>TIGR00484 EF-G translation elongation factor G; InterPro: IPR004540 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. EF-G is a large, five-domain GTPase that promotes the directional movement of mRNA and tRNAs on the ribosome in a GTP-dependent manner. Unlike other GTPases, but by analogy to the myosin motor, EF-G performs its function of powering translocation in the GDP-bound form; that is, in a kinetically stable ribosome-EF-G(GDP) complex formed by GTP hydrolysis on the ribosome. The complex undergoes an extensive structural rearrangement, in particular affecting the small ribosomal subunit, which leads to mRNA-tRNA movement. Domain 4, which extends from the 'body' of the EF-G molecule much like a lever arm, appears to be essential for the structural transition to take place. In a hypothetical model, GTP hydrolysis induces a conformational change in the G domain of EF-G, which affects the interactions with neighbouring domains within EF-G. The resulting rearrangement of the domains relative to each other generates conformational strain in the ribosome to which EF-G is fixed. Because of structural features of the tRNA-ribosome complex, this conformational strain results in directional tRNA-mRNA movement. The functional parallels between EF-G and motor proteins suggest that EF-G differs from classical G-proteins in that it functions as a force-generating mechanochemical device rather than a conformational switch . Every completed bacterial genome has at least one copy, but some species have additional EF-G-like proteins. The closest homolog to canonical (e.g. Escherichia coli) EF-G in the spirochetes clusters as if it is derived from mitochondrial forms, while a more distant second copy is also present. Synechocystis sp. (strain PCC 6803) has a few proteins more closely related to EF-G than to any other characterised protein. Two of these resemble E. coli EF-G more closely than does the best match from the spirochetes; it may be that both function as authentic EF-G. More information about these proteins can be found at Protein of the Month: Elongation Factors . ; GO: 0003746 translation elongation factor activity, 0005525 GTP binding, 0006414 translational elongation, 0005622 intracellular.

Probab=100.00 E-value=0 Score=849.42 Aligned_cols=457 Identities=30% Similarity=0.483 Sum_probs=411.5 Q ss_pred CCCCCCCCEEEEECCCCCCHHHHHHHHHHHCCCCCCCCCCC--C--EECCCCHHHHHCCCEEEEEEEEEEECC------E Q ss_conf 46802431499985468987788999999839614232200--0--003885779870960646799999899------7 Q gi|254780233|r 13 RLGYMQIRNIAIIAHVDHGKTTLVDELLKQSGVFRDNQRVS--E--RVMDCNDLEKERGITILAKVTSIVWND------V 82 (624) Q Consensus 13 ~~~~~~IRNiaIiaHvDhGKTTL~d~LL~~sG~~~~~~~v~--~--~vmD~~~~EreRGITI~a~~~~~~~~~------~ 82 (624) T Consensus 4 ~~~~~~~RNiGI~AHIDaGKTT~~ERILFy~g~~HkIgE~~g~dG~a~MDwME~E~ERGITItSAAT~~~Wk~~~~~~~~ 83 (705) T TIGR00484 4 TTDLEKLRNIGISAHIDAGKTTTTERILFYTGRIHKIGEVHGKDGAATMDWMEQEKERGITITSAATTVEWKGMAKQYDH 83 (705) T ss_pred CCCHHHCCCCCEEEEECCCCCCCHHEEEECCCCCCCEEECCCCCCCEECCHHHHCCCCCEEEECHHCCHHHHHHHHCCCC T ss_conf 56523305543278633887320101000137501000001678851123123003587142100110102101000140 Q ss_pred EEEEECCCCCCCCHHHHHHHHHHHCEEEEEEECCCCCCHHHHHHHHHHHHCCCCEEEEEECCCCCCCCHHHHHHHHHHHH