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Levels of synthesis of primate-specific nuclear proteins differ between growth-arrested and proliferating cells.

Abstract：

:A monoclonal antibody that reacts specifically with the proliferation-sensitive nuclear proteins, isoelectric focusing (IEF) 8Z30 and 8Z31 (molecular weight (MW), 76,000 charge variants, HeLa protein catalogue number) has been characterized. As determined by indirect immunofluorescence, the antibody stains the nucleolus and nucleoplasm of interphase-cultured cells of primate origin, but does not react with cells of other species. Proteins having similar MWs and isoelectric points as the human or monkey (primates) proteins were not observed in cultured cells of the following species: aves, bat, dog, dolphin, goat, hamster, mink, mouse, pisces, potoroo, rabbit and rat. Quantitative two-dimensional (2D) gel electrophoretic analysis of [35S]methionine-labeled proteins synthesized by normal (quiescent, proliferating) and SV40-transformed human MRC-5 fibroblasts revealed significant differences in the levels of synthesis of both IEF 8Z30 and 8Z31. In quiescent cells the main labelled product corresponded to IEF 8Z31 (ratio IEF 8Z31/8Z30, 2.3), while in the transformed cells the major product was IEF 8Z30 (ratio, 0.62). Normal proliferating fibroblasts exhibited similar levels of both proteins (ratio, 1.21). Combined levels of synthesis of both proteins were 1.50 and 1.20 times as high in the transformed cells as in the quiescent and proliferating cells, respectively. Similar results were observed in other pairs of normal and transformed human cells, such as WI38/WI38 SV40 and amnion/AMA. Modulation of the levels of synthesis of these proteins may play a role in cell proliferation.

journal_name

Exp Cell Res

journal_title

Experimental cell research

authors

Celis JE,Madsen P,Nielsen S,Petersen Ratz G,Lauridsen JB,Celis A

doi

10.1016/0014-4827(87)90011-5

subject

Has Abstract

pub_date

1987-02-01 00:00:00

pages

389-401

issue

2

eissn

0014-4827

issn

1090-2422

journal_volume

168

pub_type

杂志文章

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