CviJI

Source: Chlorella virusIL-3A

5’-Pu G C Py-3’
3’-Py C G Pu-5’

Note: Purified from a recombinant source (Patent No. US005472872A)

Reaction Temperature: 37°C

Prototype: CviJI

Inactivation Temperature (20 min): 50°C

Reaction Buffer:

1x CviJI Buffer: 20 mM glycylglycine-KOH (pH 8.5), 10 mM magnesium acetate, 50 mM potassium acetate, 0.1 mM dithiothreitol, 10% DMSO.

Unit Definition: One unit is the amount of enzyme required to completely digest 1 µg of pBR322 DNA in 1 hour in a total reaction volume of 25 µl.

Storage Conditions: Store at –20°C.

Description:

CviJI is the only available restriction endonuclease recognizing two-three base pair sequence (1,2,3), thus allowing for new research applications (4). This recombinant version of CviJI cleaves only PuGCPy sites (4). It does not exhibit star activity (CviJI*) (1,2), thus it is better suited for high resolution mapping of short DNA’s like amplified products or small plasmids. Other CviJI applications, like shotgun cloning, thermal cycle labeling (5) or epitope mapping can be performed either with this version or with CviJI*.

Quality Control:

Non-specific Endonuclease: Incubation of 1 unit of CviJI with 1 µg of pBR322 plasmid DNA at 37°C for 16 hrs (a 16-fold over-digestion) resulted in the same sharp characteristic banding pattern as the standard assay reaction, as determined by agarose gel electrophoresis.

3′-Exonuclease: 0.3, 0.6 and 1.2 units of CviJI and 0.13 µg (0.65 pmol of 3′-ends) of lambda/TaqI fragments (3′-labeled with T4 DNA Polymerase and [³H]dGTP and [³H]dCTP), incubated for 1 hr at 37°C resulted in 0.03 slope of %-end label released per unit of enzyme. Reaction volume 10 µl.

5′-Exonuclease/5′-Phosphatase: Incubation of 5, 10 and 20 units of CviJI with 0.05 µg (0.30 pmol of 5′-ends) of [5′-³³P] lambda/HaeIII fragments for 1 hr at 37°C resulted in 0.024 slope of %-end label released per unit of enzyme. Reaction volume 10 µl.

References:
1. Xia,Y., Burbank, D., Uher, L., Rabussay, D. and Van Etten, J. Nucleic Acids Res.15, 6075-6090.
2. Fitzgerald,M.C., Skowron, P., Van Etten, J.L., Smith, L.M. and Mead, D.A. (1992) Nucleic Acids Res. 20, 3753-3762.
3. Mead, D., Swaminathan, N., Van Etten J. and Skowron, P.M.: Recombinant CviJI restriction endonuclease. (1995) Unites States Patent no US005472872A.
4. Skowron, P.M, Swaminathan, N., McMaster, K., George, D., Van Etten, J. and Mead, D. Gene 157 (1995) 37-41.
5. Swaminathan, N., McMaster, K., Skowron, P. and Mead, D.A. Analytical Biochemistry 255 (1998) 133-141.