title: Structural rearrangements on HIV-1 Tat (32-72) TAR complex formation.
abstract: Expression of the early genes of the human immunodeficiency virus type-I (HIV-1) genome is under the control of a trans-activator (Tat) protein. HIV-1 Tat action requires binding to TAR (trans-activation responsive element), an RNA sequence located at the 5'-end of all lentiviral mRNAs. We used various spectroscopic methods to investigate conformational changes on HIV-1 TAR binding to the HIV-1 (32-72) Tat peptide BP1. It comprises the RNA binding region and binds specifically to TAR. We conclude from our experiments that the regular A-form of the TAR RNA is slightly distorted towards the B-form when bound to BP1. Thus, the major groove is widened and the binding of BP1 facilitated. BP1 presumably adopts an extended conformation when binding to TAR and may fit well into the TAR major groove.
authors.affiliation: Lehrstuhl für Biopolymere, Universität Bayreuth, Germany.
authors.forename: A U
authors.initials: AU
authors.lastname: Metzger
authors.forename: T
authors.initials: T
authors.lastname: Schindler
authors.forename: D
authors.initials: D
authors.lastname: Willbold
authors.forename: M
authors.initials: M
authors.lastname: Kraft
authors.forename: C
authors.initials: C
authors.lastname: Steegborn
authors.forename: A
authors.initials: A
authors.lastname: Volkmann
authors.forename: R W
authors.initials: RW
authors.lastname: Frank
authors.forename: P
authors.initials: P
authors.lastname: Rosch
mesh_terms: D000595:Amino Acid Sequence; D002942:Circular Dichroism; D004268:DNA-Binding Proteins / Q000737:chemistry / Q000378:metabolism; D015696:Gene Products, tat / Q000737:chemistry* / Q000378:metabolism*; D015497:HIV-1 / Q000737:chemistry / Q000235:genetics*; D008958:Models, Molecular; D008969:Molecular Sequence Data; D009419:Nerve Tissue Proteins / Q000737:chemistry / Q000378:metabolism; D011487:Protein Conformation; D012333:RNA, Messenger / Q000737:chemistry* / Q000378:metabolism*; D012367:RNA, Viral / Q000737:chemistry / Q000378:metabolism; D016601:RNA-Binding Proteins; D017550:Spectroscopy, Fourier Transform Infrared; D014466:Ultraviolet Rays; D054322:tat Gene Products, Human Immunodeficiency Virus
chemical_list: D004268:DNA-Binding Proteins; D015696:Gene Products, tat; D009419:Nerve Tissue Proteins; D012333:RNA, Messenger; D012367:RNA, Viral; D016601:RNA-Binding Proteins; D054322:tat Gene Products, Human Immunodeficiency Virus