Thymine-containing dimers as well as spore photoproducts are found in ultraviolet-irradiated Bacillus subtilis spores that lack small acid-soluble proteins.
AUTOR(ES)
Setlow, B
RESUMO
Dormant spores of a Bacillus subtilis mutant that lacks two major small, acid-soluble spore proteins are very sensitive to UV irradiation, which in spores generates about half the amount of thymine-containing dimers formed by comparable irradiation of vegetative cells. Irradiation of mutant spores also produces spore photoproducts, but again only about one-half the amount formed in comparably irradiated wild-type spores. These findings suggest that the high UV sensitivity of the mutant spores is due to the production of pyrimidine dimers, which are not found in UV-irradiated wild-type spores, and that the high level of small, acid-soluble proteins found in wild-type spores is directly involved in spore UV resistance by facilitating a conformational change in spore DNA, preventing pyrimidine dimer formation.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=304219Documentos Relacionados
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- Genetically Controlled Removal of “Spore Photoproduct” from Deoxyribonucleic Acid of Ultraviolet-Irradiated Bacillus subtilis Spores
- Ultraviolet irradiation of DNA complexed with alpha/beta-type small, acid-soluble proteins from spores of Bacillus or Clostridium species makes spore photoproduct but not thymine dimers.
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