منابع مشابه
Induced Polynucleotide Kinase, Polynucleotide Ligase, and Deoxyribonucleic Acid Polymeraset
The mechanism of action of T4-induced polynu-cleotide kinase on short single-stranded deoxyoligonucleotideshas been investigated.It was found that the phosphorylationreaction catalyzed by T, polynucleotide kinase could be re-versed. Thus, a 5 ’-3*P-labeleddeoxyoligonucleotide and ADPon incubation with the enzyme formed [Y-~~PJATP.In addi-tion some radioac...
متن کاملDNA end processing by polynucleotide kinase/phosphatase.
S cission of one or both strands of the DNA duplex occurs as ionizing radiation and oxidative DNA damage mount a constant assault our genomes. Like a broken limb, or split piece of wood, DNA strand breaks are typically not clean. That is, they lack the DNA 3′-hydroxyl and 5′-phosphate moieties needed for DNA repair synthesis by DNA polymerases and DNA end joining by DNA ligases (Fig. 1A). For i...
متن کاملBacteriophage T4 polynucleotide kinase triggers degradation of mRNAs.
The bacteriophage T4-encoded RegB endoribonuclease is produced during the early stage of phage development and targets mostly (but not exclusively) the Shine-Dalgarno sequences of early genes. In this work, we show that the degradation of RegB-cleaved mRNAs depends on a functional T4 polynucleotide kinase/phosphatase (PNK). The 5'-OH produced by RegB cleavage is phosphorylated by the kinase act...
متن کاملStabilization of T4 polynucleotide kinase by macromolecular crowding.
T4 polynucleotide kinase rapidly loses activity during its reaction on duplex DNA termini. Addition of high concentrations of nonspecific polymers reverses or prevents this inactivation. In contrast, additions of related materials of lower molecular weight are relatively ineffective in stabilizing the kinase. Such a pattern suggests that the stabilizing effects of polymers on kinase activity ar...
متن کاملRecognition of DNA substrates by T4 bacteriophage polynucleotide kinase.
T4 phage polynucleotide kinase (PNK) displays 5'-hydroxyl kinase, 3'-phosphatase and 2',3'-cyclic phosphodiesterase activities. The enzyme phosphorylates the 5' hydroxyl termini of a wide variety of nucleic acid substrates, a behavior studied here through the determination of a series of crystal structures with single-stranded (ss)DNA oligonucleotide substrates of various lengths and sequences....
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ژورنال
عنوان ژورنال: Structure
سال: 2002
ISSN: 0969-2126
DOI: 10.1016/s0969-2126(02)00833-x