The DNA helicase activity of BLM is necessary for the correction of the genomic instability of bloom syndrome cells.

Abstract:

:Bloom syndrome (BS) is a rare autosomal recessive disorder characterized by growth deficiency, immunodeficiency, genomic instability, and the early development of cancers of many types. BLM, the protein encoded by BLM, the gene mutated in BS, is localized in nuclear foci and absent from BS cells. BLM encodes a DNA helicase, and proteins from three missense alleles lack displacement activity. BLM transfected into BS cells reduces the frequency of sister chromatid exchanges and restores BLM in the nucleus. Missense alleles fail to reduce the sister chromatid exchanges in transfected BS cells or restore the normal nuclear pattern. BLM complements a phenotype of a Saccharomyces cerevisiae sgs1 top3 strain, and the missense alleles do not. This work demonstrates the importance of the enzymatic activity of BLM for its function and nuclear localization pattern.

journal_name

Mol Biol Cell

authors

Neff NF,Ellis NA,Ye TZ,Noonan J,Huang K,Sanz M,Proytcheva M

doi

10.1091/mbc.10.3.665

keywords:

subject

Has Abstract

pub_date

1999-03-01 00:00:00

pages

665-76

issue

3

eissn

1059-1524

issn

1939-4586

journal_volume

10

pub_type

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