Emp is a component of the nuclear matrix of mammalian cells and undergoes dynamic rearrangements during cell division.

Abstract:

:Emp, originally detected in erythroblastic islands, is expressed in numerous cell types and tissues suggesting a functionality not limited to hematopoiesis. To study the function of Emp in non-hematopoietic cells, an epitope-tagged recombinant human Emp was expressed in HEK cells. Preliminary studies revealed that Emp partitioned into both the nuclear and Triton X-100-insoluble cytoskeletal fractions in approximately a 4:1 ratio. In this study, we report investigations of Emp in the nucleus. Sequential extractions of interphase nuclei showed that recombinant Emp was present predominantly in the nuclear matrix. Immunofluorescence microscopy showed that Emp was present in typical nuclear speckles enriched with the spliceosome assembly factor SC35 and partially co-localized with actin staining. Coimmunoprecipitation and GST-pull-down assays confirmed the apparent close association of Emp with nuclear actin. During mitosis, Emp was detected at the mitotic spindle/spindle poles, as well as in the contractile ring during cytokinesis. These results suggest that Emp undergoes dynamic rearrangements within the nuclear architecture that are correlated with cell division.

authors

Bala S,Kumar A,Soni S,Sinha S,Hanspal M

doi

10.1016/j.bbrc.2006.02.060

subject

Has Abstract

pub_date

2006-04-21 00:00:00

pages

1040-8

issue

4

eissn

0006-291X

issn

1090-2104

pii

S0006-291X(06)00342-1

journal_volume

342

pub_type

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