Nucleic Acids Research, 1993, Vol. 21, No. 15 3507-3511
© 1993
MOLECULAR BIOLOGY |
Characterization of a DNA binding domain in the C-terminus of HIV-1 integrase by deletion mutagenesis
Division of Viral Products, Center for Biologics Evaluation and Research FDA, Bethesda, MD 20892, USA
*To whom correspondence should be addressed
Received April 6, 1993. Revised June 14, 1993. Accepted June 14, 1993.
The integrase (IN) protein of human immunodeficiency virus type 1 (HIV-1) catalyzes site-specific cleavage of 2 bases from the viral long terminal repeat (LTR) sequence yet it binds DNA with little DNA sequence specificity. We have previously demonstrated that the C-terminal half of IN (amino acids 154288) possesses a DNA binding domain. In order to further characterize this region, a series of clones expressing truncated forms of IN as N-terminal fusion proteins in E.coli were constructed and analyzed by Southwestern blotting. Proteins containing amino acids 1 263, 1 248 and 170 288 retained the ability to bind DNA, whereas a protein containing amino acids 1 180 showed no detectable DNA binding. This defines a DNA binding domain contained within amino acids 180 248. This region contains an arrangement of 9 lysine and arginine residues each separated by 2 4 amino acids (KxxxKxxxKxxxxRxxxRxxRxxxxKxxxKxxxK), spanning amino acids 211 244, which is conserved in all HIV-1 isolates. A clone expressing full-length IN with a C-terminal fusion of 16 amino acids was able to bind DNA comparably to a cloned protein with a free C-terminus, and an IN-specific monoclonal antibody which recognizes an epitope contained within amino acids 264 279 was unable to block DNA binding, supporting the evidence that a region necessary for binding lies upstream of amino acid 264.
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