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Entactin is a widely distributed basement membrane sulfated glycoprotein of approximately equal to 150 kDa. The entactin gene is expressed early in mouse embryogenesis. Two cDNA clones complementary to rat entactin mRNA were isolated by antibody screening of an oligo(dT)-primed cDNA library constructed in the lambda gt11 expression vector. One of the clones, lambda 1E, was subcloned into plasmid pBR322 and further characterized. The clone contained sequences complementary to an mRNA species 6 kilobases in length. This mRNA was translated in rabbit reticulocyte lysates to yield a polypeptide of 143 kDa that was precipitated with anti-entactin antiserum. The cDNA insert, 1328 base pairs long, was sequenced and found to contain an open reading frame of 729 base pairs that coded for 243 amino acids at the carboxyl terminus of entactin. Analysis of the peptide revealed no extended alpha-helical or beta-sheet secondary structures. Radiolabeled probes prepared by nicktranslation of p lambda 1E were used to monitor the steady-state levels of entactin mRNA in F9 embryonal carcinoma cells that were induced to differentiate by exposure to retinoic acid and dibutyryl cyclic AMP. The increase in steady-state levels of entactin mRNA lagged behind the increase in mRNA for the B2 chain of laminin, suggesting that laminin and entactin are independently rather than coordinately regulated.

Carboxyl-terminal sequence of entactin deduced from a cDNA clone.