Sv. Gupta et al., RELATIONSHIP BETWEEN CONFORMATION AND ANTIVIRAL ACTIVITY .3. 3'-AZIDOTHYMIDINE (AZT) AND 3'-AZIDO-2',3'-DIDEOXY-5-HYDROXYMETHYLURIDINE, Nucleosides & nucleotides, 14(8), 1995, pp. 1675-1691
3'-Azido-2',3'-dideoxy-5-hydroxymethyluridine (AZHMddUrd) was synthesi
zed to improve the potency of 5-hydroxymethyl-2'-deoxyuridine (HMdUrd)
against human immunodeficiency virus (HIV). AZHMddUrd was a very poor
inhibitor of HIV replication (ED(50) > 200 mu M) and was also nontoxi
c up to 400 mu M (highest concentration tested) to HT4-6C (HeLa CD4) c
ells. AZT was phosphorylated by human cellular thymidine kinase. In co
ntrast, AZHMddUrd and HMdUrd were poor substrates for the kinase. The
relationship between molecular conformation and antiretroviral activit
y for 3'-azidothymidine (AZT), HMdUrd and AZHMddUrd is discussed.