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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Hidema, J. Kumagai, T. Sutherland, B. M. |
| Description | Country affiliation: Japan Author Affiliation: Hidema J ( Institute of Genetic Ecology, Tohoku University, Sendai 980-8577, Japan.) |
| Abstract | Norin 1, a progenitor of many economically important Japanese rice strains, is highly sensitive to the damaging effects of UVB radiation (wavelengths 290 to 320 nm). Norin 1 seedlings are deficient in photorepair of cyclobutane pyrimidine dimers. However, the molecular origin of this deficiency was not known and, because rice photolyase genes have not been cloned and sequenced, could not be determined by examining photolyase structural genes or upstream regulatory elements for mutations. We therefore used a photoflash approach, which showed that the deficiency in photorepair in vivo resulted from a functionally altered photolyase. These results were confirmed by studies with extracts, which showed that the Norin 1 photolyase-dimer complex was highly thermolabile relative to the wild-type Sasanishiki photolyase. This deficiency results from a structure/function alteration of photolyase rather than of nonspecific repair, photolytic, or regulatory elements. Thus, the molecular origin of this plant DNA repair deficiency, resulting from a spontaneously occurring mutation to UV radiation sensitivity, is defective photolyase. |
| File Format | HTM / HTML |
| ISSN | 10404651 |
| e-ISSN | 1531298X |
| Journal | THE PLANT CELL ONLINE |
| Issue Number | 9 |
| Volume Number | 12 |
| Language | English |
| Publisher | American Society of Plant Biologists |
| Publisher Date | 2000-09-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Discipline Botany Deoxyribodipyrimidine Photo-lyase Metabolism Oryza Sativa Radiation Effects Ultraviolet Rays Dna Repair Dna, Plant Chemistry Enzymology Genetics Plants Pyrimidine Dimers Temperature Time Factors Research Support, Non-u.s. Gov't Research Support, U.s. Gov't, Non-p.h.s. |
| Content Type | Text |
| Resource Type | Article |
| Subject | Cell Biology Plant Science |
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