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Sac I (2KU/vl Cat.#1046), "A" buffer
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  Store at -20¡É. For Research Use Only!

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Sac I

Psp124B I, Sst I

5' ¡¦ G A G C T C ¡¦ 3'
3' ¡¦ C T C G A G ¡¦ 5'

#1046

2,000 units

#1046L

10,000 units

Supplied with : 10X Reaction Buffer 'A'


Concentration :            units/§¡


Lot # :                


Expiration date :                


Source : Streptomyces  achromogenes ATCC 12767


Compatible ends (AGCT¡¦3') : Psp124B I, Sst I


Isoschizomers

: Psp124B I, Sst I

- neoschizomer : Ecl136 II, EcolCR I


Methylation Sensitivity

: Not sensitive to dam, dcm and CpG methylation


Unit definition : One Unit is defined as the amount of Sac I required to completely digest 1 §¶ of ¥ë DNA in one hour at 37¡É in 50 §¡ assay mixture.


Typical Reaction Conditions : Add 5 §¡ of 10X Reaction Buffer 'A'[final conc.: 6 mM Tris-HCl (pH 7.5 @ 37¡É), 6 mM MgCl2, 6 mM NaCl, 1 mM DTT], 1~2 §¡ of DNA(0.5~1.0 §¶/§¡), 1 §¡ of Sac I and 42~43 §¡ of sterile water in 50 §¡ reaction mixture. Incubate at 37¡É.


Heat Inactivation : 65¡É for 20 min.


Activity in BeamsBio¢â Buffer System

Rxn Buffer

A

B

C

D

Activity(%)

75~100

10~50

10~50

<10


Activity in a complete PCR Mix : 75~100%
Conditions: [10 mM Tris-HCl(pH 8.3 @ 25¡É), 50 mM KCl, 1.5 mM MgCl2, 2 pmol of primers, 200 ¥ìM dNTP Mix, 2.5 U Taq DNA polymerase and 1 §¶ of DNA(template or substrate) in 50 §¡ of reaction volume] After 30 amplication cycles, add 5 units of Sac I. And then incubate at 37¡É for one hour. Relative activity is determined by gel electrophoresis.


Storage Conditions : : 10 mM Tris-HCl(pH 7.5 @ 25¡É), 100 mM KCl, 0.1 mM EDTA, 1 mM DTT, 0.15% Triton¢â X-100, 100 §¶/§¢ BSA, and 50% glycerol. Store at -20¡É.


No. of Cleavage Sites

¥ë

Ad2

pUC19

¥õX174

pBR322

M13mp18

SV40

2

16

1

0

0

1

0


Quality control

Overdigestion: The same band pattern as a digestion in one unit of Sac I for one hour was showing after incubation of 1 §¶ of ¥ë DNA with         units of Sac I for 16 hr in 50 §¡ of reaction mixture at 37¡É as determined by agarose gel electrophoresis.

Ligation-Recut: After a 10-fold digestion for one hour,        % of ¥ë DNA fragments were ligated with T4 DNA ligase at 16¡É and        % of the ligated fragments could be recut with Sac I.


Notes

- Sac I is inhibited by salt concentrations > 10 mM. Mini-prep DNA containing residual salt is resistant to cleavage.

The DNA may need to be ethanol precipitated and washed with 70% ethanol to reduce the salt.

Drop dialysis is the most effective way of reducing the salt.

- Sac I is sensitive to cytosine methylation at GAGmCTC but not GAGCTmC and insensitive to adenine methylation at GmAGCTC.

- Supercoiled plasmids may require up to 5-fold more Sac I(5~10 U/§¶ of pDNA) for complete digestion than linear DNA.

- High pH(> 8.0) will inhibit Sac I.


References

Kang, S.C., Yoon, H., Yoo, O.J. Korean Biochem. J. 19: 41-46 (1986)/ Zhuravleva, L.I., Oreshkin, E.N., Bezborodov, A.M. Prikl. Biokhim. Mikrobiol. 23: 208-215 (1987)


Beams Biotechnology Co., Ltd.


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