Abstract
Haponin (HLDF-alike protein) was previously identified from the human promyelocytic leukemia HL-60 cell line. For the functional study of this protein, we obtained recombinant haponin with an N-terminal hexahistidine tag using a baculovirus expression system. Antibodies against 6xHis-haponin were produced, and the expression of endogenous haponin was demonstrated in mammalian cell lines of different origin. Using affinity chromatography and immunoprecipitation methods, we have shown that in CHO-K1 cells haponin interacts with glyceraldehyde 3-phosphate dehydrogenase (GAPDH), which is one of the vital glycolytic enzymes with a diverse set of noncanonical functions.
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