EurekaMag
+ Most Popular
Cunninghamia lanceolata plantations in China
Mammalian lairs in paleo ecological studies and palynology
Studies on technological possibilities in utilization of anhydrous milk fat for production of recombined butter-like products
Should right-sided fibroelastomas be operated upon?
Large esophageal lipoma
Apoptosis in the mammalian thymus during normal histogenesis and under various in vitro and in vivo experimental conditions
Poissons characoides nouveaux ou non signales de l'Ilha do Bananal, Bresil
Desensitizing efficacy of Colgate Sensitive Maximum Strength and Fresh Mint Sensodyne dentifrices
Administration of fluid by subcutaneous infusion: revival of a forgotten method
Tundra mosquito control - an impossible dream?
Schizophrenia for primary care providers: how to contribute to the care of a vulnerable patient population
Geochemical pattern analysis; method of describing the Southeastern limestone regional aquifer system
Incidence of low birth weights in a hospital of Mexico City
Tabanidae
Graded management intensity of grassland systems for enhancing floristic diversity
Microbiology and biochemistry of cheese and fermented milk
The ember tetra: a new pygmy characid tetra from the Rio das Mortes, Brazil, Hyphessobrycon amandae sp. n. (Pisces, Characoidei)
Risk factors of contrast-induced nephropathy in patients after coronary artery intervention
Renovation of onsite domestic wastewater in a poorly drained soil
Observations of the propagation velocity and formation mechanism of burst fractures caused by gunshot
Systolic blood pressure in a population of infants in the first year of life: the Brompton study
Haematological studies in rats fed with metanil yellow
Studies on pasteurellosis. I. A new species of Pasteurella encountered in chronic fowl cholera
Dormancy breaking and germination of Acacia salicina Lindl. seeds
therapy of lupus nephritis. a two-year prospective study

Escherichia coli elongation-factor-Tu mutants with decreased affinity for aminoacyl-tRNA


Escherichia coli elongation-factor-Tu mutants with decreased affinity for aminoacyl-tRNA



European Journal of Biochemistry 220(3): 739-744



ISSN/ISBN: 0014-2956

PMID: 8143728

DOI: 10.1111/j.1432-1033.1994.tb18674.x

The two evolutionary well-conserved histidine residues, His66 and His118, of Escherichia coli elongation factor Tu have been subjected to mutational analysis. The two histidines have each been replaced by alanines, denoted H66A and H118A, respectively. His118 has also been substituted by glutamate, H118E. The three mutants have been characterized with respect to thermostability, GTPase activity and affinity for aminoacylated tRNA. Most conspicuously, the tRNA affinity is reduced or almost abolished. k-1 for dissociation of the ternary complex increases by factors of 14, 40 and 48 for H66A, H118A and H118E, respectively, when compared to the wild type. The half-lives for the non-enzymic deacylation of aminoacylated tRNA in the ternary complex are 391, 107, 69, 54 and 61 min for wild type, H66A, H118A, H118E and free aminoacylated tRNA, respectively. The Kd is about 20-times higher for H66A compared to wild type. Our results strongly suggest that His66 and His118 play major roles in stabilization of the ternary complex.

Please choose payment method:






(PDF emailed within 0-6 h: $19.90)

Accession: 045988116

Download citation: RISBibTeXText

Related references

Kirromycin drastically reduces the affinity of Escherichia coli elongation factor Tu for aminoacyl-tRNA. Biochemistry 30(27): 6705-6710, 1991

Elongation factor Ts directly facilitates the formation and disassembly of the Escherichia coli elongation factor Tu·GTP·aminoacyl-tRNA ternary complex. Journal of Biological Chemistry 288(19): 13917-13928, 2013

Effects of mutagenesis of Gln97 in the switch II region of Escherichia coli elongation factor Tu on its interaction with guanine nucleotides, elongation factor Ts, and aminoacyl-tRNA. Biochemistry 42(46): 13587-13595, 2003

The complex formation between Escherichia coli aminoacyl-tRNA, elongation factor Tu and GTP. The effect of the side-chain of the amino acid linked to tRNA. European Journal of Biochemistry 108(1): 213-221, 1980

The interface between Escherichia coli elongation factor Tu and aminoacyl-tRNA. Biochemistry 53(35): 5710-5720, 2014

Stabilization of the Escherichia coli elongation factor Tu-GTP-aminoacyl-tRNA complex. Archives of Biochemistry and Biophysics 286(1): 207-211, 1991

Anticodon sequence mutants of Escherichia coli initiator tRNA: effects of overproduction of aminoacyl-tRNA synthetases, methionyl-tRNA formyltransferase, and initiation factor 2 on activity in initiation. Biochemistry 42(17): 4787-4799, 2003

The binding site for the 3'-terminus of aminoacyl-tRNA in the molecule of elongation factor Tu from Escherichia coli. Febs Letters 98(2): 329-332, 1979

Mapping Escherichia coli elongation factor Tu residues involved in binding of aminoacyl-tRNA. Journal of Biological Chemistry 271(34): 20406-20411, 1996

Kinetic studies of Escherichia coli elongation factor Tu-guanosine 5'-triphosphate-aminoacyl-tRNA complexes. Biochemistry 24(23): 6433-6439, 1985

Effect of trypsin modification of the Escherichia coli elongation factor Tu on the ternary complex with aminoacyl-tRNA. Journal of Biological Chemistry 260(15): 8702-8705, 1985

Histidine residues in elongation factor EF-tu from Escherichia coli protected by aminoacyl-tRNA against photo-oxidation. European Journal of Biochemistry 144(2): 295-303, 1984

Negative correlation between the abundance of Escherichia coli aminoacyl-tRNA families and their affinities for elongation factor Tu-GTP. Journal of Theoretical Biology 133(3): 363-370, 1988

Interaction of elongation factor Tu from Escherichia coli with aminoacyl-tRNA carrying a fluorescent reporter group on the 3' terminus. European Journal of Biochemistry 184(2): 345-352, 1989

Regulation of the biosynthesis of aminoacyl-tRNA synthetases and of tRNA in Escherichia coli. IV. Mutants with increased levels of leucyl- or seryl-tRNA synthetase. Molecular and General Genetics: Mgg 169(2): 205-211, 1979