Tyrosinatable and non-tyrosinatable tubulin subpopulations in rat muscle in comparison with those in brain.
Biochim Biophys Acta
; 1163(1): 26-30, 1993 Apr 21.
Article
em En
| MEDLINE
| ID: mdl-8476927
ABSTRACT
Using immunobinding and enzymatic assays we determined in rat muscle extracts the proportion of tyrosinatable tubulin, that is, tubulin that participates in the tyrosination/detyrosination cycle. We found that in muscle, in contrast with nervous tissue, practically all tubulin molecules are tyrosinatable. In the case of rat brain the non-tyrosinatable tubulin pool accounts for about 50% of the tubulin. In addition, isolectrofocusing of 14C-tyrosinated tubulin from brain and muscle extracts revealed a different composition in tyrosinatable tubulin isotypes. One of the isotypes, which in muscle accounts for 86% of the 14C-tyrosinated tubulin species, was detyrosinated by the action of tubulin carboxypeptidase faster than the rest of the 14C-tyrosinated tubulin isotypes taken in whole. In the case of brain extract, that isotype accounts for only 16% of the labeled tubulin.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Tirosina
/
Tubulina (Proteína)
/
Músculos
Limite:
Animals
Idioma:
En
Ano de publicação:
1993
Tipo de documento:
Article