Complete Amino Acid Sequence of Alpha-tubulin from Porcine Brain

Overview

Journal Proc Natl Acad Sci U S A

Specialty Science

Date 1981 May 1

PMID 7019911

Citations 77

Authors

H Ponstingl

E Krauhs

M Little

T Kempf

Affiliations

Soon will be listed here.

Abstract

The amino acid sequence of alpha-tubulin from porcine brain was determined by automated and manual Edman degradation of eight sets of overlapping peptides. It comprises 450 residues plus a COOH-terminal tyrosine that is present only in 15% of the material. A region of 40 residues at the COOH-terminus is highly acidic, mainly due to 16 glutamyl residues. This high concentration of negative charge suggests a region for binding cations. At least six positions, most of them around position 270, are occupied by two amino acid residues each. Several of these exchange sites were assigned to specific peptides by analysis of the purified corresponding fragments. These data indicate four alpha-tubulins in porcine brain. Although alpha-tubulin on the whole is unrelated to other proteins, there are regions that can be correlated to sequences of the myosin head, to actin, to tropomyosin, and to troponins C and T.

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