>cd04170 EF-G_bact Elongation factor G (EF-G) subfamily. Translocation is mediated by EF-G (also called translocase). The structure of EF-G closely resembles that of the complex between EF-Tu and tRNA. This is an example of molecular mimicry; a protein domain evolved so that it mimics the shape of a tRNA molecule. EF-G in the GTP form binds to the ribosome, primarily through the interaction of its EF-Tu-like domain with the 50S subunit. The binding of EF-G to the ribosome in this manner stimulates the GTPase activity of EF-G. On GTP hydrolysis, EF-G undergoes a conformational change that forces its arm deeper into the A site on the 30S subunit. To accommodate this domain, the peptidyl-tRNA in the A site moves to the P site, carrying the mRNA and the deacylated tRNA with it. The ribosome may be prepared for these rearrangements by the initial binding of EF-G as well. The dissociation of EF-G leaves the ribosome ready to accept the next aminoacyl-tRNA into the A site. This group

Probab=99.69 E-value=3.1e-16 Score=124.91 Aligned_cols=182 Identities=20% Similarity=0.275 Sum_probs=112.3 Q ss_pred EEEEECCCCCCHHHHHHHHHCC-----CEEEECC------C------CCCEEEEEEEEEEECCEEEEEEECCCCHHHCCC Q ss_conf 8998338998688999998689-----2021058------8------886021278999739948999987984010123 Q gi|254780941|r 24 CVALVGATNAGKSTLVNRFVGA-----KVSIVTH------K------VQTTRSIVRGIVSEKESQIVFLDTPGIFNAKDS 86 (311) Q Consensus 24 ~VaivG~pN~GKSTL~N~l~g~-----~vsivS~------k------~~TTr~~i~gi~~~~~~qiifvDTPG~~~~~~~ 86 (311) T Consensus 1 Ni~iigH~~aGKTtL~E~lL~~~g~i~~~G~V~~g~t~~D~~~~E~~RgiSi~s~~~~~~w~~~~inliDTPG~~D---- 76 (268) T cd04170 1 NIALVGHSGSGKTTLAEALLYATGAIDRLGSVEDGTTVSDYDPEEIKRKMSISTSVAPLEWKGHKINLIDTPGYAD---- 76 (268) T ss_pred CEEEEECCCCCHHHHHHHHHHHCCCCCCCCCCCCCCCCCCCCHHHHHCCCCEECCEEEEEECCEEEEEEECCCCHH---- T ss_conf 9899908999989999999996699665765458973577878898679675135578888997999986989757---- Q ss_pred CCCCCCCHHHHHHHHHHHHCCCCHHHHHHHCCHHHHHHHHHHCCCCCEEEEEECCCHHHHHHHHHHHHHHHCCCCCCCCC Q ss_conf 57532100234555532100110000100000001223454428720257872110104345788886410012334311 Q gi|254780941|r 87 YHKLMIRLSWSTIKHADIVCLVVDSHRELKVNIHDLLKEIAKRSSRLILILNKIDCVKPERLLEQAEIANKLVFIEKTFM 166 (311) Q Consensus 87 l~~~~~~~~~~~l~~aDiil~VvDa~~~~~~~~~~il~~l~~~~~p~IiVlNKiDlv~~~~l~~~~~~~~~~~~~~~i~~ 166 (311) T Consensus 77 ----F~~e~~~aL~v~D~Av~Vida~~GVe~~T~~~w~~~~~~~iP~i~fINKmDr~~ad-~~~~l~~i~~~lg~-~~vp 150 (268) T cd04170 77 ----FVGETRAALRAADAALVVVSAQSGVEVGTEKLWEFADEAGIPRIIFINKMDRERAD-FDKTLAALQEAFGR-PVVP 150 (268) T ss_pred ----HHHHHHHHHCCCCEEEEEECCCCCHHHHHHHHHHHHHHCCCCEEEEEECCCCCCCC-HHHHHHHHHHHHCC-CEEE T ss_conf ----99999998404783999941875476879999999998599989999787878996-47799999998689-8499 Q ss_pred CC--CCCCCCHHHHHHHHHHHCCCCCCCCCCCC---CCCCHHHHH-HHHHHHHHHHHHH Q ss_conf 00--01387426789999983662235689643---343025678-9987599999973 Q gi|254780941|r 167 VS--ATKGHGCDDVLNYLCSTLPLAPWVYSADQ---ISDLPMFHF-TAEITREKLFLHL 219 (311) Q Consensus 167 IS--Ak~g~Gid~L~~~L~~~lpe~~~~y~~~~---~Td~~~~~~-i~EiIREki~~~l 219 (311) T Consensus 151 ~~~Pig~g~~f~GvvDl~----~~~a~~~~~~~~~~~~~ip~~~~~~~~~~r~~L~E~v 205 (268) T cd04170 151 LQLPIGEGDDFKGVVDLL----TEKAYIYSPGAPSEEIEIPEELKEEVAEAREELLEAV 205 (268) T ss_pred EEEEECCCCCCEEEEECC----CCEEEEECCCCCCEECCCCHHHHHHHHHHHHHHHHHH T ss_conf 996652688714887666----6779992399972270597788888999988889888

HHsearch alignment for GI: 254780941 and conserved domain: cd04170