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  Restriction endonucleases

Sph I

SphI is a restriction enzyme purified from Streptomyces phaeochromogenes. 

Reagents supplied: 10x R2 and 10x EQ buffer 

Unit definition: One unit is the amount of enzyme required to digest 1 μg of Lambda DNA in 60 min at 37oin a total reaction volume of 50 μl. 

(SKUs: RE038S, RE038L, REc038S, REc038L)

60.00144.00
  • 10u/μl
  • 40-60u/μl
  • 500 U
  • 3×500 U

Product Details

SphI is a restriction enzyme purified from Streptomyces phaeochromogenes

Reagents supplied: 10x R2 and 10x EQ buffer 

Unit definition: One unit is the amount of enzyme required to digest 1 μg of Lambda DNA in 60 min at 37oC in a total reaction volume of 50 μl. 

Digest Guidelines

  • Standard reaction conditions: In order to overcome DNA source variability, a ~10 fold overdigest is suggested:
10U Sph I1μl
10x eQ buffer5μl
DNA substrate1μg
Sterile ultrapure waterUp to 50 μl
  • Speed Digest reaction: Incubate for 15 minutes at 37oC as in standard reaction in 1x R2 buffer (50 mM NaCl, 10 mM Tris-HCl (pH 7.9 @ 25oC), 10 mM MgCl2, 100 μg/ml BSA) or 1x eQ buffer (20 mM Tris-acetate (pH 7.9 @ 25oC), 10 mM Mg-acetate, 50 mM K-acetate, 100 μg/ml BSA).
  • Activity(%) in EnzyQuest buffers -Double digest tips
R1R2R3R4EQ
75-1001005050100

Reactions were performed as for unit definition reaction. The above data could be used as guideline for double digest reactions. Our enzymes are also active and compatible in buffer systems from other vendors.

Heat inactivation: 65oC for 20 minutes

Methylation Sensitivity:

  • dam methylation: Not sensitive
  • dcm methylation: Not sensitive
  • CpG methylation: Not sensitive

Unit calculation assay conditions:

  • 1x R2 buffer
  • Lambda DNA
  • Incubation at 37oC

Storage conditions:

  • 100 mM KCl
  • 10 mM Tris-HCl (pH 7.4)
  • 0.1 mM EDTA
  • 1 mM dithiothreitol
  • 400 μg/ml BSA
  • 50% glycerol
  • Store at -20oC

Non-specific nuclease activity: 50 units of Sph I do not produce any unspecific cleavage products after 16 hrs incubation with 1 μg of Lambda DNA at 37oC.

Re-ligation and recut: After 10-fold overdigestion with Sph I, greater than 98% of the DNA fragments can be ligated and recut with this enzyme.

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