Nuclease Grade Source Cleavage Specificity MW
RNase A Affinity pure
Bovine 3' of ss C's and U's 13.77.0-7.5NoneInactivated by 0.1% SDS (1)
RNase I MB*
E. coli
3' of ss NTPs of RNA 27.2  NoneResponsible for 98% of the EDTA-resistant RNase activity in E. coliextracts (2)
RNase T1 MB*
A. oryzae
3' of ss G's 11.17.5NoneSpecificity for G is 106X greater than A (3)
RNase V1 RNA
Cobra venom dsRNA 15.97.5Na+
(100 mM)
(0.3 mM)
Cleaves ssRNA at 10% the rate of dsRNA (1)
RNase H MB*
E. coli
RNA of RNA:DNA hybrids to give 5'-P oligonucleotides17.67.5-9.1Mg2+
(2–4 mM)
EDTA abolishes activity, but enzyme can still bind RNA:DNA hybrids; Not inhibited by vanadate (3)
DNase I RNase-free
(see also
Bovine dsDNA to yield 5'-P dinucleotides and 5'-P oligonucleotides 29.1 7.0-8.0Mg2+
(2–5 mM)
(0.1–1 mM)
Cleaves ssDNA 500X more slowly than dsDNA (3,4)
*MB = Molecular Biology Grade


  1. White, J.S. & White, D.C. (1997) Source Book of Enzymes, CRC Press, Boca Raton, FL.
  2. Zaniewski, R. et al. (1984) J Biol Chem 259: 11651-11653.
  3. Eun, H-M. (1996) Enzymology Primer for Recombinant DNA Technology, Academic Press, Inc., San Diego, CA.
  4. G. Latham, unpublished data.

Ordering Information

Sku Name Size Price Qty
AM1906 DNA-free™ DNA Removal Kit 50 reactions USD 102.00
AM2222 DNase I (RNase-free) 2,000 units USD 173.00
AM2224 DNase I (RNase-free) 5 x 2,000 units USD 415.00
AM2270 RNase A (affinity purified) 1 mg/mL 200 µg USD 71.25
AM2271 RNase A (affinity purified) 1 mg/mL 1 mg USD 227.00
AM2272 RNase A (RPA grade) 1 mg/mL 1 mg USD 71.25
AM2274 RNase A (1 μg/mL) 200 µL USD 122.00
AM2280 RNase T1 (cloned) 1,000 U/μL 100 µL USD 81.50
AM2283 RNase T1 (1 U/μL) 200 µL USD 122.00
AM2286 RNase Cocktail™ Enzyme Mix 1 mL USD 75.50
AM2288 RNase Cocktail™ Enzyme Mix 5 x 1 mL USD 227.00
AM2292 Ribonuclease H, from E. coli (cloned) 10 U/μL 200 units USD 81.50
AM2293 Ribonuclease H, from E. coli (cloned) 10 U/μL 1,000 units USD 227.00
AM2294 RNase I (cloned) 100 U/μL 10,000 units USD 117.00
AM2295 RNase I (cloned) 100 U/μL 25,000 units USD 240.00