Sequence specificity of the P1 modification methylase (M· Eco P1) and the DNA methylase (M· Eco dam) controlled by the Escherichia coli dam gene

Labeled oligonucleotides have been fractionated from pancreatic DNase digests of DNA that had been methylated in vitro with the P1 modification enzyme (M· Eco P1) or with the DNA-adenine methylase (M· Eco dam) controlled by the Escherichia coli dam gene. The sequences of methylated oligonucleotides...

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Veröffentlicht in:Journal of molecular biology 1978-12, Vol.126 (3), p.367-380
Hauptverfasser: Hattman, Stanley, Brooks, Joan E., Masurekar, Malthi
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container_title Journal of molecular biology
container_volume 126
creator Hattman, Stanley
Brooks, Joan E.
Masurekar, Malthi
description Labeled oligonucleotides have been fractionated from pancreatic DNase digests of DNA that had been methylated in vitro with the P1 modification enzyme (M· Eco P1) or with the DNA-adenine methylase (M· Eco dam) controlled by the Escherichia coli dam gene. The sequences of methylated oligonucleotides were established for M· Eco dam modification of calf thymus DNA. The results show that M· Eco dam inethylates adenine residues contained in the twofold symmetrical sequence, 5′ … G-A-T-C … 3′. The sequence for the site methylated by M· Eco P1 has also been deduced; we propose that M· Eco P1 modification produces the following methylated pentameric sequence: 5′ … A-G-A ∗-C-Py … 3′ (where A ∗ = N 6 methyladenine and Py is C or T).
doi_str_mv 10.1016/0022-2836(78)90046-3
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language eng
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source MEDLINE; Elsevier ScienceDirect Journals
subjects Base Sequence
Deoxyribonucleotides - analysis
DNA
DNA (Cytosine-5-)-Methyltransferases
Escherichia coli - genetics
Methyltransferases
Nucleic Acid Denaturation
Oligonucleotides - analysis
title Sequence specificity of the P1 modification methylase (M· Eco P1) and the DNA methylase (M· Eco dam) controlled by the Escherichia coli dam gene
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