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Human immunodeficiency virus (HIV) p24 was purified to homogeneity and subjected to NH2-terminal sequencing. The sequence determined perfectly corresponded to the amino acid sequence predicted from the nucleotide sequence of a middle portion of the HIV first open frame: the gag gene. Edman degradation of purified HIV p17 revealed instead a blocked NH2 terminus. Hybridomas secreting monoclonal antibodies to p24 and p17 were developed and used to immunologically characterize these two HIV gag gene products. They identified two gag precursor polyproteins in the cytoplasm of HIV-infected cells: Pr53gag, which corresponds to the primary translational product, and Pr39gag, which corresponds to an intermediate product of cleavage of Pr53gag. These monoclonal antibodies allowed us also to study posttranslational modification of HIV p24 and p17. p24 was found to be phosphorylated, which is a very unusual feature for a major retroviral core protein. p17 was found to be myristylated, as are all NH2-terminal gag proteins of the known human retroviruses.

Biochemical and immunological analysis of human immunodeficiency virus gag gene products p17 and p24