EF1B catalyzes the exchange of GDP bound to the G-protein, EF1A, for GTP, an important step in the elongation cycle of the protein biosynthesis. EF1A binds to and delivers the aminoacyl tRNA to the ribosome. The guanine nucleotide exchange domain of EF1B, which is the alpha subunit in yeast, is responsible for the catalysis of this exchange reaction. Length = 88
Score = 67.9 bits (167), Expect = 5e-17
Identities = 29/76 (38%), Positives = 45/76 (59%), Gaps = 6/76 (7%)
Query: 1 MKKLEEAVRS-VEMPGLFWGAS-KLVPVGYGIKKLQIMITIVDDLVSVDSLIEEHLTVEP 58
+++LEE V+S + M GL WGA +L P+ +G+K LQI + + DD D L E V
Sbjct: 17 LEELEEKVKSILPMDGLLWGAGIELEPIAFGLKALQIYVVVEDDEGGTDELEEAIEEV-- 74
Query: 59 CNEYVQSCDIVAFNKI 74
E VQS ++ A +++
Sbjct: 75 --EGVQSVEVEAVSRL 88
Translation elongation factors are responsible for two main processes during protein synthesis on the ribosome. EF1A (or EF-Tu) is responsible for the selection and binding of the cognate aminoacyl-tRNA to the A-site (acceptor site) of the ribosome. EF2 (or EF-G) is responsible for the translocation of the peptidyl-tRNA from the A-site to the P-site (peptidyl-tRNA site) of the ribosome, thereby freeing the A-site for the next aminoacyl-tRNA to bind. Elongation factors are responsible for achieving accuracy of translation and both EF1A and EF2 are remarkably conserved throughout evolution. Elongation factor EF1B (also known as EF-Ts or EF-1beta/gamma/delta) is a nucleotide exchange factor that is required to regenerate EF1A from its inactive form (EF1A-GDP) to its active form (EF1A-GTP). EF1A is then ready to interact with a new aminoacyl-tRNA to begin the cycle again. EF1B is more complex in eukaryotes than in bacteria, and can consist of three subunits: EF1B-alpha (or EF-1beta), EF1B-gamma (or EF-1gamma) and EF1B-beta (or EF-1delta). This entry represents the guanine nucleotide exchange domain of the beta (EF-1beta, also known as EF1B-alpha) and delta (EF-1delta, also known as EF1B-beta) chains of EF1B proteins from eukaryotes and archaea. The beta and delta chains have exchange activity, which mainly resides in their homologous guanine nucleotide exchange domains, found in the C-terminal region of the peptides. Their N-terminal regions may be involved in interactions with the gamma chain (EF-1gamma). Length = 88
EF1B catalyzes the exchange of GDP bound to the G-protein, EF1A, for GTP, an important step in the elongation cycle of the protein biosynthesis. EF1A binds to and delivers the aminoacyl tRNA to the ribosome. The guanine nucleotide exchange domain of EF1B, which is the alpha subunit in yeast, is responsible for the catalysis of this exchange reaction.
>PF00736 EF1_GNE: EF-1 guanine nucleotide exchange domain; InterPro: IPR014038 Translation elongation factors are responsible for two main processes during protein synthesis on the ribosome [, , ]
EF1A (or EF-Tu) is responsible for the selection and binding of the cognate aminoacyl-tRNA to the A-site (acceptor site) of the ribosome. EF2 (or EF-G) is responsible for the translocation of the peptidyl-tRNA from the A-site to the P-site (peptidyl-tRNA site) of the ribosome, thereby freeing the A-site for the next aminoacyl-tRNA to bind. Elongation factors are responsible for achieving accuracy of translation and both EF1A and EF2 are remarkably conserved throughout evolution. Elongation factor EF1B (also known as EF-Ts or EF-1beta/gamma/delta) is a nucleotide exchange factor that is required to regenerate EF1A from its inactive form (EF1A-GDP) to its active form (EF1A-GTP). EF1A is then ready to interact with a new aminoacyl-tRNA to begin the cycle again. EF1B is more complex in eukaryotes than in bacteria, and can consist of three subunits: EF1B-alpha (or EF-1beta), EF1B-gamma (or EF-1gamma) and EF1B-beta (or EF-1delta) []. This entry represents the guanine nucleotide exchange domain of the beta (EF-1beta, also known as EF1B-alpha) and delta (EF-1delta, also known as EF1B-beta) chains of EF1B proteins from eukaryotes and archaea. The beta and delta chains have exchange activity, which mainly resides in their homologous guanine nucleotide exchange domains, found in the C-terminal region of the peptides. Their N-terminal regions may be involved in interactions with the gamma chain (EF-1gamma). More information about these proteins can be found at Protein of the Month: Elongation Factors [].; GO: 0003746 translation elongation factor activity, 0006414 translational elongation, 0005853 eukaryotic translation elongation factor 1 complex; PDB: 2YY3_B 1GH8_A 1B64_A 1IJE_B 1IJF_B 1F60_B 1G7C_B 2B7B_B 2B7C_B.
This model describes the archaeal translation elongation factor aEF-1 beta. The member from Sulfolobus solfataricus was demonstrated experimentally. It is a dimer that catalyzes the exchange of GDP for GTP on aEF-1 alpha.
>pdb|1B64|A Chain A, Solution Structure Of The Guanine Nucleotide Exchange Factor Domain From Human Elongation Factor-One Beta, Nmr, 20 Structures Length = 91
>2yy3_A Elongation factor 1-beta; structural genomics, NPPSFA, national Pro protein structural and functional analyses; 2.50A {Pyrococcus horikoshii} Length = 91