Skip Header

You are using a version of browser that may not display all the features of this website. Please consider upgrading your browser.
Protein

Elongation factor Tu 2

Gene

tufB

Organism
Escherichia coli (strain K12)
Status
Reviewed-Annotation score: Annotation score: 5 out of 5-Experimental evidence at protein leveli

Functioni

This protein promotes the GTP-dependent binding of aminoacyl-tRNA to the A-site of ribosomes during protein biosynthesis.
May play an important regulatory role in cell growth and in the bacterial response to nutrient deprivation.
In case of infection by bacteriophage Qbeta, part of the viral RNA-dependent RNA polymerase complex. With EF-Ts may provide a stabilizing scaffold for the beta (catalytic) subunit. Helps separate the double-stranded RNA of the template and growing RNA during elongation (PubMed:22245970). With the beta subunit helps form the exit tunnel for template RNA. The GTPase activity of this subunit is not required for viral RNA replication (PubMed:20798060).6 Publications
Plays a stimulatory role in trans-translation, binds tmRNA.1 Publication

Regions

Feature keyPosition(s)DescriptionActionsGraphical viewLength
Nucleotide bindingi19 – 26GTP8
Nucleotide bindingi81 – 85GTP5
Nucleotide bindingi136 – 139GTP4

GO - Molecular functioni

GO - Biological processi

Complete GO annotation...

Keywords - Molecular functioni

Elongation factor

Keywords - Biological processi

Antibiotic resistance, Protein biosynthesis

Keywords - Ligandi

GTP-binding, Nucleotide-binding, RNA-binding

Enzyme and pathway databases

BioCyciEcoCyc:EG11037-MONOMER.
BRENDAi3.6.5.3. 2026.

Names & Taxonomyi

Protein namesi
Recommended name:
Elongation factor Tu 2UniRule annotation
Short name:
EF-Tu 2UniRule annotation
Alternative name(s):
Bacteriophage Q beta RNA-directed RNA polymerase subunit III1 Publication
P-43
Gene namesi
Name:tufBUniRule annotation
Ordered Locus Names:b3980, JW3943
OrganismiEscherichia coli (strain K12)
Taxonomic identifieri83333 [NCBI]
Taxonomic lineageiBacteriaProteobacteriaGammaproteobacteriaEnterobacteralesEnterobacteriaceaeEscherichia
Proteomesi
  • UP000000318 Componenti: Chromosome
  • UP000000625 Componenti: Chromosome

Organism-specific databases

EcoGeneiEG11037. tufB.

Subcellular locationi

GO - Cellular componenti

  • cytosol Source: EcoCyc
  • plasma membrane Source: UniProtKB-SubCell
Complete GO annotation...

Keywords - Cellular componenti

Cell inner membrane, Cell membrane, Cytoplasm, Membrane

Pathology & Biotechi

Mutagenesis

Feature keyPosition(s)DescriptionActionsGraphical viewLength
Mutagenesisi20H → A: No change in binding GDP and 3-fold reduction in binding EF-Ts. 1 Publication1
Mutagenesisi115Q → A: Weaker binding for GDP and for EF-Ts. 1 Publication1
Mutagenesisi137K → R, Q, E or I: Reduces affinity for GDP. 1 Publication1
Mutagenesisi139D → N: Reduces affinity for GDP; increases affinity for XDP. 1 Publication1
Mutagenesisi223G → D: Inhibits codon-induced conformational changes leading to GTPase activation on the ribosome. 1 Publication1
Mutagenesisi262 – 263Missing : Still associates with EF-Ts, no longer forms the Qbeta viral RNA polymerase complex. 1 Publication2
Mutagenesisi262F → A: Still associates with EF-Ts, very little Qbeta viral RNA polymerase complex forms. 1 Publication1
Mutagenesisi289R → A: 50% loss of Qbeta viral RNA polymerase activity. 1 Publication1
Mutagenesisi349E → A: No change in binding GDP but higher binding constant for EF-Ts. 1 Publication1
Mutagenesisi378R → A: 60% loss of Qbeta viral RNA polymerase elongation activity. 1 Publication1
Mutagenesisi382R → A: 25% loss of Qbeta viral RNA polymerase elongation activity. 1 Publication1
Mutagenesisi383T → V: No longer phosphorylated by phage protein doc. 1 Publication1