Q ss_conf 99997289875407999999874217899997687886478999999997299789999754366740256899999888 Q gi|254780233|r 83 RINIVDTPGHADFGGEVERILCMVESVVVLVDAAEGPMPQTKFVVGKALKIGLRPIVVVNKVDRSDARADEVINEVFDLF 162 (624) Q Consensus 83 ~iNiiDTPGH~DF~gEVer~l~~~DgaiLvVdA~eGv~~QT~~vl~~A~~~~l~~IvvINKiDr~~a~~~~v~~ei~dlf 162 (624) T Consensus 84 ~~N~IDTPGHVDFT~EVERSlRVLDGAv~V~~a~~GV~pQ~~TVwRQa~~Y~VPRi~FVNK~Dk~GAnf~~~~~~~~~rL 163 (705) T TIGR00484 84 RINIIDTPGHVDFTVEVERSLRVLDGAVAVLDAVGGVQPQSETVWRQANKYEVPRIVFVNKMDKTGANFLRVVNQLKSRL 163 (705) T ss_pred EEEEEECCCCEEEEEEEEEHHHHHHHHHHHHHHCCCCCCCHHHHHHHHHHCCCCEEEEEECCCCCCCCHHHHHHHHHHHH T ss_conf 37887378941257885201225645665333026866411567765432688628997155645787889999999874 Q ss_pred H-------------------------------------------------------------HC-CCCHHHCC------- Q ss_conf 6-------------------------------------------------------------22-67301104------- Q gi|254780233|r 163 S-------------------------------------------------------------AL-DATDAQLD------- 173 (624) Q Consensus 163 ~-------------------------------------------------------------~l-~a~de~ld------- 173 (624) T Consensus 164 ~~~~~~~qlpiGaE~~f~GviDLv~~ka~~~~~~~~g~~~~~~~iP~~~~~~~~~~~~~l~e~~a~~~~~LM~~yl~G~e 243 (705) T TIGR00484 164 GANAVPIQLPIGAEDKFIGVIDLVEMKAYFFEEGDKGTKIDEKEIPSDLLEQAKELRENLVEAVAELDEELMEKYLEGEE 243 (705) T ss_pred CCCCEEEEECCCCCCCCCEEEEEEEEEEEEECCCCCCCEEHHHCCCHHHHHHHHHHHHHHHHHHHCCCHHHHHHHCCCCC T ss_conf 67734664112566563104554301567750677664001222647899999999999999884200788998508965 Q ss_pred -------------------HHHHHHHHHCCEECCCCCCCCCCCCHHHHHHHHCCCCCCCC-------------------- Q ss_conf -------------------26688788659164674223348641355532102454223-------------------- Q gi|254780233|r 174 -------------------FPILYGSGRFGWMSDSSDGSRDQGMVPLLNLIVDHVPPPVI-------------------- 214 (624) Q Consensus 174 -------------------~Pv~~~Sa~~G~~~~~~~~~~~~gl~~Lld~Ii~~iP~P~~-------------------- 214 (624) T Consensus 244 ~~~~~ik~~~r~g~l~~~~~pv~~GSaf-----------KNKGv~~lLDAV~~yLP~P~dv~~~~~~~~~~~~~e~~~~~ 312 (705) T TIGR00484 244 LTIEEIKNAIRKGVLNLELIPVLCGSAF-----------KNKGVQLLLDAVVDYLPSPTDVPAIKGIDPDTNEEEIELKA 312 (705) T ss_pred CCHHHHHHHHHCCEEEEEEEEEEECCCC-----------HHHHHHHHHHHHHHHCCCCCCHHHHHCCCCCCCCCCEEEEE T ss_conf 3689998887513112468888750330-----------00258889999997478974315430235566776136751 Q ss_pred -CCCHHHCCCCCCCCCCCCCEEEEEEECCCCCCCCCEEEEECCCCCCEEECCCCCEEEECCCCCCCCCCCCCCCCCCCCC Q ss_conf -3200000111101367773499999607805159889996057850121145530110366534441125455432222 Q gi|254780233|r 215 -SEGEFKMIGTILEKDPFLGRIVTGRIHSGTIKSNQNIKALSPDGALVEVGRVSKILAFRGIDRQPIDEAHAGDIVSIAG 293 (624) Q Consensus 215 -~e~pl~~~V~~i~~d~y~Gria~gRV~sGtlk~Gd~V~vl~~~g~~~~~~kV~~L~~~~G~~r~~v~ea~AGDIvaIaG 293 (624) T Consensus 313 sd~~~f~~LAFK~~tdpfvG~LTf~RvY~G~l~~G~~v~Ns~----~~k~ervgRl~~MHa~~re~I~~~~aGdI~A~~G 388 (705) T TIGR00484 313 SDEEPFVALAFKVATDPFVGQLTFVRVYSGVLKSGSYVKNSR----KSKKERVGRLVKMHANKREEIKEVRAGDIAAAIG 388 (705) T ss_pred CCCCCCEEEEEEECCCCCCCEEEEEEEEEEEECCCCEEEECH----HHHHHHHHHHHHCCCCCCCCCCCCCCCCEEEEEC T ss_conf 567651223456405873112789999761512797776020----0001443233310037721001213563688731 Q ss_pred CCCCCCCCEECCCCCCCCCCCCCCCCCCEEEEEECCCCCCCCCCCCCHHHHHHHHHHHHHHCCCCEEEEEECCCCCEEEE