title: Interaction between elongation factors 1beta and 1gamma from Bombyx mori silk gland.
abstract: Elongation factor 1 (EF-1) from the silk gland of Bombyx mori consists of four subunits: alpha (51 kDa), beta (26 kDa), gamma (49 kDa), and delta (33 kDa). The EF-1alpha subunit catalyzes the binding of aminoacyl-tRNA to the ribosome concomitant with the hydrolysis of GTP. The EF-1alpha-bound GDP is then exchanged for GTP by the EF-1betagammadelta complex. To facilitate analysis of the roles of the individual EF-1beta, gamma, and delta subunits in GDP/GTP exchange on EF-1alpha, we cloned the cDNAs for these subunits and expressed them in Escherichia coli. EF-1beta, EF-1gamma, and the carboxyl-terminal half of EF-1delta were expressed, purified, and examined for protein:protein interactions by gel filtration chromatography and by a quartz-crystal microbalance method. An 80-kDa species containing EF-1beta and gamma subunits in a 1:1 molar ratio was detected by gel filtration. A higher molecular weight species containing an excess of EF-1gamma relative to EF-1beta was also detected. The amino-terminal region of EF-1beta (amino acid residues 1-129) was sufficient for binding to EF-1gamma. The carboxyl-terminal half of EF-1delta did not appear to form a complex with EF-1gamma.
authors.affiliation: Department of Bioscience and Biotechnology, Faculty of Engineering, Aomori University, Japan. kamiie@aomori-u.ac.jp
authors.forename: Katsuyoshi
authors.initials: K
authors.lastname: Kamiie
authors.forename: Tetsuro
authors.initials: T
authors.lastname: Yamashita
authors.forename: Hideharu
authors.initials: H
authors.lastname: Taira
authors.forename: Shin-ichiro
authors.initials: S
authors.lastname: Kidou
authors.forename: Shin-ichiro
authors.initials: S
authors.lastname: Ejiri
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D012831:Bombyx / Q000737:chemistry*; D002850:Chromatography, Gel; D017124:Conserved Sequence; D019476:Insect Proteins / Q000378:metabolism*; D008969:Molecular Sequence Data; D020648:Peptide Elongation Factor 1 / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D011485:Protein Binding; D021122:Protein Subunits / Q000737:chemistry / Q000235:genetics / Q000378:metabolism; D011994:Recombinant Proteins / Q000235:genetics / Q000378:metabolism; D016415:Sequence Alignment; D017386:Sequence Homology, Amino Acid; D047011:Silk; D013045:Species Specificity; D014894:Weights and Measures
chemical_list: D019476:Insect Proteins; D020648:Peptide Elongation Factor 1; D021122:Protein Subunits; D011994:Recombinant Proteins; D047011:Silk