PTM / Processingi

Molecule processing

Feature keyPosition(s)DescriptionActionsGraphical viewLength
Initiator methionineiRemoved2 Publications
ChainiPRO_00003922892 – 394Elongation factor Tu 2Add BLAST393

Amino acid modifications

Feature keyPosition(s)DescriptionActionsGraphical viewLength
Modified residuei2N-acetylserine2 Publications1
Modified residuei38N6-succinyllysine1 Publication1
Modified residuei57N6,N6-dimethyllysine; alternate4 Publications1
Modified residuei57N6-methyllysine; alternate4 Publications1
Modified residuei177N6-succinyllysine1 Publication1
Modified residuei249N6-succinyllysine1 Publication1
Modified residuei253N6-succinyllysine1 Publication1
Modified residuei295N6-succinyllysine1 Publication1
Modified residuei314N6-acetyllysine; alternate1 Publication1
Modified residuei314N6-succinyllysine; alternate1 Publication1
Modified residuei383Phosphothreonine3 Publications1

Post-translational modificationi

The N-terminus is blocked.
Methylated in vivo on Lys-57 in response to nutrient starvation.4 Publications
Phosphorylated in vitro by phage protein doc on Thr-383.3 Publications
Phosphorylated in vitro by HipA on Thr-383 (PubMed:19150849), this has since been reported not to occur in vivo (PubMed:24095282).4 Publications

Keywords - PTMi

Acetylation, Methylation, Phosphoprotein

Proteomic databases

PaxDbiP0CE48.
PRIDEiP0CE48.

PTM databases

iPTMnetiP0CE48.

Interactioni

Subunit structurei

Monomer. In case of infection by bacteriophage Qbeta, part of the viral RNA-dependent RNA polymerase complex, the other subunits are the viral replicase catalytic subunit (AC P14647), host ribosomal protein S1 and EF-Ts (PubMed:816798).UniRule annotation8 Publications

Protein-protein interaction databases

BioGridi852776. 1 interactor.
DIPiDIP-60620N.
MINTiMINT-1234073.
STRINGi511145.b3980.

Structurei

Secondary structure

1394
Legend: HelixTurnBeta strandPDB Structure known for this area
Show more details
Feature keyPosition(s)DescriptionActionsGraphical viewLength
Helixi3 – 7Combined sources5
Beta strandi12 – 18Combined sources7
Helixi21 – 23Combined sources3
Helixi25 – 40Combined sources16
Helixi47 – 51Combined sources5
Beta strandi55 – 58Combined sources4
Helixi61 – 63Combined sources3
Beta strandi67 – 71Combined sources5
Beta strandi76 – 81Combined sources6
Helixi86 – 88Combined sources3
Helixi89 – 96Combined sources8
Beta strandi102 – 107Combined sources6
Turni108 – 110Combined sources3
Helixi114 – 126Combined sources13
Beta strandi131 – 136Combined sources6
Helixi138 – 140Combined sources3
Helixi144 – 160Combined sources17
Turni165 – 167Combined sources3
Beta strandi170 – 172Combined sources3
Helixi175 – 179Combined sources5
Helixi183 – 199Combined sources17
Helixi206 – 208Combined sources3
Beta strandi212 – 214Combined sources3
Beta strandi218 – 221Combined sources4
Turni222 – 224Combined sources3
Beta strandi225 – 231Combined sources7
Beta strandi234 – 238Combined sources5
Beta strandi242 – 249Combined sources8
Beta strandi252 – 261Combined sources10
Beta strandi264 – 270Combined sources7
Beta strandi274 – 281Combined sources8
Helixi284 – 286Combined sources3
Beta strandi292 – 295Combined sources4
Beta strandi300 – 311Combined sources12
Helixi314 – 316Combined sources3
Beta strandi330 – 333Combined sources4
Beta strandi336 – 343Combined sources8
Beta strandi356 – 369Combined sources14
Beta strandi374 – 379Combined sources6
Beta strandi382 – 392Combined sources11

