>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=99.82 E-value=3.5e-20 Score=155.98 Aligned_cols=242 Identities=24% Similarity=0.278 Sum_probs=166.1 Q ss_pred EEEEEECCCCCHHHHHHHHHH-HHHHHCC---------------CCCCEECCCEE----EEECCCCEEEEEECCCHHHHH Q ss_conf 389862368504467778864-2221001---------------23100012149----995178438888516615789 Q gi|254780787|r 385 VVTIMGHVDHGKTSLLDAIRK-ADVAKGE---------------IGGITQHIGAY----QVAYQGKNITFLDTPGHAAFY 444 (884) Q Consensus 385 vv~v~ghvd~GKt~lld~~r~-~~~~~~e---------------~ggitq~iga~----~~~~~~~~~~~iDtPGh~~f~ 444 (884) T Consensus 21 niGi~ahidhGkttlsdnllaGaGmis~elaG~q~~ldfde~e~~rGiti~aanvsmvh~yeG~~ylinlidtPGhvdfG 100 (724) T TIGR00490 21 NIGIVAHIDHGKTTLSDNLLAGAGMISEELAGEQLYLDFDEQEQERGITIDAANVSMVHEYEGNEYLINLIDTPGHVDFG 100 (724) T ss_pred HEEEEEEECCCCCHHHHHHHHCCCHHHHHHCCCCEEECCCHHHHHCCCEEEEEEEEEEEEECCCCEEEEEECCCCCCCCC T ss_conf 00037863177511223444213323454056410002441352377267641156765314750243331488621056 Q ss_pred HHHHHHHHCCCCEEEEEECCCCCCHHHHHHHHHHHHCCCCEEEECCCCCCCCCCCCHHHHHHHC---------------- Q ss_conf 9986664206805999983667402357778989970994156123312443320002210000---------------- Q gi|254780787|r 445 EMRARGARVTDIAVLVLAADEEIMPQAIESINHAKAADVSIIVAINKIDKLGADPQKVRMSLLK---------------- 508 (884) Q Consensus 445 ~~r~rg~~~~d~~ilvv~~~~g~~~qt~e~~~~~~~~~~p~iva~nk~d~~~~~~~~~~~~~~~---------------- 508 (884) T Consensus 101 Gdvtramra~dG~~vvv~aveG~mPqtetvlrqal~e~v~Pvlf~nkvdrli~el~l~~~~lq~r~~k~i~~~n~li~~m 180 (724) T TIGR00490 101 GDVTRAMRAVDGAIVVVCAVEGVMPQTETVLRQALKENVKPVLFINKVDRLINELKLTPEELQERLIKIIAEVNKLIKKM 180 (724) T ss_pred CHHHHHHHHHCCEEEEEEECCCCCCCHHHHHHHHHHHCCCEEEEEHHHHHHHHHHCCCHHHHHHHHHHHHHHHHHHHHHC T ss_conf 24888877647638999502565761578999998731870677234788888624688899999999999999999741 Q ss_pred ----------------CCCCCCCCCCCCEEEEEEECCCCCCCCCCCCHHC------------------------------ Q ss_conf ----------------1320001234740363110024774112210000------------------------------ Q gi|254780787|r 509 ----------------HDVFVESMGGDILDVEISAKNNLNLDKLLDAILL------------------------------ 542 (884) Q Consensus 509 ----------------~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~------------------------------ 542 (884) T Consensus 181 ~P~~~~~~W~~~v~~Gs~afGsa~~nWa~~vP~~~~~Gi~f~~~~~~~~e~~~~ela~k~Pl~~v~l~mv~~hlPsP~e~ 260 (724) T TIGR00490 181 APEEFKDKWKVRVEDGSVAFGSAYYNWAISVPIMKKTGITFKDIYKYIKEDKQKELAKKAPLHQVVLDMVIKHLPSPAEA 260 (724) T ss_pred CCCCHHCCCEEEECCCCCHHHHHHHHHEEECCCCCCCCCCHHHHHHHHHCCHHHHHHHHCCHHHHHHHHHHHHCCCCHHH T ss_conf 76100000047651564101122210002044300137759999998630114557640658899999999744896224 Q ss_pred --------C-------CCCCCCCCCCCCCCCCEEEEEEEECCCCCCHHHHHHCCHHHCCCCC--CCCCCCCCCEECCC-- Q ss_conf --------2-------3333420003486664167778863776200000000000000000--25665554200014-- Q gi|254780787|r 543 --------Q-------AEMLDLKTSINRKAEGIVVEGKLDRGRGPVVTVLVQKGTLSKGNIL--VVGDQWGKIRALFN-- 603 (884) Q Consensus 543 --------~-------~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~g~~~~~~~~--~~~~~~~~v~~~~~-- 603 (884) T Consensus 261 q~~r~~~~W~Gd~~se~G~am~~~dP~GP~a~~~t~~~~~~~aG~~~~~r~y~G~i~~G~e~y~v~~~~k~~~q~v~~ym 340 (724) T TIGR00490 261 QKYRIPVIWKGDLNSEAGKAMLNCDPEGPLAVMITKIVVDKHAGEVAVGRLYSGAIKKGSEVYLVDRKAKARIQQVGVYM 340 (724) T ss_pred HHHHHHHHEECCCCCHHCCHHCCCCCCCCEEEEEEEEEEECCCCCEEEEEEECCEECCCCEEEEECCHHHCCEEEEEEEE T ss_conf 44010010104654000542100489986144556556603668167755531500368668986430002112466776 Q ss_pred -CCCCCCCCCCCCCCCCCCCCCCC Q ss_conf -66532210000122211112347 Q gi|254780787|r 604 -DRGQGISKAVPSMPIEVLGLQGM 626 (884) Q Consensus 604 -~~~~~~~~~~~~~~~~~~~~~~~ 626 (884) T Consensus 341 GP~r~~~d~~~aGni~a~~G~k~a 364 (724) T TIGR00490 341 GPERVEVDEIPAGNIVAVVGLKEA 364 (724) T ss_pred CCEECCCCCCCCCCEEEEEECCCC T ss_conf 670201242267756887403211

HHsearch alignment for GI: 254780787 and conserved domain: TIGR00490