Conformationally Restricted Nucleosides. The Reaction of Adenosine Deaminase with Substrates Built on a Bicyclo[3.1.0]hexane Template
作者:Victor E. Marquez、Pamela Russ、Randolph Alonso、Maqbool A. Siddiqui、Kye-Jung Shin、Clifford George、Marc C. Nicklaus、Fang Dai、Harry Ford
DOI:10.1080/15257779908041487
日期:1999.4
Adenosine deaminase (ADA) can discriminate between two distinct (North and South), conformationally rigid substrate conformers. (N)-methanocarba-2'dA (4) is deaminated 100 times faster than the antipodal (S)-methanocarba-2'dA (5), whereas a non-rigid analogue, aristeromycin (6), is deaminated at an intermediate rate. These results are in agreement with crystallographic data from ADA-ribonucleoside complexes showing the furanose ring of the bound purine in a C3'-endo (North) conformation. The data presented here suggests that 4 and 5 are useful probes to ascertain conformational preferences by purine metabolizing enzymes.
Synthesis of Conformationally Restricted Carbocyclic Nucleosides: The Role of the O(4′)-Atom in the Key Hydration Step of Adenosine Deaminase
作者:Victor E. Marquez、Pamela Russ、Randolph Alonso、Maqbool A. Siddiqui、Susana Hernandez、Clifford George、Marc C. Nicklaus、Fang Dai、Harry Ford, Jr.