>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=868.63 Aligned_cols=469 Identities=30% Similarity=0.488 Sum_probs=423.5 Q ss_pred CCCHHHCEEEEEECCCCCCHHHHHHHHHHHCCCCCCC---C--CCCEEECCCHHHHHHCCEEEEEEEEEEEEC--CCCCE Q ss_conf 9985253179998013898778899999982980544---4--431130586779871950523279999743--78843 Q gi|254780321|r 5 PTPLSRIRNFSIVAHIDHGKSTLADRFIQHCRGLTER---E--MSSQVLDNMDIERERGITIKAQTVRLNYTS--TDAKD 77 (606) Q Consensus 5 ~~p~~~IRN~~IiaHvDhGKTTL~d~lL~~tg~i~~~---~--~~~~vlD~~~~EreRGITIka~~~~~~~~~--~~~~~ 77 (606) T Consensus 4 ~~~~~~~RNiGI~AHIDaGKTT~~ERILFy~g~~HkIgE~~g~dG~a~MDwME~E~ERGITItSAAT~~~Wk~~~~~~-~ 82 (705) T TIGR00484 4 TTDLEKLRNIGISAHIDAGKTTTTERILFYTGRIHKIGEVHGKDGAATMDWMEQEKERGITITSAATTVEWKGMAKQY-D 82 (705) T ss_pred CCCHHHCCCCCEEEEECCCCCCCHHEEEECCCCCCCEEECCCCCCCEECCHHHHCCCCCEEEECHHCCHHHHHHHHCC-C T ss_conf 565233055432786338873201010001375010000016788511231230035871421001101021010001-4 Q ss_pred EEEEEEECCCCCHHHHHHHHHHHHCCEEEEEEECCCCCCHHHHHHHHHHHHCCCCEEEEECCCCCCCCCCCCHHHHHHHH Q ss_conf 89999617873002799999997302689999868788655899999999709967998326788753211338887755 Q gi|254780321|r 78 YQLNLIDTPGHVDFTYEVSRSLSACEGSLLVVDATQGVEAQTLANVYQAIDNNHEIITVLNKADLPSADPDRVKKQIEET 157 (606) Q Consensus 78 y~iNlIDTPGH~DF~~EV~r~l~a~dgaiLvVdA~~Gvq~QT~~~~~~A~~~~l~~I~viNKiD~~~A~~e~v~~ei~~~ 157 (606) T Consensus 83 ~~~N~IDTPGHVDFT~EVERSlRVLDGAv~V~~a~~GV~pQ~~TVwRQa~~Y~VPRi~FVNK~Dk~GAnf~~~~~~~~~r 162 (705) T TIGR00484 83 HRINIIDTPGHVDFTVEVERSLRVLDGAVAVLDAVGGVQPQSETVWRQANKYEVPRIVFVNKMDKTGANFLRVVNQLKSR 162 (705) T ss_pred CEEEEEECCCCEEEEEEEEEHHHHHHHHHHHHHHCCCCCCCHHHHHHHHHHCCCCEEEEEECCCCCCCCHHHHHHHHHHH T ss_conf 03788737894125788520122564566533302686641156776543268862899715564578788999999987 Q ss_pred HHHHH---------------------------------------------------------------H----------- Q ss_conf 53223---------------------------------------------------------------2----------- Q gi|254780321|r 158 IGIST---------------------------------------------------------------E----------- 163 (606) Q Consensus 158 ~g~~~---------------------------------------------------------------~----------- 163 (606) T Consensus 163 L~~~~~~~qlpiGaE~~f~GviDLv~~ka~~~~~~~~g~~~~~~~iP~~~~~~~~~~~~~l~e~~a~~~~~LM~~yl~G~ 242 (705) T TIGR00484 163 LGANAVPIQLPIGAEDKFIGVIDLVEMKAYFFEEGDKGTKIDEKEIPSDLLEQAKELRENLVEAVAELDEELMEKYLEGE 242 (705) T ss_pred HCCCCEEEEECCCCCCCCCEEEEEEEEEEEEECCCCCCCEEHHHCCCHHHHHHHHHHHHHHHHHHHCCCHHHHHHHCCCC