title: Crystallization and preliminary X-ray crystallographic analysis of Thermus thermophilus transcription elongation complex bound to Gfh1.
abstract: RNA polymerase (RNAP) elongates RNA by iterative nucleotide-addition cycles (NAC). A specific structural state (or states) of RNAP may be the target of transcription elongation factors. Gfh1, a Thermus thermophilus Gre-family protein, inhibits NAC. To elucidate which RNAP structural state Gfh1 associates with, the T. thermophilus RNAP elongation complex (EC) was cocrystallized with Gfh1. Of the 70 DNA/RNA scaffolds tested, two (for EC1 and EC2) were successfully crystallized. In the presence of Gfh1, EC1 and EC2 yielded crystals belonging to space group P2(1) with similar unit-cell parameters (crystals 1 and 2, respectively). X-ray diffraction data sets were obtained at 3.6 and 3.8 A resolution, respectively.
authors.affiliation: Department of Biophysics and Biochemistry, Graduate School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan.
authors.forename: Shunsuke
authors.initials: S
authors.lastname: Tagami
authors.forename: Shun-ichi
authors.initials: S
authors.lastname: Sekine
authors.forename: Thirumananseri
authors.initials: T
authors.lastname: Kumarevel
authors.forename: Masaki
authors.initials: M
authors.lastname: Yamamoto
authors.forename: Shigeyuki
authors.initials: S
authors.lastname: Yokoyama
mesh_terms: D003460:Crystallization; D018360:Crystallography, X-Ray; D012321:DNA-Directed RNA Polymerases / Q000737:chemistry*; D016963:Thermus thermophilus / Q000737:chemistry; D035602:Transcriptional Elongation Factors / Q000737:chemistry*
chemical_list: D035602:Transcriptional Elongation Factors; D012321:DNA-Directed RNA Polymerases