Evidence map›Paper›PMID 18931376›Full record

ArticleNucleic acids research2008

MmeI: a minimal Type II restriction-modification system that only modifies one DNA strand for host protection.

Richard D Morgan, Tanya K Bhatia, Lindsay Lovasco, Theodore B Davis

Open access · goldAbstract read
In one paragraph

Article in Nucleic acids research, 2008. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 41 papers.

0numbers the graph read from it
0cells of the map it votes in
41citing papers in PubMed
1.8field-weighted citation impact, top 15% of its field
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

41 citing papers in PubMed, 59 citations in OpenAlex.

  1. Protein-Centric Mapping of RNA-DNA Interactions with RedChIP.Methods in molecular biology (Clifton, N.J.) · 2026
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  15. Mutator genomes decay, despite sustained fitness gains, in a long-term experiment with bacteria.Proceedings of the National Academy of Sciences of the United States of America · 2017
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4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

4 authors at 2 institutions in 1 country.

Richard D MorganNew England Biolabs Inc., Ipswich, MA and MCB Department, Brown University, Providence, RI, USA.
Tanya K Bhatia
Lindsay Lovasco
Theodore B Davis
New England Biolabs (United States) · USBrown University · US

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

MmeI is an unusual Type II restriction enzyme that is useful for generating long sequence tags. We have cloned the MmeI restriction-modification (R-M) system and found it to consist of a single protein having both endonuclease and DNA methyltransferase activities. The protein comprises an amino-terminal endonuclease domain, a central DNA methyltransferase domain and C-terminal DNA recognition domain. The endonuclease cuts the two DNA strands at one site simultaneously, with enzyme bound at two sites interacting to accomplish scission. Cleavage occurs more rapidly than methyl transfer on unmodified DNA. MmeI modifies only the adenine in the top strand, 5'-TCCRAC-3'. MmeI endonuclease activity is blocked by this top strand adenine methylation and is unaffected by methylation of the adenine in the complementary strand, 5'-GTYGGA-3'. There is no additional DNA modification associated with the MmeI R-M system, as is required for previously characterized Type IIG R-M systems. The MmeI R-M system thus uses modification on only one of the two DNA strands for host protection. The MmeI architecture represents a minimal approach to assembling a restriction-modification system wherein a single DNA recognition domain targets both the endonuclease and DNA methyltransferase activities.

Indexed as

AdenineBase SequenceCloning, MolecularDeoxyribonucleases, Type II Site-SpecificDNA CleavageDNA MethylationMethylophilus methylotrophusOpen Reading FramesSequence Analysis, DNASite-Specific DNA-Methyltransferase (Adenine-Specific)AdenineDeoxyribonucleases, Type II Site-Specificendodeoxyribonuclease MmeISite-Specific DNA-Methyltransferase (Adenine-Specific)

Identifiers

PMID18931376
PMCPMC2582602
OpenAlexW2112376090

What OpenQuestion holds

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LicenceCC BY-NC
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Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.