>TIGR00490 aEF-2 translation elongation factor aEF-2; InterPro: IPR004543 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 EF2 (EF-G) is a G-protein. It brings about the translocation of peptidyl-tRNA and mRNA through a ratchet-like mechanism: the binding of GTP-EF2 to the ribosome causes a counter-clockwise rotation in the small ribosomal subunit; the hydrolysis of GTP to GDP by EF2 and the subsequent release of EF2 causes a clockwise rotation of the small subunit back to the starting position , . This twisting action destabilises tRNA-ribosome interactions, freeing the tRNA to translocate along the ribosome upon GTP-hydrolysis by EF2. EF2 binding also affects the entry and exit channel openings for the mRNA, widening it when bound to enable the mRNA to translocate along the ribosome. This entry represents archaeal EF2 proteins (also known as aEF2), which are more similar to eukaryotic EF2 than to bacterial EF2 (or EFG), both in sequence similarity and in sharing with eukaryotes the property of having a diphthamide (modified His) residue at a conserved position. The diphthamide can be ADP-ribosylated by diphtheria toxin in the presence of NAD. 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, 0005737 cytoplasm.

Probab=100.00 E-value=0 Score=592.98 Aligned_cols=466 Identities=27% Similarity=0.464 Sum_probs=393.9 Q ss_pred HHHCEEEEEECCCCCCHHHHHHHHHHHCCCCCCCCCCC-EEECCCHHHHHHCCEEEEEEEEEEEECCCCCEEEEEEEECC Q ss_conf 52531799980138987788999999829805444431-13058677987195052327999974378843899996178 Q gi|254780321|r 8 LSRIRNFSIVAHIDHGKSTLADRFIQHCRGLTEREMSS-QVLDNMDIERERGITIKAQTVRLNYTSTDAKDYQLNLIDTP 86 (606) Q Consensus 8 ~~~IRN~~IiaHvDhGKTTL~d~lL~~tg~i~~~~~~~-~vlD~~~~EreRGITIka~~~~~~~~~~~~~~y~iNlIDTP 86 (606) T Consensus 16 ~~~irniGi~ahidhGkttlsdnllaGaGmis~elaG~q~~ldfde~e~~rGiti~aanvsmvh~-yeG~~ylinlidtP 94 (724) T TIGR00490 16 PEFIRNIGIVAHIDHGKTTLSDNLLAGAGMISEELAGEQLYLDFDEQEQERGITIDAANVSMVHE-YEGNEYLINLIDTP 94 (724) T ss_pred HHHHHHEEEEEEECCCCCHHHHHHHHCCCHHHHHHCCCCEEECCCHHHHHCCCEEEEEEEEEEEE-ECCCCEEEEEECCC T ss_conf 12221000378631775112234442133234540564100024413523772676411567653-14750243331488 Q ss_pred CCCHHHHHHHHHHHHCCEEEEEEECCCCCCHHHHHHHHHHHHCCCCEEEEECCCCCCCCCCCCHHHHHH----------- Q ss_conf 730027999999973026899998687886558999999997099679983267887532113388877----------- Q gi|254780321|r 87 GHVDFTYEVSRSLSACEGSLLVVDATQGVEAQTLANVYQAIDNNHEIITVLNKADLPSADPDRVKKQIE----------- 155 (606) Q Consensus 87 GH~DF~~EV~r~l~a~dgaiLvVdA~~Gvq~QT~~~~~~A~~~~l~~I~viNKiD~~~A~~e~v~~ei~----------- 155 (606) T Consensus 95 GhvdfGGdvtramra~dG~~vvv~aveG~mPqtetvlrqal~e~v~Pvlf~nkvdrli~el~l~~~~lq~r~~k~i~~~n 174 (724) T TIGR00490 95 GHVDFGGDVTRAMRAVDGAIVVVCAVEGVMPQTETVLRQALKENVKPVLFINKVDRLINELKLTPEELQERLIKIIAEVN 174 (724) T ss_pred CCCCCCCHHHHHHHHHCCEEEEEEECCCCCCCHHHHHHHHHHHCCCEEEEEHHHHHHHHHHCCCHHHHHHHHHHHHHHHH