The Gam protein of bacteriophage Mu is an orthologue of eukaryotic Ku.

Abstract:

:Mu bacteriophage inserts its DNA into the genome of host bacteria and is used as a model for DNA transposition events in other systems. The eukaryotic Ku protein has key roles in DNA repair and in certain transposition events. Here we show that the Gam protein of phage Mu is conserved in bacteria, has sequence homology with both subunits of Ku, and has the potential to adopt a similar architecture to the core DNA-binding region of Ku. Through biochemical studies, we demonstrate that Gam and the related protein of Haemophilus influenzae display DNA binding characteristics remarkably similar to those of human Ku. In addition, we show that Gam can interfere with Ty1 retrotransposition in Saccharomyces cerevisiae. These data reveal structural and functional parallels between bacteriophage Gam and eukaryotic Ku and suggest that their functions have been evolutionarily conserved.

journal_name

EMBO Rep

journal_title

EMBO reports

authors

d'Adda di Fagagna F,Weller GR,Doherty AJ,Jackson SP

doi

10.1038/sj.embor.embor709

keywords:

subject

Has Abstract

pub_date

2003-01-01 00:00:00

pages

47-52

issue

1

eissn

1469-221X

issn

1469-3178

pii

embor709

journal_volume

4

pub_type

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