3D structure databases

Select the link destinations:
PDBei
RCSB PDBi
PDBji
Links Updated
PDB entryMethodResolution (Å)ChainPositionsPDBsum
1DG1X-ray2.50G/H1-394[»]
1EFMX-ray2.70A2-394[»]
1EFUX-ray2.50A/C10-394[»]
1LS2electron microscopy16.80A2-394[»]
1OB2X-ray3.35A3-394[»]
1QZDelectron microscopy-A2-394[»]
2BVNX-ray2.30A/B2-394[»]
3AGPX-ray2.80A1-394[»]
3AGQX-ray3.22A1-394[»]
3AVTX-ray2.61A1-394[»]
3AVUX-ray2.91A1-394[»]
3AVVX-ray3.12A1-394[»]
3AVWX-ray2.60A1-394[»]
3AVXX-ray2.41A1-394[»]
3AVYX-ray2.62A1-394[»]
3MMPX-ray2.50A/C1-394[»]
3VNUX-ray3.20A1-394[»]
3VNVX-ray2.60A1-394[»]
4FWTX-ray3.20A1-394[»]
4R71X-ray3.21A/C1-394[»]
4V69electron microscopy6.70Z2-394[»]
4V6Kelectron microscopy8.25BC2-394[»]
4V6Lelectron microscopy13.20AC2-394[»]
5AFIelectron microscopy2.90z2-394[»]
ProteinModelPortaliP0CE48.
SMRiP0CE48.
ModBaseiSearch...
MobiDBiSearch...

Miscellaneous databases

EvolutionaryTraceiP0CE48.

Family & Domainsi

Domains and Repeats

Feature keyPosition(s)DescriptionActionsGraphical viewLength
Domaini10 – 204tr-type GAdd BLAST195

Region

Feature keyPosition(s)DescriptionActionsGraphical viewLength
Regioni19 – 26G1By similarity8
Regioni60 – 64G2By similarity5
Regioni81 – 84G3By similarity4
Regioni136 – 139G4By similarity4
Regioni174 – 176G5By similarity3

Sequence similaritiesi

Belongs to the TRAFAC class translation factor GTPase superfamily. Classic translation factor GTPase family. EF-Tu/EF-1A subfamily.UniRule annotation

Phylogenomic databases

eggNOGiENOG4105CGV. Bacteria.
COG0050. LUCA.
InParanoidiP0CE48.
KOiK02358.
OMAiIEMFHKE.
PhylomeDBiP0CE48.

Family and domain databases

CDDicd03697. EFTU_II. 1 hit.
Gene3Di3.40.50.300. 1 hit.
HAMAPiMF_00118_B. EF_Tu_B. 1 hit.
InterProiIPR004161. EFTu-like_2.
IPR033720. EFTU_2.
IPR031157. G_TR_CS.
IPR027417. P-loop_NTPase.
IPR005225. Small_GTP-bd_dom.
IPR000795. TF_GTP-bd_dom.
IPR009000. Transl_B-barrel.
IPR009001. Transl_elong_EF1A/Init_IF2_C.
IPR004541. Transl_elong_EFTu/EF1A_bac/org.
IPR004160. Transl_elong_EFTu/EF1A_C.
[Graphical view]
PfamiPF03144. GTP_EFTU_D2. 1 hit.
PF03143. GTP_EFTU_D3. 1 hit.
[Graphical view]
PRINTSiPR00315. ELONGATNFCT.
SUPFAMiSSF50447. SSF50447. 1 hit.
SSF50465. SSF50465. 1 hit.
SSF52540. SSF52540. 1 hit.
TIGRFAMsiTIGR00485. EF-Tu. 1 hit.
TIGR00231. small_GTP. 1 hit.
PROSITEiPS00301. G_TR_1. 1 hit.
PS51722. G_TR_2. 1 hit.
[Graphical view]

Sequencei

Sequence statusi: Complete.

Sequence processingi: The displayed sequence is further processed into a mature form.

P0CE48-1 [UniParc]FASTAAdd to basket

« Hide

        10         20         30         40         50
MSKEKFERTK PHVNVGTIGH VDHGKTTLTA AITTVLAKTY GGAARAFDQI
60 70 80 90 100
DNAPEEKARG ITINTSHVEY DTPTRHYAHV DCPGHADYVK NMITGAAQMD
110 120 130 140 150
GAILVVAATD GPMPQTREHI LLGRQVGVPY IIVFLNKCDM VDDEELLELV
160 170 180 190 200
EMEVRELLSQ YDFPGDDTPI VRGSALKALE GDAEWEAKIL ELAGFLDSYI
210 220 230 240 250
PEPERAIDKP FLLPIEDVFS ISGRGTVVTG RVERGIIKVG EEVEIVGIKE
260 270 280 290 300
TQKSTCTGVE MFRKLLDEGR AGENVGVLLR GIKREEIERG QVLAKPGTIK
310 320 330 340 350
PHTKFESEVY ILSKDEGGRH TPFFKGYRPQ FYFRTTDVTG TIELPEGVEM
360 370 380 390
VMPGDNIKMV VTLIHPIAMD DGLRFAIREG GRTVGAGVVA KVLS
Length:394
Mass (Da):43,314
Last modified:March 23, 2010 - v1
Checksum:i6EDA60255F43358F
GO