T ss_conf 46773466411256656310455430156775067766400122264789999999999999988420078899850896 Q ss_pred ---------------------HHHHHHHHCCCCCCHHHHHHHHHHHCCCCH------------------HHHHCCCCCCC Q ss_conf ---------------------100011100223200678776321000111------------------12201233101 Q gi|254780321|r 164 ---------------------DALLVSAKTGEGIPLLLERIVQQLPSPTSP------------------EGANAPLKALL 204 (606) Q Consensus 164 ---------------------~ii~vSAktG~GV~~LLd~Iv~~iP~P~~~------------------~~~~~Pl~alV 204 (606) T Consensus 243 e~~~~~ik~~~r~g~l~~~~~pv~~GSafKNKGv~~lLDAV~~yLP~P~dv~~~~~~~~~~~~~e~~~~~sd~~~f~~LA 322 (705) T TIGR00484 243 ELTIEEIKNAIRKGVLNLELIPVLCGSAFKNKGVQLLLDAVVDYLPSPTDVPAIKGIDPDTNEEEIELKASDEEPFVALA 322 (705) T ss_pred CCCHHHHHHHHHCCEEEEEEEEEEECCCCHHHHHHHHHHHHHHHCCCCCCHHHHHCCCCCCCCCCEEEEECCCCCCEEEE T ss_conf 53689998887513112468888750330002588899999974789743154302355667761367515676512234 Q ss_pred CCEEECCCCCEEEEEEECCCCCCCCCEEEEECCCCCCCCCCCCCCCCC-EEEEHHCCCCCHHHHHHCCCCCCCCCCCCEE Q ss_conf 210114757259999816987355845887335564210122233554-1240101247123322011002444454200 Q gi|254780321|r 205 IDSWYNSYLGVMVLVRIINGQLTKGQSIRLMGTNAKYQVERIGILTPK-MIDIEALYPGEIGVMIASIKEVSHTRVGDTI 283 (606) Q Consensus 205 fds~~D~~~G~I~~~RV~sG~lk~Gd~I~~~~~g~~~~v~~ig~~~~~-~~~v~~l~aGdVG~ii~gik~l~~~~vGDTl 283 (606) T Consensus 323 FK~~tdpfvG~LTf~RvY~G~l~~G~~v~Ns~~~k~ervgRl~~MHa~~re~I~~~~aGdI~A~~----Glkd~~TGdTl 398 (705) T TIGR00484 323 FKVATDPFVGQLTFVRVYSGVLKSGSYVKNSRKSKKERVGRLVKMHANKREEIKEVRAGDIAAAI----GLKDTTTGDTL 398 (705) T ss_pred EEECCCCCCCEEEEEEEEEEEECCCCEEEECHHHHHHHHHHHHHCCCCCCCCCCCCCCCCEEEEE----CCEECCCCCCC T ss_conf 56405873112789999761512797776020000144323331003772100121356368873----13002567632 Q ss_pred CCCCCCCCCCCCCCCCCCCEEEEEECCCCHHHHHHHHHHHHHHHHHCCCCCC--CCCCCCCCCCEEEEEECCHHHHHHHH Q ss_conf 0466785323645522221266421267702457889999888641122111--25676000420289963767898889 Q gi|254780321|r 284 TDDSSPTTSALPGFKPIQPVVFCGLFPVDATQFENLRTAINKLRLNDASFSF--ELENSTALGFGFRCGFLGLLHLEIIQ 361 (606) Q Consensus 284 ~~~~~p~~~~Lp~~~~~~P~v~~~i~p~~~~d~~~L~~aL~kL~~~D~sl~~--e~Ets~aLg~Gfr~gglG~LHLeVi~ 361 (606) T Consensus 399 ~d~~~~~~--le~M~fp~PVI~~avePK~Kad~~kM~~AL~~la~EDP~F~~~~~~E~g~Ti-----I~GMGELHL~i~v 471 (705) T TIGR00484 399 CDEKADVI--LESMEFPEPVISLAVEPKTKADQEKMGIALGKLAEEDPTFRTFTDEETGQTI-----IAGMGELHLDIIV 471 (705) T ss_pred CCCCCCCE--EEECCCCCCEEEEEECCCCCCCHHHHHHHHHHHHCCCCCEEEEECCCCCCHH-----HHCCCHHHHHHHH T