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NopA64, a novel nucleolar phosphoprotein from proliferating onion cells, sharing immunological determinants with mammalian nucleolin.

Abstract：

:Five major soluble nuclear proteins associated with cell proliferation were identified in Allium cepa L. root cells. One of them, of 64 kDa, was revealed by Western blotting with anti-mammalian nucleolin antibodies. A polyclonal antibody raised against this protein, which we have named NopA64, localised it in the nucleolus as well as in nuclear coiled bodies. Together with NopA64, the antibody also revealed a smaller form, called NopA61. Both proteins were present in the soluble ribonucleoprotein fraction and in the nuclear matrix of proliferating cells, but NopA61 was the only form revealed in differentiated cells. NopA64 contained epitopes also present in other plants, in mammalian nucleolin and in its yeast homologue, gar2. In mammals, the highest homology was with 50-kDa nucleolin fragments containing the RNA-binding motifs and the glycine-arginine-rich (GAR) domain. NopA64 was moderately phosphorylated in vitro by exogenous casein kinase II and cdc2 kinase, whereas NopA61 was highly phosphorylated by casein kinase II. Furthermore, NopA61 was the only band detected after dephosphorylation as well as after endoproteolysis of NopA64. This protein could be one of the various functional homologues of mammalian nucleolin in plant cells.

journal_name

Planta

journal_title

Planta

authors

de Cárcer G,Cerdido A,Medina FJ

doi

10.1007/s004250050093

subject

Has Abstract

pub_date

1997-01-01 00:00:00

pages

487-95

issue

4

eissn

0032-0935

issn

1432-2048

pii

10.1007/s004250050093

journal_volume

201

pub_type

杂志文章

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