The yeast protein encoded by PUB1 binds T-rich single stranded DNA
| Autor: | Graham J. Hughes, Susan M. Gasser, Moira M. Cockell, Séverine Frutiger |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 1994 |
| Předmět: |
DNA Replication
Saccharomyces cerevisiae Proteins Genes Fungal Molecular Sequence Data DNA Single-Stranded Saccharomyces cerevisiae Regulatory Sequences Nucleic Acid Poly(A)-Binding Proteins Fungal Proteins Affinity chromatography Poly(A)-binding protein Genetics Consensus sequence Binding site Peptide sequence Single-strand DNA-binding protein Fungal protein Base Composition biology Base Sequence Sequence Homology Amino Acid Binding protein RNA-Binding Proteins Molecular biology DNA-Binding Proteins Oligodeoxyribonucleotides biology.protein Sequence Alignment |
| Popis: | We have characterized binding activities in yeast which recognise the T-rich strand of the yeast ARS consensus element and have purified two of these to homogeneity. One (ACBP-60) is detectable in both nuclear and whole cell extracts, while the other (ACBP-67) is apparent only after fractionation of extracts by heparin-sepharose chromatography. The major binding activity detected in nuclear extracts was purified on a sequence-specific DNA affinity column as a single polypeptide with apparent mobility of 60kDa (ACBP-60). This protein co-fractionates with nuclei, is present at several thousand copies per cell and has a Kd for the T-rich single strand of the ARS consensus between 10(-9) and 10(-10) M. Competition studies with simple nucleic acid polymers show that ACBP-60 has marginally higher affinity for poly dT30 than for a 30 nt oligomer containing the T-rich strand of ARS 307, and approximately 10 fold higher affinity for poly rU. Internal sequence information of purified p60 reveals identity with the open reading frames of genes PUB1 and RNP1 which encode polyuridylate binding protein(s). The second binding activity, ACBP-67, also binds specifically to the T-rich single strand of the ARS consensus, but with considerably lower affinity than ACBP-60. Peptide sequence reveals that the 67kDa protein is identical to the major polyA binding protein in yeast, PAB1. |
| Databáze: | OpenAIRE |
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