Cloning and characterization of EF-Tu and EF-Ts from Pseudomonas aeruginosa.
Cloning and characterization of EF-Tu and EF-Ts from Pseudomonas aeruginosa.
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DOI:
10.1155/2013/585748
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发表时间:
2013
影响因子:
--
通讯作者:
Bullard JM
中科院分区:
文献类型:
--
作者:
Palmer SO;Rangel EY;Montalvo AE;Tran AT;Ferguson KC;Bullard JM
We have cloned genes encoding elongation factors EF-Tu and EF-Ts from Pseudomonas aeruginosa and expressed and purified the proteins to greater than 95% homogeneity. Sequence analysis indicated that P. aeruginosa EF-Tu and EF-Ts are 84% and 55% identical to E. coli counterparts, respectively. P. aeruginosa EF-Tu was active when assayed in GDP exchange assays. Kinetic parameters for the interaction of EF-Tu with GDP in the absence of EF-Ts were observed to be K M = 33 μM, k cat obs = 0.003 s−1, and the specificity constant k cat obs/K M was 0.1 × 10−3 s−1 μM−1. In the presence of EF-Ts, these values were shifted to K M = 2 μM, k cat obs = 0.005 s−1, and the specificity constant k cat obs/K M was 2.5 × 10−3 s−1 μM−1. The equilibrium dissociation constants governing the binding of EF-Tu to GDP (K GDP) were 30–75 nM and to GTP (K GTP) were 125–200 nM. EF-Ts stimulated the exchange of GDP by EF-Tu 10-fold. P. aeruginosa EF-Tu was active in forming a ternary complex with GTP and aminoacylated tRNA and was functional in poly(U)-dependent binding of Phe-tRNAPhe at the A-site of P. aeruginosa ribosomes. P. aeruginosa EF-Tu was active in poly(U)-programmed polyphenylalanine protein synthesis system composed of all P. aeruginosa components.
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影响因子:
64.8
作者:
Kawashima, T;BerthetColominas, C;Leberman, R
通讯作者:
Leberman, R
影响因子:
2.9
作者:
LOUIE, A;JURNAK, F
通讯作者:
JURNAK, F
DOI:
10.1016/0006-291x(70)90341-4
发表时间:
1970-01-01
影响因子:
3.1
作者:
MILLER, DL;WEISSBACH, H
通讯作者:
WEISSBACH, H
影响因子:
2.9
作者:
Gromadski, KB;Wieden, HJ;Rodnina, MV
通讯作者:
Rodnina, MV
DOI:
10.1016/0167-4781(90)90168-2
发表时间:
1990-08-27
期刊:
BIOCHIMICA ET BIOPHYSICA ACTA
影响因子:
--
作者:
JURNAK, F;HEFFRON, S;DELARIA, K
通讯作者:
DELARIA, K