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The major nucleoside triphosphatase in pea (Pisum sativum L.) nuclei and in rat liver nuclei share common epitopes also present in nuclear lamins.
Tong, C G; Dauwalder, M; Clawson, G A; Hatem, C L; Roux, S J.
Afiliação
  • Tong CG; Department of Botany, University of Texas at Austin 78713.
Plant Physiol ; 101(3): 1005-11, 1993 Mar.
Article em En | MEDLINE | ID: mdl-7508630
ABSTRACT
The major nucleoside triphosphatase (NTPase) activities in mammalian and pea (Pisum sativum L.) nuclei are associated with enzymes that are very similar both biochemically and immunochemically. The major NTPase from rat liver nuclei appears to be a 46-kD enzyme that represents the N-terminal portion of lamins A and C, two lamina proteins that apparently arise from the same gene by alternate splicing. Monoclonal antibody (MAb) G2, raised to human lamin C, both immunoprecipitates the major (47 kD) NTPase in pea nuclei and recognizes it in western blot analyses. A polyclonal antibody preparation raised to the 47-kD pea NTPase (pc480) reacts with the same lamin bands that are recognized by MAb G2 in mammalian nuclei. The pc480 antibodies also bind to the same lamin-like bands in pea nuclear envelope-matrix preparations that are recognized by G2 and three other MAbs known to bind to mammalian lamins. In immunofluorescence assays, pc480 and anti-lamin antibodies stain both cytoplasmic and nuclear antigens in plant cells, with slightly enhanced staining along the periphery of the nuclei. These results indicate that the pea and rat liver NTPases are structurally similar and that, in pea nuclei as in rat liver nuclei, the major NTPase is probably derived from a lamin precursor by proteolysis.
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Texto completo: 1 Coleções: 01-internacional Temas: Geral Base de dados: MEDLINE Assunto principal: Plantas Medicinais / Proteínas Nucleares / Hidrolases Anidrido Ácido / Lamina Tipo A / Fabaceae / Fígado / Epitopos Limite: Animals / Humans Idioma: En Revista: Plant Physiol Ano de publicação: 1993 Tipo de documento: Article

Texto completo: 1 Coleções: 01-internacional Temas: Geral Base de dados: MEDLINE Assunto principal: Plantas Medicinais / Proteínas Nucleares / Hidrolases Anidrido Ácido / Lamina Tipo A / Fabaceae / Fígado / Epitopos Limite: Animals / Humans Idioma: En Revista: Plant Physiol Ano de publicação: 1993 Tipo de documento: Article