Linked Life Data

11178904

Source:http://linkedlifedata.com/resource/pubmed/id/11178904

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
3
pubmed:dateCreated
2001-2-22
pubmed:abstractText
Reverse transcription of HIV-1 viral RNA uses human tRNA(Lys)3 as a primer. Recombinant tRNA(Lys)3 was previously overexpressed in Escherichia coli, 15N-labelled and purified for NMR studies. It was shown to be functional for priming of HIV-1 reverse transcription. Using heteronuclear 2D and 3D NMR, we have been able to assign almost all the imino groups in the helical regions and involved in the tertiary base interactions of tRNA(Lys)3. This crucial step enabled us to address the question of the annealing mechanism of tRNA(Lys)3 by the nucleocapsid protein (NC) using heteronuclear NMR. Moreover, structural aspects of the tRNA(Lys)3/(12-53)NCp7 interaction have been characterised. The (12-53)NCp7 protein binds preferentially to the inside of the L-shape of the tRNA(Lys)3, on the acceptor and D stems, and at the level of the tertiary interactions between the D and T-psi-C loops. (12-53)NCp7 binding does not induce the melting of any single base-pair or unwinding of the tRNA(Lys)3 helical domains. Moreover, NMR provides a unique means to investigate the base-pairs that are destabilised by (12-53)NCp7 binding. Indeed, the measurements of the longitudinal relaxation time T1 and of the exchange time of the imino protons revealed two major regions sensitive to catalysis by the protein, namely the G6-U67 and T54(A58) pairs. It is interesting that for the biological role of the NC protein, these pairs could be the starting points of the tRNA melting required for the hybridisation to the viral RNA.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Feb
pubmed:issn
0022-2836
pubmed:author
pubmed:issnType
Print
pubmed:day
23
pubmed:volume
306
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
443-54
pubmed:dateRevised
2007-11-15
pubmed:meshHeading
pubmed-meshheading:11178904-Anticodon, pubmed-meshheading:11178904-Base Pairing, pubmed-meshheading:11178904-Base Sequence, pubmed-meshheading:11178904-Capsid, pubmed-meshheading:11178904-Capsid Proteins, pubmed-meshheading:11178904-Gene Products, gag, pubmed-meshheading:11178904-HIV-1, pubmed-meshheading:11178904-Humans, pubmed-meshheading:11178904-Kinetics, pubmed-meshheading:11178904-Models, Molecular, pubmed-meshheading:11178904-Molecular Sequence Data, pubmed-meshheading:11178904-Nitrogen, pubmed-meshheading:11178904-Nuclear Magnetic Resonance, Biomolecular, pubmed-meshheading:11178904-Nucleic Acid Conformation, pubmed-meshheading:11178904-Nucleic Acid Denaturation, pubmed-meshheading:11178904-Peptide Fragments, pubmed-meshheading:11178904-Protein Binding, pubmed-meshheading:11178904-Protons, pubmed-meshheading:11178904-RNA, Transfer, Lys, pubmed-meshheading:11178904-Viral Proteins, pubmed-meshheading:11178904-gag Gene Products, Human Immunodeficiency Virus
pubmed:year
2001
pubmed:articleTitle
Heteronuclear NMR studies of the interaction of tRNA(Lys)3 with HIV-1 nucleocapsid protein.
pubmed:affiliation
Laboratoire de Cristallographie et RMN Biologiques, EP 2075 CNRS Faculté de Pharmacie, 4 avenue de l'Observatoire, Paris, 75006, France. tisne@pharmacie.univ-paris5.fr
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't