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Volume 81, Issue 3

Subterminal viral DNA nucleotides as specific recognition signals for human immunodeficiency virus type 1 and visna virus integrases under magnesium-dependent conditions Free

Abstract

Many reports describe the characteristics of susceptible viral DNA substrates to various retroviral integrases during reactions in which manganese serves as the divalent cation cofactor for site-specific nicking. However, manganese is known to alter the specificity of some endonucleases and magnesium may be the divalent cation used during retroviral integration . To address these concerns, we identified conditions under which the integrases of human immunodeficiency virus type 1 and visna virus were optimally active with magnesium (the first time such activity was shown for visna virus integrase) and used these conditions to test the susceptibility of a series of oligodeoxynucleotide substrates. The data show that two base pairs immediately internal to the conserved CA dinucleotide near the termini of retroviral DNA are selectively recognized by the two integrases and that the final six base pairs of viral DNA contain sufficient sequence information for specific recognition and cleavage by each enzyme. The results validate the importance of the subterminal viral DNA positions even in the presence of magnesium and identify viral DNA positions that functionally interact with integrase. The data obtained under magnesium-dependent conditions, which were obtained with substrates containing single and multiple base-pair substitutions and two different retroviral integrases, are consistent with those previously obtained with manganese. Thus, the large body of manganese-dependent data identifying terminal viral DNA positions that are important in substrate recognition by various integrases likely reflects interactions that are biologically relevant.

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2000-03-01
2024-04-19
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Subterminal viral DNA nucleotides as specific recognition signals for human immunodeficiency virus type 1 and visna virus integrases under magnesium-dependent conditions
J. Gen. Virol. 81, 839 (2000); https://doi.org/10.1099/0022-1317-81-3-839
/content/journal/jgv/10.1099/0022-1317-81-3-839
/content/journal/jgv/10.1099/0022-1317-81-3-839
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