ribonuclease U2 EC#: 4.6.1.20; ChemWhat Code: 1382998
| Product Name | ribonuclease U2 |
| Example Structure |  |
| Synonyms | Pleospora RNase, Purine specific endoribonuclease, Purine-specific ribonuclease, Purine-specific RNase, Ribonuclease (purine), ribonuclease U2, ribonuclease U2A, ribonuclease U2B, Ribonuclease U3, RNase U2, RNase U2A, RNase U3, Trichoderma koningi RNase III, YoeB |
| EC Number | 4.6.1.20 |
| CAS Registry Number | |
| Comments | The enzyme secreted by the fungus?Ustilago sphaerogena?cleaves at the 3′-phosphate group of purines, and catalyses a two-stage endonucleolytic cleavage. The first reaction produces 5′-hydroxy-phosphooligonucletides and 3′-phosphooligonucleotides ending in Ap or Gp with 2′,3′-cyclic phosphodiester, which are released from the enzyme. The enzyme then hydrolyses these cyclic compounds in a second reaction that takes place only when all the susceptible 3′,5′-phosphodiester bonds have been cyclised. The second reaction is a reversal of the first reaction using the hydroxyl group of water instead of the 5′-hydroxyl group of ribose. The overall process is that of a phosphorus-oxygen lyase followed by hydrolysis to form the 3′-nucleotides. Formerly EC?3.1.27.4. |
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