We cloned a bovine cDNA encoding the neural adhesion molecule F3 and analyzed its nucleotide sequence. The coding region consisted of 3054 bp encoding 1018 amino acid (aa) residues. The M(r) calculated from the deduced aa sequence was 113,383. Bovine F3 had 93, 94 and 77% aa identity with the mouse, human and chicken homologs, respectively. Bovine F3, similar to those of chicken and human, was devoid of two aa residues (Ile-Thr) in the sixth immunoglobulin type C2-like domain, as compared with the mouse homolog. Parts of bovine F3 protein were overproduced in Escherichia coli. The antibodies raised against the recombinant proteins in rabbits reacted specifically with F3. F3 protein was detected in cerebellum, cerebrum and spinal cord in Western blot analysis.
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