Dna Mutational Analysis
Mostrando 13-24 de 679 artigos, teses e dissertações.
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13. Mutational spectrum analysis of RNase H(35) deficient Saccharomyces cerevisiae using fluorescence-based directed termination PCR
Mutational spectrum analysis has become an informative genetic tool to understand those protein functions involved in mutation avoidance pathways since specific types of mutations are often associated with particular protein defects involved in DNA replication and repair. In this study, we describe a novel, fluorescence-based procedure for direct determinati
Oxford University Press.
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14. Structure-Based Mutational Analysis of the C-Terminal DNA-Binding Domain of Human Immunodeficiency Virus Type 1 Integrase: Critical Residues for Protein Oligomerization and DNA Binding
The C-terminal domain of human immunodeficiency virus type 1 (HIV-1) integrase (IN) is a dimer that binds to DNA in a nonspecific manner. The structure of the minimal region required for DNA binding (IN220–270) has been solved by nuclear magnetic resonance spectroscopy. The overall fold of the C-terminal domain of HIV-1 IN is similar to those of Src homolo
American Society for Microbiology.
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15. Mutational Analysis of AREA, a Transcriptional Activator Mediating Nitrogen Metabolite Repression in Aspergillus nidulans and a Member of the “Streetwise” GATA Family of Transcription Factors
Summary: The transcriptional activator AREA is a member of the GATA family of transcription factors and mediates nitrogen metabolite repression in the fungus Aspergillus nidulans. The nutritional versatility of A. nidulans and its amenability to classical and reverse genetic manipulations make the AREA DNA binding domain (DBD) a useful model for analyzing GA
American Society for Microbiology.
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16. Mutational analysis of the lambda int gene: DNA sequence of dominant mutations.
We have combined techniques of genetic and physical mapping with rapid DNA sequence analysis to identify the nucleotide change in lambda int mutations. These mutations define two dominant phenotypic classes: (i) recombination that is partially independent of accessory factors, and (ii) inhibition of wild-type Int by missense or nonsense proteins, i.e., negat
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17. DNA Sequence Analysis of the PorB Protein of Nonserotypeable Serogroup C ET-15 Meningococci Suggests a Potential Mutational Hot Spot on Their Serotype Antigens
The nucleotide sequences of the PorB proteins from 28 nonserotypeable serogroup C ET-15 meningococci recovered from invasive meningococcal disease cases were determined. PCR amplification of the porB genes responsible for encoding the serotype antigen was used for DNA sequence determination and identification of the nature of the serotype antigen. DNA sequen
American Society for Microbiology.
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18. Chlorella virus DNA ligase: nick recognition and mutational analysis.
Chlorella virus PBCV-1 DNA ligase seals nicked DNA substrates consisting of a 5'-phosphate-terminated strand and a 3'-hydroxyl-terminated strand annealed to a bridging DNA template strand. The enzyme discriminates at the DNA binding step between substrates containing a 5'-phosphate versus a 5'-hydroxyl at the nick. Mutational analysis of the active site moti
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19. Characterization of the DNA-Binding Domain of the Avian Y-Box Protein, chkYB-2, and Mutational Analysis of Its Single-Strand Binding Motif in the Rous Sarcoma Virus Enhancer
chkYB-2 is a sequence-specific, single-stranded DNA binding chicken Y-box protein that promotes Rous sarcoma virus long terminal repeat (RSV LTR)-driven transcription in avian fibroblasts. The DNA-binding domain of chkYB-2 has been mapped by characterizing the DNA binding properties of purified recombinant chkYB-2 mutant polypeptides. The data indicate that
American Society for Microbiology.
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20. Mutational spectrum at GATA1 provides insights into mutagenesis and leukemogenesis in Down syndrome
Down syndrome (DS) children have a unique genetic susceptibility to develop leukemia, in particular, acute megakaryocytic leukemia (AMkL) associated with somatic GATA1 mutations. The study of this genetic susceptibility with the use of DS as a model of leukemogenesis has broad applicability to the understanding of leukemia in children overall. On the basis o
American Society of Hematology.
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21. Specificity of ionizing radiation-induced mutagenesis in the lac region of single-stranded phage M13 mp10 DNA.
M13 mp10 single-stranded phage DNA was irradiated with 60 Co gamma-rays, and transfected into Escherichia coli. One hundred and sixteen mutant clones having lesions in the lac insert were selected, and mutational sites were examined by DNA sequence analysis. Fourteen out of the 15 nucleotide changes thus detected were base substitutions, and the rest was a b
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22. Mutational analysis of vaccinia virus topoisomerase identifies residues involved in DNA binding.
Vaccinia DNA topoisomerase catalyzes the cleavage and re-joining of DNA strands through a DNA-(3'-phosphotyrosyl)-enzyme intermediate formed at a specific target sequence, 5'-(C/T)CCTT downward arrow. The 314 aa protein consists of three protease-resistant structural domains demarcated by protease-sensitive interdomain segments referred to as the bridge and
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23. Databases and software for the analysis of mutations in the human p53 gene, the human hprt gene and the lacZ gene in transgenic rodents.
We have created databases and software applications for the analysis of DNA mutations in the human p53 gene, the human hprt gene and the rodent transgenic lacZ locus. The databases themselves are stand-alone dBase files and the software for analysis of the databases runs on IBM- compatible computers. The software created for these databases permits filtering
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24. In search of a mutational hotspot
In vitro selection was used to define sequence contexts that significantly enhanced the mutagenic potential of 7,8-dihydro-8-oxoguanine (8-oxoG). Contexts that simultaneously reduced the efficiency of 8-oxoG cleavage by formamidopyrimidine DNA N-glycosylase and increased the efficiency of misincorporating A opposite the lesion by DNA polymerase were isolated
The National Academy of Sciences.