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Absence of transient elevated UV resistance during germination of 'Bacillus subtilis' spores lacking small, acid-soluble spore proteins alpha and beta

Technical Report ·
OSTI ID:6073261
;

Germinating spores of Bacillus subtilis mutants that lack small, acid-soluble spore proteins alpha and beta did not exhibit the transient elevated UV resistance seen during germination of wild-type spores. Dormant spores of various Bacillus species are much more resistant to UV irradiation than are the corresponding vegetative cells. This elevated spore UV resistance appears to have two causes. First, UV irradiation of spores does not produce the pyrimidine dimers formed in vegetative-cell DNA, but rather produces several other photoproducts, the most predominant of which is termed the spore photoproduct, a 5-thyminyl-5,6-dihydrothymine adduct (1, 10). Second, spores have at least two mechanisms that efficiently repair this spore photoproduct during spore germination, including one that monomerizes the adduct back to two thymines.

Research Organization:
Connecticut Univ. Health Center, Farmington (USA). Dept. of Biochemistry
OSTI ID:
6073261
Report Number(s):
AD-A-201373/8/XAB
Country of Publication:
United States
Language:
English

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Related Subjects

550700 -- Microbiology
560152* -- Radiation Effects on Animals-- Animals
59 BASIC BIOLOGICAL SCIENCES
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
AZINES
BACILLUS
BACILLUS SUBTILIS
BACTERIA
BIOLOGICAL EFFECTS
BIOLOGICAL RADIATION EFFECTS
BIOLOGICAL RECOVERY
BIOLOGICAL REPAIR
DNA
ELECTROMAGNETIC RADIATION
GERMINATION
HETEROCYCLIC COMPOUNDS
HYDROXY COMPOUNDS
IRRADIATION
MICROORGANISMS
MUTATIONS
NUCLEIC ACIDS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
PROTEINS
PYRIMIDINE DIMERS
PYRIMIDINES
RADIATION EFFECTS
RADIATIONS
RECOVERY
REPAIR
SPORES
THYMINE
TRANSIENTS
ULTRAVIOLET RADIATION
URACILS