Merck, 11558170001, Bln I (Avr II)

General description
Bln I recognizes the sequence C↓CTAGG and generates fragments with 5′-cohesive termini.

Compatible ends
Bln I ends are compatible with ends generated by Nhe I, Spe I and Xba I.

Isoschizomers
Bln I is an isoschizomer of Avr II.
Note: The complete 13 site Avr II restriction map of the E.coli genome has been reported.

Methylation sensitivity
The enzyme is not known to be affected by methylation.
Biochem/physiol Actions
Recognition sites: CCTAGG
CCTAGG
Restriction site: C↓CTAGG
C↓CTAGG
Heat inactivation: No inactivation of Bln I after incubation at 65 °C for 15 minutes.
Number of cleavage sites on different DNAs
λ: 2
φX174: 0
Ad2: 2
M13mp7: 0
M13mp18:0
pBR322: 0
pBR328: 0
pUC18: 0
SV40: 2

Preparation Note
Do not store below −25°C.
Analysis Note
Absence of nonspecific endonuclease activities
1 μg λDNA is incubated for 16 hours in 50 μl SuRE/Cut Buffer H with an excess of Bln I. The number of enzyme units which do not change the enzyme-specific pattern is stated in the certificate of analysis.

Absence of exonuclease activity
Approximately 5 μg [3H] labeled calf thymus DNA are incubated with 3 μl Bln I for 4 hours at +37°C in a total volume of 100 μl 50 mM Tris-HCl, 10 mM MgCl2, 1 mM Dithioerythritol, pH approximately 7.5. Under these conditions, no release of radioactivity is detectable, as stated in the certificate of analysis.

Typical ligation and recutting assay
Bln I fragments obtained by complete digestion of 1 μg λ × EcoR I DNA ligated for 16 hours at +4°C with 1 U T4 DNA Ligase in 10 μl buffer that contains 66 mM Tris-HCl, 5 mM MgCl2, 5 mM Dithiothreitol, 1 mM ATP, pH 7.5 (at +20°C). The percentages of product that can be ligated and subsequently recut with Bln I and EcoR I (yielding the typical pattern of λ × EcoR I × Bln I fragments) are stated under "Lig" and "Rec" in the certificate of analysis.
PFGE tested
Bln I has been tested in Pulsed-Field Gel Electrophoresis (on bacterial chromosomes). For cleavage of genomic DNA (E.coli C 600) embedded in agarose for PFGE analysis, we recommend using 10 U of enzyme/μg DNA and 4 hour incubation.
SuRE/Cut Buffer System
The buffer in bold is recommended for optimal activity
A: 25-50%
B: 50-75%
H: 100%
L: 0-10%
M: 25-50%

Activity in PCR buffer: Not tested
Other Notes
For life science research only. Not for use in diagnostic procedures.
One unit is the enzyme activity that completely cleaves 1 μg λ x EcoR I DNA fragments in one hour at +37 °C in a total volume of 25 μl (1x) SuRE/Cut Buffer H.