ss_conf 25642000--1002588871688755887435567999987532248860477527444413-----2031045677886 Q ss_pred HHHHHHCCCEEEEECCCCCEE----------------------------------------------------------- Q ss_conf 888664495069737823303----------------------------------------------------------- Q gi|254780321|r 362 ERLEREFSLNLIGTSPSVVYE----------------------------------------------------------- 382 (606) Q Consensus 362 eRL~rEfg~ev~~t~P~V~Yk----------------------------------------------------------- 382 (606) T Consensus 472 dRmkREFkvE~~~G~PQVayRET~~~~~~~~e~k~~kQSGGrGQyG~V~i~~~P~~~~~~~~gyEF~n~I~GGviP~EYI 551 (705) T TIGR00484 472 DRMKREFKVEANVGAPQVAYRETIRSKAEDVEGKYAKQSGGRGQYGHVVIELEPLEPEEGGKGYEFVNEIKGGVIPREYI 551 (705) T ss_pred HHHCCEEEEEEECCCCCCHHHHHHHHHHHHHCCEEEECCCCCCCCEEEEEEEECCCCCCCCCCCEEEECCCCCCCCCCCH T ss_conf 65210033433058683034554311123213503230689873016899861277788876422533034860773210 Q ss_pred -------------------------EEEECCCEEECCCHHHCCCH--HHHH----------HHHCCEEEEEEEECCCCCH Q ss_conf -------------------------35315645412696662586--7788----------8623269999980831000 Q gi|254780321|r 383 -------------------------LYMHDGSMQKLSNPIDMPEV--TKIA----------ELREPWIQVTIITPNEYLG 425 (606) Q Consensus 383 -------------------------v~~~dG~~~~Vd~p~~~p~~--~~i~----------~i~EPi~~~~I~~P~ey~G 425 (606) T Consensus 552 p~v~~G~~~a~~~G~LaGyP~vD~k~~l~dG~yH~VDS-se~AFk~Aas~A~k~a~~~a~PvlLEPiMkvev~~P~ey~G 630 (705) T TIGR00484 552 PAVDKGLQEALESGPLAGYPVVDIKVTLFDGSYHDVDS-SELAFKLAASLAFKEAVKKANPVLLEPIMKVEVEVPEEYMG 630 (705) T ss_pred HHHHHHHHHHHHCCCEECCCEEEEEEEEECCCCCCCCH-HHHHHHHHHHHHHHHHHHHCCCEEECCCEEEEEECCCCCCC T ss_conf 36777799998469732143476478885175231162-78999999999999867635974544602788755852015 Q ss_pred HHHHHHHHHHHEEECCCCCCCEEEEEEEECHHHHHHHHHHHHHHHCCCEEEEEEEECCCEEC Q ss_conf 38999886300142443368369999996043332204687676357418889854354643 Q gi|254780321|r 426 SILKLCQERRGIQIDMSHLDNRAMIVYELPLNEVIFDFYDRLKSVSKGYASFDYNVIDYRDS 487 (606) Q Consensus 426 ~Vm~~l~~RRG~~~~m~~~~~~~~i~~~vPl~Eli~~f~~~LkS~T~G~as~~ye~~~Y~~~ 487 (606) T Consensus 631 d~~Gdl~~RRg~~~g~~~~~~~~~v~A~VPL~EM-FGyaT~LRS~tqGr~~y~M~~~~Y~e~ 691 (705) T TIGR00484 631 DVIGDLSRRRGIIEGSEERGNVQVVKAEVPLSEM-FGYATDLRSSTQGRGEYSMEFLHYGEV 691 (705) T ss_pred CHHCCCCCCCCEEEEEECCCCEEEEEEEECCHHH-CCHHHHHHCCCCCCEEEEEEHHHHCCC T ss_conf 1000100035114200023735689985060322-230323320567722688632332123

HHsearch alignment for GI: 254780321 and conserved domain: TIGR00484