title: Crystallization and preliminary X-ray crystallographic analysis of a bacterial Asn-transamidosome.
abstract: Most canonical aminoacyl-tRNAs are synthesized directly by their cognate aminoacyl-tRNA synthetases (aaRSs), but glutaminyl-tRNA(Gln) and asparaginyl-tRNA(Asn) are synthesized indirectly by two-step processes. These processes are catalyzed by the transamidosome, a large ribonucleoprotein particle composed of GatA, GatB, GatC, aaRS and tRNA. In this study, the Asn-transamidosome from Pseudomonas aeruginosa was reconstructed and crystallized by mixing purified GatCAB complex, AspRS and tRNA(Asn). The crystal of the Asn-transamidosome belonged to space group P2₁, with unit-cell parameters a=93.3, b=186.0, c=287.8 Å, β=93.3°, and diffracted to 3.73 Å resolution. Preliminary X-ray crystallographic analysis showed that the asymmetric unit contained two Asn-transamidosomes, each composed of two GatCABs, one AspRS dimer and two tRNAAsns, indicating that the construction of the current Asn-transamidosome differs from that of Thermus thermophilus.
authors.affiliation: Graduate School of Life Science, Hokkaido University, Sapporo 060-0810, Japan.
authors.forename: Tateki
authors.initials: T
authors.lastname: Suzuki
authors.affiliation: Graduate School of Life Science, Hokkaido University, Sapporo 060-0810, Japan.
authors.forename: Keitaro
authors.initials: K
authors.lastname: Yamashita
authors.affiliation: Graduate School of Life Science, Hokkaido University, Sapporo 060-0810, Japan.
authors.forename: Yoshikazu
authors.initials: Y
authors.lastname: Tanaka
authors.affiliation: Graduate School of Life Science, Hokkaido University, Sapporo 060-0810, Japan.
authors.forename: Isao
authors.initials: I
authors.lastname: Tanaka
authors.affiliation: Graduate School of Life Science, Hokkaido University, Sapporo 060-0810, Japan.
authors.forename: Min
authors.initials: M
authors.lastname: Yao
mesh_terms: D001216:Asparagine / Q000737:chemistry*; D001483:Base Sequence; D003460:Crystallization; D018360:Crystallography, X-Ray; D017931:DNA Primers; D016963:Thermus thermophilus / Q000737:chemistry*
chemical_list: D017931:DNA Primers; D001216:Asparagine
keywords: Asn-tRNAAsn; AspRS; GatCAB; Pseudomonas aeruginosa; aminoacyl-tRNA; transamidosome