title: Structural properties of HIV integrase. Lens epithelium-derived growth factor oligomers.
abstract: Integrase (IN) is the catalytic component of the preintegration complex, a large nucleoprotein assembly critical for the integration of the retroviral genome into a host chromosome. Although partial crystal structures of human immunodeficiency virus IN alone and its complex with the integrase binding domain of the host factor PSIP1/lens epithelium-derived growth factor (LEDGF)/p75 are available, many questions remain regarding the properties and structures of LEDGF-bound IN oligomers. Using analytical ultracentrifugation, multiangle light scattering, and small angle x-ray scattering, we have established the oligomeric state, stoichiometry, and molecular shapes of IN.LEDGF complexes in solution. Analyses of intact IN tetramers bound to two different LEDGF truncations allow for placement of the integrase binding domain by difference analysis. Modeling of the small angle x-ray scattering envelopes using existing structural data suggests domain arrangements in the IN oligomers that support and extend existing biochemical data for IN.LEDGF complexes and lend new insights into the quaternary structure of LEDGF-bound IN tetramers. These IN oligomers may be involved in stages of the viral life cycle other than integration, including assembly, budding, and early replication.
authors.affiliation: Department of Biochemistry and Biophysics, University of Pennsylvania School of Medicine and Howard Hughes Medical Institute, Philadelphia, Pennsylvania 19105-6059, USA.
authors.forename: Kushol
authors.initials: K
authors.lastname: Gupta
authors.forename: Tracy
authors.initials: T
authors.lastname: Diamond
authors.forename: Young
authors.initials: Y
authors.lastname: Hwang
authors.forename: Frederic
authors.initials: F
authors.lastname: Bushman
authors.forename: Gregory D
authors.initials: GD
authors.lastname: Van Duyne
mesh_terms: D001665:Binding Sites / Q000235:genetics; D019427:HIV Integrase / Q000737:chemistry* / Q000235:genetics / Q000378:metabolism; D006801:Humans; D036341:Intercellular Signaling Peptides and Proteins / Q000737:chemistry* / Q000235:genetics / Q000378:metabolism; D008958:Models, Molecular; D009154:Mutation; D011485:Protein Binding; D055503:Protein Multimerization; D020836:Protein Structure, Quaternary; D017434:Protein Structure, Tertiary; D012542:Scattering, Radiation; D014965:X-Rays
chemical_list: D036341:Intercellular Signaling Peptides and Proteins; C119380:lens epithelium-derived growth factor; D019427:HIV Integrase
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