Sequence databases

Select the link destinations:
EMBLi
GenBanki
DDBJi
Links Updated
X57091 Genomic DNA. Translation: CAA40370.1.
J01717 Genomic DNA. Translation: AAA24669.1.
U00006 Genomic DNA. Translation: AAC43078.1.
U00096 Genomic DNA. Translation: AAC76954.1.
AP009048 Genomic DNA. Translation: BAE77340.1.
PIRiA91478. EFECT.
RefSeqiNP_418407.1. NC_000913.3.
WP_000031784.1. NZ_LN832404.1.

Genome annotation databases

EnsemblBacteriaiAAC76954; AAC76954; b3980.
BAE77340; BAE77340; BAE77340.
GeneIDi948482.
KEGGiecj:JW3943.
eco:b3980.
PATRICi32123481. VBIEscCol129921_4093.

Cross-referencesi

Sequence databases

Select the link destinations:
EMBLi
GenBanki
DDBJi
Links Updated
X57091 Genomic DNA. Translation: CAA40370.1.
J01717 Genomic DNA. Translation: AAA24669.1.
U00006 Genomic DNA. Translation: AAC43078.1.
U00096 Genomic DNA. Translation: AAC76954.1.
AP009048 Genomic DNA. Translation: BAE77340.1.
PIRiA91478. EFECT.
RefSeqiNP_418407.1. NC_000913.3.
WP_000031784.1. NZ_LN832404.1.

3D structure databases

Select the link destinations:
PDBei
RCSB PDBi
PDBji
Links Updated
PDB entryMethodResolution (Å)ChainPositionsPDBsum
1DG1X-ray2.50G/H1-394[»]
1EFMX-ray2.70A2-394[»]
1EFUX-ray2.50A/C10-394[»]
1LS2electron microscopy16.80A2-394[»]
1OB2X-ray3.35A3-394[»]
1QZDelectron microscopy-A2-394[»]
2BVNX-ray2.30A/B2-394[»]
3AGPX-ray2.80A1-394[»]
3AGQX-ray3.22A1-394[»]
3AVTX-ray2.61A1-394[»]
3AVUX-ray2.91A1-394[»]
3AVVX-ray3.12A1-394[»]
3AVWX-ray2.60A1-394[»]
3AVXX-ray2.41A1-394[»]
3AVYX-ray2.62A1-394[»]
3MMPX-ray2.50A/C1-394[»]
3VNUX-ray3.20A1-394[»]
3VNVX-ray2.60A1-394[»]
4FWTX-ray3.20A1-394[»]
4R71X-ray3.21A/C1-394[»]
4V69electron microscopy6.70Z2-394[»]
4V6Kelectron microscopy8.25BC2-394[»]
4V6Lelectron microscopy13.20AC2-394[»]
5AFIelectron microscopy2.90z2-394[»]
ProteinModelPortaliP0CE48.
SMRiP0CE48.
ModBaseiSearch...
MobiDBiSearch...

Protein-protein interaction databases

BioGridi852776. 1 interactor.
DIPiDIP-60620N.
MINTiMINT-1234073.
STRINGi511145.b3980.

PTM databases

iPTMnetiP0CE48.

Proteomic databases

PaxDbiP0CE48.
PRIDEiP0CE48.

Protocols and materials databases

Structural Biology KnowledgebaseSearch...

Genome annotation databases

EnsemblBacteriaiAAC76954; AAC76954; b3980.
BAE77340; BAE77340; BAE77340.
GeneIDi948482.
KEGGiecj:JW3943.
eco:b3980.
PATRICi32123481. VBIEscCol129921_4093.

Organism-specific databases

EchoBASEiEB1030.
EcoGeneiEG11037. tufB.

Phylogenomic databases

eggNOGiENOG4105CGV. Bacteria.
COG0050. LUCA.
InParanoidiP0CE48.
KOiK02358.
OMAiIEMFHKE.
PhylomeDBiP0CE48.

