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Species: Escherichia coli 
Group: K12 
Strain designation: MC1061(λ) 
Accession number: LMBP 1061 
Depositor: Prof. Dr E. Remaut1 2
1 Department for Molecular Biomedical Research, VIB, Ghent, Belgium
2 Department of Biomedical Molecular Biology, Ghent University, Ghent, Belgium 
Containment level: This strain has been assigned the containment level Class 1 following the European Directive 2009/41/EC on the contained use of genetically modified organisms, and its updates (see also the Belgian risk group classification). 
Medium: LB-Lennox 
Selection marker: / 
Temperature: 28°C (Note: 37°C is also possible but phage lambda remains more stably integrated when grown at 28°C) 
Genotype: F- Δ(araA-leu)7697 [araD139]B/r Δ(codB-lacI)3 galK16 galE15(GalS) e14- mcrA0 relA1 rpsL150 spoT1 mcrB1 hsdR2 λ+ 
Phenotype: StrR rK- mK+ 
Properties: Useful host for primary transformation. Transforms very well by the CaCl2 method (10exp7/μg). There is no Type I restriction; incoming DNA receives the E. coli K modification. Lysogenized with λ wild type. Recommended as maintenance host for plasmids containing the PL or PR promoter from phage λ. It is recommended to grow MC1061(λ), containing pPL plasmids, at 28°C. 
Further information: As this strain is deleted for the lacI repressor gene, it is not a suitable host for plasmids carrying the lac promoter or derivatives thereof, such as tac, trc, N25/O2 ... promoters. In the absence of repression, continuous transcription from the lac promoter is likely to result in plasmid instability.

Constructed by lysogenizing λ in MC1061 (Casadaban et al., 1980).

Contains no T7RNAP and the λ wt repressor efficiently represses the λ PL promoter. 
Original reference: Mertens et al., Gene 164 (1995), 9-15 [PMID: 7590329]
 
Related reference: Casadaban et al., J. Mol. Biol. 138 (1980), 179-207 [PMID: 6997493]
 
Restricted use: - BCCM MTA 
Refer in your Materials and Methods: Escherichia coli K12 MC1061(λ) (LMBP 1061) is available at BCCM/GeneCorner. It was deposited by Prof. Dr E. Remaut and was publi