Analysis and mapping of plastin phosphorylation.
DNA Cell Biol
; 17(12): 1041-6, 1998 Dec.
Article
em En
| MEDLINE
| ID: mdl-9881671
ABSTRACT
Plastins (fimbrins) are a family of three tissue-specific actin-binding proteins. Both L- and T-plastin have been shown to be involved in cytoskeletal reorganization in signal-transduction pathways. Phosphorylation of the leukocyte-specific L-plastin plays important roles in regulating L-plastin function and leukocyte activation. We created L-plastin mutants, changing each of the Ser-5 and Ser-7 residues to alanine. Expression of either mutant in WI38VA13 fibroblasts did not result in phosphorylation. The transfected wildtype L-plastin was phosphorylated in WI38VA13, but its two-dimensional gel pattern suggested that it was phosphorylated on one residue, whereas the endogenous L-plastin in leukocytes was likely phosphorylated on two residues. The nonleukocyte-specific T-plastin, which has an equivalent Ser-7 residue, was not phosphorylated in T-plastin-expressing fibroblasts or in transfected leukocytes. Expression of CK-IIalpha, the catalytic subunit of casein kinase II, resulted in changes of the protein expression profile in leukocytes but not the phosphorylation status of L- or T-plastin. Phorbol myristate acetate induced L-plastin phosphorylation in both leukocytes and fibroblasts, lending support to the view that protein kinase C is the likely candidate kinase for L-plastin phosphorylation.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Fosfoproteínas
Limite:
Humans
Idioma:
En
Revista:
DNA Cell Biol
Assunto da revista:
BIOLOGIA MOLECULAR
Ano de publicação:
1998
Tipo de documento:
Article
País de afiliação:
Estados Unidos