T ss_conf 62105624888877647638999502565761578999998731870677234788888624688899999999999999 Q ss_pred HHH-HHHHH-------------HHHHHHH------------HCCCCC----------------------CHHHHHHHHHH Q ss_conf 555-32232-------------1000111------------002232----------------------00678776321 Q gi|254780321|r 156 ETI-GISTE-------------DALLVSA------------KTGEGI----------------------PLLLERIVQQL 187 (606) Q Consensus 156 ~~~-g~~~~-------------~ii~vSA------------ktG~GV----------------------~~LLd~Iv~~i 187 (606) T Consensus 175 ~li~~m~P~~~~~~W~~~v~~Gs~afGsa~~nWa~~vP~~~~~Gi~f~~~~~~~~e~~~~ela~k~Pl~~v~l~mv~~hl 254 (724) T TIGR00490 175 KLIKKMAPEEFKDKWKVRVEDGSVAFGSAYYNWAISVPIMKKTGITFKDIYKYIKEDKQKELAKKAPLHQVVLDMVIKHL 254 (724) T ss_pred HHHHHCCCCCHHCCCEEEECCCCCHHHHHHHHHEEECCCCCCCCCCHHHHHHHHHCCHHHHHHHHCCHHHHHHHHHHHHC T ss_conf 99974176100000047651564101122210002044300137759999998630114557640658899999999744 Q ss_pred HCCCCH-----------------------HHHHCCCCCCCCCEEECCCCCEEEEEEECCCCCCCCCEEEEECCCCCCCCC Q ss_conf 000111-----------------------122012331012101147572599998169873558458873355642101 Q gi|254780321|r 188 PSPTSP-----------------------EGANAPLKALLIDSWYNSYLGVMVLVRIINGQLTKGQSIRLMGTNAKYQVE 244 (606) Q Consensus 188 P~P~~~-----------------------~~~~~Pl~alVfds~~D~~~G~I~~~RV~sG~lk~Gd~I~~~~~g~~~~v~ 244 (606) T Consensus 255 PsP~e~q~~r~~~~W~Gd~~se~G~am~~~dP~GP~a~~~t~~~~~~~aG~~~~~r~y~G~i~~G~e~y~v~~~~k~~~q 334 (724) T TIGR00490 255 PSPAEAQKYRIPVIWKGDLNSEAGKAMLNCDPEGPLAVMITKIVVDKHAGEVAVGRLYSGAIKKGSEVYLVDRKAKARIQ 334 (724) T ss_pred CCCHHHHHHHHHHHEECCCCCHHCCHHCCCCCCCCEEEEEEEEEEECCCCCEEEEEEECCEECCCCEEEEECCHHHCCEE T ss_conf 89622444010010104654000542100489986144556556603668167755531500368668986430002112 Q ss_pred CCCC-CCCCEEEEHHCCCCCHHHHHHCCCCCCCCCCCCEECCCCCCCCCCCCCCC-CCCCEEEEEECCCCHHHHHHHHHH Q ss_conf 2223-35541240101247123322011002444454200046678532364552-222126642126770245788999 Q gi|254780321|r 245 RIGI-LTPKMIDIEALYPGEIGVMIASIKEVSHTRVGDTITDDSSPTTSALPGFK-PIQPVVFCGLFPVDATQFENLRTA 322 (606) Q Consensus 245 ~ig~-~~~~~~~v~~l~aGdVG~ii~gik~l~~~~vGDTl~~~~~p~~~~Lp~~~-~~~P~v~~~i~p~~~~d~~~L~~a 322 (606) T Consensus 335 ~v~~ymGP~r~~~d~~~aGni~a----~~G~k~a~aG~t~C~~~~~-~~~fe~~~h~sePv~t~a~eakn~~dlPkliev 409 (724) T TIGR00490 335 QVGVYMGPERVEVDEIPAGNIVA----VVGLKEAVAGETICSTDKK-IKPFEAIKHISEPVVTVAIEAKNTKDLPKLIEV 409 (724) T ss_pred EEEEEECCEECCCCCCCCCCEEE----EEECCCCCCCCCCCCCHHH-HHHHHHHHHCCCCEEEEEEECCCCCCCHHHHHH T ss_conf 46677667020124226775688----7403211145300252123-213343232047537999714675440589999 Q ss_pred HHHHHHHCCCCCCC--CCCCCCCCCEEEEEECCHHHHHHHHHHHHHH-CCCEEEEECCCCCEEEEEECCCEEECC--CHH Q ss_conf 98886411221112--5676000420289963767898889888664-495069737823303353156454126--966 Q gi|254780321|r 323 INKLRLNDASFSFE--LENSTALGFGFRCGFLGLLHLEIIQERLERE-FSLNLIGTSPSVVYELYMHDGSMQKLS--NPI 397 (606) Q