Bls I

5,500.00 22,000.00 

  • CNY: 67.50 ¥ - 269.99 ¥

MD DNA endonuclease Bls I.
The enzyme cleaves C5-methylated DNA and doesn’t cut unmodified DNA.

  • Концентрация: 5000 е.а./мл
  • Recognition site: Последовательность ДНК, содержащая не менее двух 5mC:RYN↑RYYR↓NYR
  • Источник: Bacillus simplex 23
  • Оптимальный буфер: SE-буфер W
  • Оптимальная температура: 30
  • Температура инактивации, 20 мин при: 65
SKU: E533 Category:


Recognition site:

DNA sequence with at least two 5mC:

Source: Bacillus simplex 23

Substrate specificity:

Unit definition: One unit is defined as the amount of enzyme
required to hydrolyze at least one of three canonical sites
in 1 μg of linearized plasmid pFsp4HI3 in 1 hour at 30°C in a total reaction volume of 50 μl. As a result a linearized plasmid pFsp4HI3 disappears (see run 4 in the figure).

BlsI activity assay on DNA pFsp4HI3/DriI

1 and 7 – 1 Kb SE DNA-markers.
2 – Control DNA pFsp4HI3/DriI,
3 – 0.5 μl Bls I (1/5)
4 – 1 μl Bls I (1/5)
5 – 2 μl Bls I (1/5)
6 – 1 μl of undiluted BlsI

Products were separated in 1,4% agarose gel in Buffer TAE.

BlsI activity assay on DNA pFsp4HI3/DriI

Assayed on: DNA pFsp4HI3/DriI is a linearized plasmid pFsp4HI3, which carries a gene of DNA-methyltransferase M.Fsp4HI and includes three canonical sites:
5`-G(5mC)NG(5mC)-3`/3`-CGN(5mC)G-5` [2].
Optimal SE-buffer: SE-buffer W
Enzyme activity (%):

10 10 50 100 75 50

Storage conditions: 10 mM Tris-HCl (pH 7.5); 200 mM NaCl; 0.1 mM EDTA; 7 mM 2-mercaptoethanol; 200 μg /ml BSA; 50% glycerol; Store at -20°C.

Ligation: –

Non-specific hydrolisis: No detectable degradation of 1μg of Lambda DNA was observed after incubation with 5 units of enzyme for 16 hours at 30°C in a total reaction volume of 50 μl. Reagents Supplied with Enzyme 10 X SE-buffer W

Methylation sensitivity: The enzyme cleaves C5-methylated DNA and doesn’t cut unmodified DNA [1].



1. Chernukhin V.A., Tomilova J.E., Chmuzh E.V., Sokolova O.O., Dedkov V.S., Degtyarev S.Kh. Bacterial strain Bacillus simplex – producer of BlsI site specific endonuclease. // Russian Federation patent RU 2322494 C1 (2006).
2. Chmuzh E.V., Kashirina Yu.G., Tomilova Yu.E., Chernukhin V.A., Okhapkina S.S., Gonchar D. A., Dedkov V.S., Abdurashitov M. A., Degtyarev S. Kh. Gene cloning, comparative analysis of the protein structures from Fsp4HI restriction-modification system and biochemical characterization of the recombinant DNA methyltransferase M.Fsp4HI. // Molecular Biology, V.41, No 1, p. 43-50 (2007)

Degtyarev S.Kh., Prihod’ko G.G., Rechkunova N.I. Substrate specificity determination of restriction endonuclease SfeI.// Bioorg. chem (Moscow), Vol.14, No 6, 848-849 (1988). (In Russian)
Degtyarev S.Kh., Repin V.E., Rechkunova N.I. Proteus vulgaris – a strain producer of restriction endonuclease PvuII.// Soviet Union patent SU 1632974 (1991). (In Russian)
Kolykhalov A.A., Repin V.E., Fish A.M., Rechkunova N.I., Degtyarev S.Kh. Substrate specificity determination of restriction endonuclease Vha464I.// Sibirian Biological Journal, No 1, 60-61 (1991). (In Russian)
Degtyarev S. Kh., Kolyhalov A.A., Rechkunova N.I., Abdurashitov M.A. Acs I, a new restriction endonuclease from Arthrobacter citreus 310 recognizing 5'-Pu^AATTPy-3'. // Nucleic Acids Research, Vol. 20, No.14 (1992)

Available Options

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E533S100 u5,500.00 
E534L500 u22,000.00