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Originally published as Genetics Published Articles Ahead of Print on May 15, 2006.
Genetics, Vol. 173, 2399-2402, August 2006, Copyright © 2006
doi:10.1534/genetics.106.060426
Exonuclease Requirements for Recombination of 
-Phage in recD Mutants of Escherichia coli
Damir Ðermi
1,
Davor Zahradka and
Mirjana Petranovi
Division of Molecular Biology, Ru
er Bo
kovi Institute, 10002 Zagreb, Croatia
1 Corresponding author: Division of Molecular Biology, Ruer Bokovi Institute, Bijeni
ka 54, P.O. Box 180, 10002 Zagreb, Croatia.
E-mail: dermic{at}irb.hr
Recombination of 
red gam phage in recD mutants is unaffected by inactivation of RecJ exonuclease. Since nucleases play redundant roles in E. coli, we inactivated several exonucleases in a recD mutant and discovered that 5'–3' exonuclease activity of RecJ and exonuclease VII is essential for -recombination, whereas exonucleases of 3'–5' polarity are dispensable. The implications of the presented data on current models for recombination initiation in E. coli are discussed.