Complete amino acid sequence of beta-tubulin from porcine brain.

Abstract
The primary structure of porcine brain .beta.-tubulin was determined by automated and manual Edman degradation of 6 sets of overlapping peptides. The protein consists of 445 amino acid residues and has a minimum of 6 positions that are heterogeneous, indicating at least 2 .beta.-tubulin in porcine brain. Comparison of the optimally aligned sequences of .alpha.-tubulin and .beta.-tubulin indicates that 41% of their primary structures are identical. A region rich in glycyl residues is similar both in sequence and predicted secondary structure to the phosphate binding loop of several nucleotide binding enzymes. .beta.-Tubulin contains a highly acidic COOH-terminal region that resembles the NH2-terminus of troponin T.