Consensus 323 L~kL~~~D~sl~~e--~Ets~aLg~Gfr~gglG~LHLeVi~eRL~rE-fg~ev~~t~P~V~Ykv~~~dG~~~~Vd--~p~ 397 (606) T Consensus 410 lr~~~~edPt~~~~~neetGehl-----~sGmGelh~e~~~~~~~~~~~~~~~~~~~Pivv~retv~G~~-~~ve~ksPn 483 (724) T TIGR00490 410 LRQVAKEDPTVKVEINEETGEHL-----ISGMGELHLEIIVKKIREKDAGVEVETSEPIVVYRETVTGTS-PVVEGKSPN 483 (724) T ss_pred HHHHHCCCCEEEEEEECCCCCHH-----HHCCCHHHHHHHHHHHHHHHCCCEEEECCCEEEEECCCCCCC-CCCCCCCCC T ss_conf 99741349727999704445123-----312222334556656644112303764485689710104766-632577872 Q ss_pred -------------------------------------------------------------------------------- Q ss_conf -------------------------------------------------------------------------------- Q gi|254780321|r 398 -------------------------------------------------------------------------------- 397 (606) Q Consensus 398 -------------------------------------------------------------------------------- 397 (606) T Consensus 484 khn~~y~~~eP~~~~v~q~~~eG~~~~~~~~~k~~~~~~~~l~~aG~~~eea~~~~~~ye~n~~~~~t~Gi~~l~e~~el 563 (724) T TIGR00490 484 KHNRFYIVVEPLEESVLQAFKEGKIKDVKVKKKLDDEIAKELIEAGLDKEEAKRVEEVYEGNLFINVTRGIQYLDEVKEL 563 (724) T ss_pred CCCEEEEEEECCHHHHHHHHHCCCCEEHHHHHHHHHHHHHHHHHCCCCHHHHHHHHHHHCCCEEEEHHHHHHHHHHHHHH T ss_conf 21547899806337999886358500013444567899999987278867888999874053134224557889999999 Q ss_pred -----------------------------------------HC-CCH-HHH--------HHHHCCEEEEEEEECCCCCHH Q ss_conf -----------------------------------------62-586-778--------886232699999808310003 Q gi|254780321|r 398 -----------------------------------------DM-PEV-TKI--------AELREPWIQVTIITPNEYLGS 426 (606) Q Consensus 398 -----------------------------------------~~-p~~-~~i--------~~i~EPi~~~~I~~P~ey~G~ 426 (606) T Consensus 564 ~~~Gf~~am~~GP~a~e~~~G~k~kl~d~~~heda~hrGPaq~~Pa~r~~i~~a~~~a~P~lleP~q~~~i~~Pqd~mG~ 643 (724) T TIGR00490 564 ILEGFKEAMRNGPVAKEKVMGVKVKLVDAKLHEDAVHRGPAQVIPAVRKGIFAAMLQAEPVLLEPIQKVFINVPQDFMGA 643 (724) T ss_pred HHHHHHHHHHCCCCCCCCCCEEEEEEEEEEECHHHHCCCCHHHHHHHHHHHHHHHHHCCCCHHCCCEEEEEECCHHHHHH T ss_conf 99989999742884210334058998631100223124702565888999999885058502132100134155145567 Q ss_pred HHHHHHHHHHEEECCCCCCCEEEEEEEECHHHHHHHHHHHHHHHCCCEEEEEEEECCCEE Q ss_conf 899988630014244336836999999604333220468767635741888985435464 Q gi|254780321|r 427 ILKLCQERRGIQIDMSHLDNRAMIVYELPLNEVIFDFYDRLKSVSKGYASFDYNVIDYRD 486 (606) Q Consensus 427 Vm~~l~~RRG~~~~m~~~~~~~~i~~~vPl~Eli~~f~~~LkS~T~G~as~~ye~~~Y~~ 486 (606) T Consensus 644 ~~rei~~rrGqi~~m~~eGdm~~~~~~~Pv~em-fGfaG~ir~at~G~~~Ws~e~aG~e~ 702 (724) T TIGR00490 644 ATREIQNRRGQILEMKQEGDMVTIKAKVPVAEM-FGFAGAIRGATEGRCLWSTEFAGFEK 702 (724) T ss_pred HHHHHHCCCCCEEEEECCCCEEEEEECCCHHHH-HCCCCCCCCCCCCCEEEEECCCCHHH T ss_conf 887651257517764047857999724775774-02100101235772466411011453

HHsearch alignment for GI: 254780321 and conserved domain: TIGR00490