1tfi
From Proteopedia
A NOVEL ZN FINGER MOTIF IN THE BASAL TRANSCRIPTIONAL MACHINERY: THREE-DIMENSIONAL NMR STUDIES OF THE NUCLEIC-ACID BINDING DOMAIN OF TRANSCRIPTIONAL ELONGATION FACTOR TFIIS
Overview
Transcriptional elongation provides a key control point in the regulation of eukaryotic gene expression. Here we describe homonuclear and 15N-heteronuclear 3D NMR studies of the nucleic acid binding domain of human transcriptional elongation factor TFIIS. This domain contains a Cys4 Zn(2+)-binding site with no homology to previously characterized Cys4, Cys6, or Cys2-His2 Zn fingers. Complete 1H and 15N NMR resonance assignment of a 50-residue TFIIS peptide-Zn2+ complex is obtained. Its solution structure, as determined by distance geometry/simulated annealing (DG/SA) calculations, exhibits a novel three-stranded antiparallel beta-sheet (designated the Zn ribbon). Analogous sequence motifs occur in a wide class of proteins involved in RNA or DNA transactions, including human basal transcriptional initiation factor TFIIE. A three-dimensional model of the TFIIE Cys4 domain is obtained by DG-based homology modeling. The role of the TFIIS Zn ribbon in the control of eukaryotic transcriptional elongation is discussed.
About this Structure
1TFI is a Single protein structure of sequence from Homo sapiens. Full crystallographic information is available from OCA.
Reference
Novel zinc finger motif in the basal transcriptional machinery: three-dimensional NMR studies of the nucleic acid binding domain of transcriptional elongation factor TFIIS., Qian X, Gozani SN, Yoon H, Jeon CJ, Agarwal K, Weiss MA, Biochemistry. 1993 Sep 28;32(38):9944-59. PMID:8399164 Page seeded by OCA on Sat May 3 09:53:28 2008
