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Detection in BHK cells of a precursor form for lamin A.

Abstract：

:Lamins are structural proteins found in the fibrous lamina underlining the nuclear envelope. In vitro translation of polyadenylated RNA or polysomes followed by immunoprecipitation with a serum raised against BHK nuclear matrix proteins showed that lamin A (72 kD) is synthesized as a high molecular weight precursor (74 kD) (Laliberté et al., J Cell Biol 98 (1984) 980) [23]. We have thus investigated the presence in BHK cells of this putative precursor by in vivo labelling with [35S]methionine and immunoprecipitation of lamin proteins. Short labelling times, ranging from 5 to 60 min reveal the presence of the 74 kD protein. Pulse-chase experiments indicate that the half-life of the precursor is about 60 min. On two-dimensional gel, the 74 kD protein is resolved in a cluster of isovariants between pH 7.4 and 6.6, which are generally slightly more alkaline than their counterparts in lamin A. These results indicate that lamin A is synthesized as a precursor of 74 kD; the long half-life further suggests that pre-lamin A might accumulate in some sort of cellular pool before undergoing post-transcriptional modification(s) to give the mature form of lamin A.

journal_name

Exp Cell Res

journal_title

Experimental cell research

authors

Dagenais A,Bibor-Hardy V,Laliberté JF,Royal A,Simard R

doi

10.1016/0014-4827(85)90084-9

subject

Has Abstract

pub_date

1985-12-01 00:00:00

pages

269-76

issue

2

eissn

0014-4827

issn

1090-2422

journal_volume

161

pub_type

杂志文章

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