2'-脱氧-β-L-尿苷是一种核苷类似物,可作为病毒酶的特异性底物。它对单纯疱疹病毒1型(HSV1)胸苷激酶(TK)没有立体特异性。2′-脱氧-β-L-尿苷通过与病毒DNA聚合酶的相互作用生成5′-三磷酸形式发挥抗病毒活性。[1][2]
中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
---|---|---|---|---|
—— | L-uridine | 58-96-8 | C9H12N2O6 | 244.204 |
2'-溴-2'-脱氧-D-尿苷 | 2'-bromo-2'-deoxyuridine | 4753-02-0 | C9H11BrN2O5 | 307.101 |
—— | 3',5'-dibenzoyl-2'-deoxy-β-L-uridine | 31615-99-3 | C23H20N2O7 | 436.421 |
中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
---|---|---|---|---|
—— | (1S,3S,5S)-1-(2,6-Dioxa-bicyclo[3.2.0]hept-3-yl)-1H-pyrimidine-2,4-dione | 176247-02-2 | C9H10N2O4 | 210.189 |
—— | 5-Iodo-2'-deoxy-L-uridine | 162239-35-2 | C9H11IN2O5 | 354.101 |
—— | β-2',3'-dideoxy-3'-fluoro-L-uridine | 207128-22-1 | C9H11FN2O4 | 230.196 |
—— | 4-Amino-1-(1S,3S,5S)-2,6-dioxa-bicyclo[3.2.0]hept-3-yl-1H-pyrimidin-2-one | 176247-04-4 | C9H11N3O3 | 209.205 |
In the present paper we demonstrate that the cytostatic and antiviral activity of pyrimidine nucleoside analogues is markedly decreased by a Mycoplasma hyorhinis infection and show that the phosphorolytic activity of the mycoplasmas is responsible for this. Since mycoplasmas are (i) an important cause of secondary infections in immunocompromised (e.g. HIV infected) patients and (ii) known to preferentially colonize tumour tissue in cancer patients, catabolic mycoplasma enzymes may compromise efficient chemotherapy of virus infections and cancer. In the genome of M. hyorhinis, a TP (thymidine phosphorylase) gene has been annotated. This gene was cloned, expressed in Escherichia coli and kinetically characterized. Whereas the mycoplasma TP efficiently catalyses the phosphorolysis of thymidine (Km=473 μM) and deoxyuridine (Km=578 μM), it prefers uridine (Km=92 μM) as a substrate. Our kinetic data and sequence analysis revealed that the annotated M. hyorhinis TP belongs to the NP (nucleoside phosphorylase)-II class PyNPs (pyrimidine NPs), and is distinct from the NP-II class TP and NP-I class UPs (uridine phosphorylases). M. hyorhinis PyNP also markedly differs from TP and UP in its substrate specificity towards therapeutic nucleoside analogues and susceptibility to clinically relevant drugs. Several kinetic properties of mycoplasma PyNP were explained by in silico analyses.