreactivity was quantitated using anti-α and anti-β anti sera. Subsequent analyses showed α subunits were relatively more hydrophilic than β subunits. Further, the naturally occurring free α and β subunits were more hydrophobic than their native counterparts which were dissociated and isolated from heterodimeric LH. The lesser sugar content in freely occurring α and beta subunits may be attributed for increased hydrophobicity and consequent upon the existence of their uncombined free forms. In order to ascertain putative sugar-dye interaction, crude LH carrying free subunits, pure LH, and non-glycosylated recombinant β subunit of LH were loaded separately on Cibacron Blue. Methyl mannoside was able to elute 33% of the bound protein in case of crude and pure LH, whereas there was little (3%) elution in case of recombinant LH β subunit. This study suggests a compositional heterogeneity in free and native subunits of LH from the buffalo pituitary. In addition, our findings reveal the pseudolectin-like behavior of Cibacron Blue.
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