title: Structural analysis of a peptide fragment of transmembrane transporter protein bilitranslocase.
abstract: Using a combination of genomic and post-genomic approaches is rapidly altering the number of identified human influx carriers. A transmembrane protein bilitranslocase (TCDB 2.A.65) has long attracted attention because of its function as an organic anion carrier. It has also been identified as a potential membrane transporter for cellular uptake of several drugs and due to its implication in drug uptake, it is extremely important to advance the knowledge about its structure. However, at present, only the primary structure of bilitranslocase is known. In our work, transmembrane subunits of bilitranslocase were predicted by a previously developed chemometrics model and the stability of these polypeptide chains were studied by molecular dynamics (MD) simulation. Furthermore, sodium dodecyl sulfate (SDS) micelles were used as a model of cell membrane and herein we present a high-resolution 3D structure of an 18 amino acid residues long peptide corresponding to the third transmembrane part of bilitranslocase obtained by use of multidimensional NMR spectroscopy. It has been experimentally confirmed that one of the transmembrane segments of bilitranslocase has alpha helical structure with hydrophilic amino acid residues oriented towards one side, thus capable of forming a channel in the membrane.
authors: Laboratory of Chemometrics, National Institute of Chemistry, Ljubljana, Slovenia.
authors: Andrej
authors: A
authors: Perdih
authors: Amrita
authors: A
authors: Roy Choudhury
authors: Špela
authors: Š
authors: Župerl
authors: Emilia
authors: E
authors: Sikorska
authors: Igor
authors: I
authors: Zhukov
authors: Tom
authors: T
authors: Solmajer
authors: Marjana
authors: M
authors: Novič
mesh_terms: D000595:Amino Acid Sequence; D002570:Ceruloplasmin; D009682:Magnetic Resonance Spectroscopy; D008565:Membrane Proteins / Q000737:chemistry*; D026901:Membrane Transport Proteins / Q000737:chemistry*; D008823:Micelles; D056004:Molecular Dynamics Simulation; D008969:Molecular Sequence Data; D010446:Peptide Fragments / Q000737:chemistry*; D017433:Protein Structure, Secondary; D017434:Protein Structure, Tertiary; D012967:Sodium Dodecyl Sulfate / Q000737:chemistry
chemical_list: D008565:Membrane Proteins; D026901:Membrane Transport Proteins; D008823:Micelles; D010446:Peptide Fragments; D012967:Sodium Dodecyl Sulfate; D002570:Ceruloplasmin; C033838:bilitranslocase