Enzyme and pathway databases

BioCyciEcoCyc:EG11037-MONOMER.
BRENDAi3.6.5.3. 2026.

Miscellaneous databases

EvolutionaryTraceiP0CE48.
PROiP0CE48.

Family and domain databases

CDDicd03697. EFTU_II. 1 hit.
Gene3Di3.40.50.300. 1 hit.
HAMAPiMF_00118_B. EF_Tu_B. 1 hit.
InterProiIPR004161. EFTu-like_2.
IPR033720. EFTU_2.
IPR031157. G_TR_CS.
IPR027417. P-loop_NTPase.
IPR005225. Small_GTP-bd_dom.
IPR000795. TF_GTP-bd_dom.
IPR009000. Transl_B-barrel.
IPR009001. Transl_elong_EF1A/Init_IF2_C.
IPR004541. Transl_elong_EFTu/EF1A_bac/org.
IPR004160. Transl_elong_EFTu/EF1A_C.
[Graphical view]
PfamiPF03144. GTP_EFTU_D2. 1 hit.
PF03143. GTP_EFTU_D3. 1 hit.
[Graphical view]
PRINTSiPR00315. ELONGATNFCT.
SUPFAMiSSF50447. SSF50447. 1 hit.
SSF50465. SSF50465. 1 hit.
SSF52540. SSF52540. 1 hit.
TIGRFAMsiTIGR00485. EF-Tu. 1 hit.
TIGR00231. small_GTP. 1 hit.
PROSITEiPS00301. G_TR_1. 1 hit.
PS51722. G_TR_2. 1 hit.
[Graphical view]
ProtoNetiSearch...

Entry informationi

Entry nameiEFTU2_ECOLI
AccessioniPrimary (citable) accession number: P0CE48
Secondary accession number(s): O68929
, P02990, P0A6N1, Q2M704, Q2M8R6, Q8X4S9, Q8XED3
Entry historyi
Integrated into UniProtKB/Swiss-Prot: March 23, 2010
Last sequence update: March 23, 2010
Last modified: November 2, 2016
This is version 60 of the entry and version 1 of the sequence. [Complete history]
Entry statusiReviewed (UniProtKB/Swiss-Prot)
Annotation programProkaryotic Protein Annotation Program

Miscellaneousi

Miscellaneous

In order to produce high amounts of bacteriophage Qbeta RNA polymerase catalytic core, a fusion protein consisting of tsf-tufB-replicase with a cleavable linker between tufB and the viral replicase subunit is frequently used.5 Publications
Present with about 70,000 molecules/cell.1 Publication
The antibiotic kirromycin inhibits protein biosynthesis by inhibiting the release of EF-Tu from the ribosome. TufA resistance to kirromycin is conferred by mutations to Gln-125, Gly-317 and Ala-376. This has not been formally proven for tufB, but is certainly correct.Curated
The antibiotic pulvomycin inhibits protein biosynthesis by disrupting the allosteric control mechanism of EF-Tu TufA resistance to pulvomycin is conferred by Arg-231, Arg-334 and Thr-335. This has not been formally proven for tufB, but is certainly correct.Curated

Caution

EF-Tu 1 and EF-Tu 2 differ in a single position and are no longer merged. However, many papers are found in both entries as it is not always possible to determine for each paper which of EF-Tu 1 or EF-Tu 2 was being worked upon.Curated

Keywords - Technical termi

3D-structure, Complete proteome, Direct protein sequencing, Reference proteome

Documents

  1. Escherichia coli
    Escherichia coli (strain K12): entries and cross-references to EcoGene
  2. PDB cross-references
    Index of Protein Data Bank (PDB) cross-references
  3. SIMILARITY comments
    Index of protein domains and families

Similar proteinsi

Links to similar proteins from the UniProt Reference Clusters (UniRef) at 100%, 90% and 50% sequence identity:
100%UniRef100 combines identical sequences and sub-fragments with 11 or more residues from any organism into one UniRef entry.
90%UniRef90 is built by clustering UniRef100 sequences that have at least 90% sequence identity to, and 80% overlap with, the longest sequence (a.k.a seed sequence).
50%UniRef50 is built by clustering UniRef90 seed sequences that have at least 50% sequence identity to, and 80% overlap with, the longest sequence in the cluster.