JBC, Vol. 253, Issue 13, 4551-4554, Jul, 1978
Cellular retinoic acid-binding protein from rat testis. Purification and characterization
D. E. Ong and F. Chytil
Cellular retinoic acid-binding protein has been purified to homogeneity
from rat testes. The procedures utilized in the purification included acid
precipitation, gel filtration, and chromatography on DEAE-cellulose. The
binding protein was purified approximately 12,000-fold, based on total
soluble testicular protein. The protein is a single polypeptide chain with
a molecular weight of 14,600, determined by information from gel filtration
and sodium dodecyl sulfate-polyacrylamide electrophoresis. The protein
binds retinoic acid with high affinity; the apparent dissociation constant
was determined by fluorometric titration to be 4.2 X 10(-9) M.