Involvement of recQ in the ultraviolet damage repair pathway in Deinococcus radiodurans.
Deinococcus radiodurans is a bacterium which can survive extremely DNA damage. To investigate the relationship between recQ and the ultraviolet radiation (UV) damage repair pathway, we created a four mutant strain by constructing recQ knockout mutants in uvrA1, uvrA2, and uvsE backgrounds. Using the rpoB/Rif(r) system, we measured the mutation frequencies and rates in wild type, recQ (MQ), uvsE uvrA1 uvrA2 (TNK006), and uvsE uvrA1 uvrA2 recQ (TQ). We then isolated Rif(r) mutants of these strains and sequenced the rpoB gene. The mutation frequency of TQ was 6.4, 10.1, and 2.43 times that of wild type, MQ, and TNK006, respectively, and resulted in rates of 4.7, 6.71, and 2.15 folds higher than that of wild type, MQ, and TNK006, respectively. All the strains demonstrated specific mutational hotspots. Furthermore, the TQ strain showed a transversion bias that was different from the other three strains. The results indicate that recQ is involved in the ultraviolet damage repair pathway via the interaction between recQ and uvrA1, uvrA2, and uvsE in D. radiodurans.
Hua
Xiaoting
X
Key Laboratory of Chinese Ministry of Agriculture for Nuclear-Agricultural Sciences, Institute of Nuclear-Agricultural Sciences, Zhejiang University, Kaixuan RD 268, Hangzhou, Zhejiang 310029, China.
Huang
Lifen
L
Tian
Bing
B
Hua
Yuejin
Y
D001426:Bacterial Proteins / Q000235:genetics; D004249:DNA Damage / Q000528:radiation effects*; D004260:DNA Repair / Q000528:radiation effects; D004269:DNA, Bacterial / Q000235:genetics; D034301:Deinococcus / Q000235:genetics* / Q000378:metabolism / Q000528:radiation effects*; D009154:Mutation; D011740:Pyrimidine Dimers; D053484:RecQ Helicases / Q000235:genetics*; D014466:Ultraviolet Rays
D001426:Bacterial Proteins; D004269:DNA, Bacterial; D011740:Pyrimidine Dimers; D053484:RecQ Helicases