Q ss_conf 33210122110556521123366665421578612686554444321017889999999730283799998599975999 Q gi|254780233|r 294 LVKATVADTFCDPSIDEPLKAQPIDPPTVTMTFGVNDSPLAGTEGDKVTSRMIRDRLFKEAEGNIALKIEESSSKDAFFV 373 (624) Q Consensus 294 l~~~~iGDTL~~~~~p~~Lp~i~i~~Ptis~~f~vn~sP~ag~eg~~~ts~~l~~rL~ke~~~dvsL~ve~~~~~~~~~v 373 (624) T Consensus 389 lkd~~TGdTl~d~~~~~~le~M~fp~PVI~~avePK~----Kad~-----~kM~~AL~~la~EDP~F~~~~~~E~g~TiI 459 (705) T TIGR00484 389 LKDTTTGDTLCDEKADVILESMEFPEPVISLAVEPKT----KADQ-----EKMGIALGKLAEEDPTFRTFTDEETGQTII 459 (705) T ss_pred CEECCCCCCCCCCCCCCEEEECCCCCCEEEEEECCCC----CCCH-----HHHHHHHHHHHCCCCCEEEEECCCCCCHHH T ss_conf 3002567632256420001002588871688755887----4355-----679999875322488604775274444132 Q ss_pred EECCHHHHHHHHHHHHHC-CEEEECCCCEEEEEEE--------------------------------------------- Q ss_conf 963645688887412334-8033015744899820--------------------------------------------- Q gi|254780233|r 374 SGRGELQLAVLIETMRRE-GFELAVSRPRVVIKKE--------------------------------------------- 407 (624) Q Consensus 374 ~GrGeLHL~IliE~mRRE-G~E~~vs~P~V~~k~~--------------------------------------------- 407 (624) T Consensus 460 ~GMGELHL~i~vdRmkREFkvE~~~G~PQVayRET~~~~~~~~e~k~~kQSGGrGQyG~V~i~~~P~~~~~~~~gyEF~n 539 (705) T TIGR00484 460 AGMGELHLDIIVDRMKREFKVEANVGAPQVAYRETIRSKAEDVEGKYAKQSGGRGQYGHVVIELEPLEPEEGGKGYEFVN 539 (705) T ss_pred HCCCHHHHHHHHHHHCCEEEEEEECCCCCCHHHHHHHHHHHHHCCEEEECCCCCCCCEEEEEEEECCCCCCCCCCCEEEE T ss_conf 03104567788665210033433058683034554311123213503230689873016899861277788876422533 Q ss_pred ----------------------------------------------------------------------CCEECCEEEE Q ss_conf ----------------------------------------------------------------------8826041688 Q gi|254780233|r 408 ----------------------------------------------------------------------GDSLLEPIEE 417 (624) Q Consensus 408 ----------------------------------------------------------------------dg~~lEPie~ 417 (624) T Consensus 540 ~I~GGviP~EYIp~v~~G~~~a~~~G~LaGyP~vD~k~~l~dG~yH~VDSse~AFk~Aas~A~k~a~~~a~PvlLEPiMk 619 (705) T TIGR00484 540 EIKGGVIPREYIPAVDKGLQEALESGPLAGYPVVDIKVTLFDGSYHDVDSSELAFKLAASLAFKEAVKKANPVLLEPIMK 619 (705) T ss_pred CCCCCCCCCCCHHHHHHHHHHHHHCCCEECCCEEEEEEEEECCCCCCCCHHHHHHHHHHHHHHHHHHHHCCCEEECCCEE T ss_conf 03486077321036777799998469732143476478885175231162789999999999998676359745446027 Q ss_pred EEEECCHHHHHHHHHHHHHCCCEECCCCCCCCCEEEEEEEECHHHHHHHHHHHHHHCCCCEEEEEEEECCCCCCCCC Q ss_conf 88731323310789988743540104213689849999996133565688998853276167888870530135787 Q gi|254780233|r 418 VVIDVDEEHSGAVVQKMTLHKSEMIELRPSGTGRVRLVFLSPTRGLIGYQSQLMTDTRGTAIMNRLFHSYQPHKGEI 494 (624) Q Consensus 418 v~I~vp~ey~G~Vi~~l~~RrG~i~~m~~~~~g~~~l~~~vP~r~l~g~~~~l~s~T~G~g~~~~~f~~Y~p~~g~i 494 (624) T Consensus 620 vev~~P~ey~Gd~~Gdl~~RRg~~~g~~~~~~-~~~v~A~VPL~EMFGyaT~LRS~tqGr~~y~M~~~~Y~e~P~~v 695 (705) T TIGR00484 620 VEVEVPEEYMGDVIGDLSRRRGIIEGSEERGN-VQVVKAEVPLSEMFGYATDLRSSTQGRGEYSMEFLHYGEVPSSV 695 (705) T ss_pred EEEECCCCCCCCHHCCCCCCCCEEEEEECCCC-EEEEEEEECCHHHCCHHHHHHCCCCCCEEEEEEHHHHCCCHHHH T ss_conf 88755852015100010003511420002373-56899850603222303233205677226886323321232789

HHsearch alignment for GI: 254780233 and conserved domain: TIGR00484