BAF-1 mobility is regulated by environmental stresses.

Abstract:

:Barrier to autointegration factor (BAF) is an essential component of the nuclear lamina that binds lamins, LEM-domain proteins, histones, and DNA. Under normal conditions, BAF protein is highly mobile when assayed by fluorescence recovery after photobleaching and fluorescence loss in photobleaching. We report that Caenorhabditis elegans BAF-1 mobility is regulated by caloric restriction, food deprivation, and heat shock. This was not a general response of chromatin-associated proteins, as food deprivation did not affect the mobility of heterochromatin protein HPL-1 or HPL-2. Heat shock also increased the level of BAF-1 Ser-4 phosphorylation. By using missense mutations that affect BAF-1 binding to different partners we find that, overall, the ability of BAF-1 mutants to be immobilized by heat shock in intestinal cells correlated with normal or increased affinity for emerin in vitro. These results show BAF-1 localization and mobility at the nuclear lamina are regulated by stress and unexpectedly reveal BAF-1 immobilization as a specific response to caloric restriction in C. elegans intestinal cells.

journal_name

Mol Biol Cell

authors

Bar DZ,Davidovich M,Lamm AT,Zer H,Wilson KL,Gruenbaum Y

doi

10.1091/mbc.E13-08-0477

subject

Has Abstract

pub_date

2014-04-01 00:00:00

pages

1127-36

issue

7

eissn

1059-1524

issn

1939-4586

pii

mbc.E13-08-0477

journal_volume

25

pub_type

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