home *** CD-ROM | disk | FTP | other *** search
- Document 0233
- DOCN M9620233
- TI In vitro integration of human immunodeficiency virus type 1 cDNA into
- targets containing protein-induced bends.
- DT 9602
- AU Bor YC; Bushman FD; Orgel LE; Salk Institute for Biological Studies, San
- Diego, CA 92186-8500,; USA.
- SO Proc Natl Acad Sci U S A. 1995 Oct 24;92(22):10334-8. Unique Identifier
- : AIDSLINE MED/96036079
- AB Integration of human immunodeficiency virus type 1 cDNA into a target
- DNA can be strongly influenced by the conformation of the target. For
- example, integration in vitro is sometimes favored in target DNAs
- containing sequence-directed bends or DNA distortions caused by bound
- proteins. We have analyzed the effect of DNA bending by studying
- integration into two well-characterized protein-DNA complexes:
- Escherichia coli integration host factor (IHF) protein bound to a phage
- IHF site, and the DNA binding domain of human lymphoid enhancer factor
- (LEF) bound to a LEF site. Both of these proteins have previously been
- reported to bend DNA by approximately 140 degrees. Binding of IHF
- greatly increases the efficiency of in vitro integration at hotspots
- within the IHF site. We analyzed a series of mutants in which the IHF
- site was modified at the most prominent hotspot. We found that each
- variant still displayed enhanced integration upon IHF binding. Evidently
- the local sequence is not critical for formation of an IHF hotspot. LEF
- binding did not create preferred sites for integration. The different
- effects of IHF and LEF binding can be rationalized in terms of the
- different proposed conformations of the two protein-DNA complexes.
- DE Bacterial Proteins/CHEMISTRY/*METABOLISM Base Sequence Comparative
- Study DNA Nucleotidyltransferases/BIOSYNTHESIS/*METABOLISM DNA Primers
- DNA-Binding Proteins/METABOLISM DNA,
- Complementary/CHEMISTRY/*METABOLISM DNA, Viral/CHEMISTRY/*METABOLISM
- Human HIV-1/*GENETICS/METABOLISM Models, Structural Molecular
- Sequence Data Nucleic Acid Conformation Polymerase Chain Reaction
- Protein Conformation Recombinant
- Proteins/BIOSYNTHESIS/CHEMISTRY/METABOLISM Support, U.S. Gov't, P.H.S.
- *Virus Integration JOURNAL ARTICLE
-
- SOURCE: National Library of Medicine. NOTICE: This material may be
- protected by Copyright Law (Title 17, U.S.Code).
-
-