>gnl|CDD|133370 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 contains only bacterial members. Length = 268

 Score = 89.9 bits (224), Expect = 2e-18
 Identities = 49/153 (32%), Positives = 76/153 (49%), Gaps = 14/153 (9%)

Query: 13  NFSIVAHIDHGKSTLADRFIQHCRGLTER----EMSSQVLDNMDIERERGITIKAQTVRL 68
           N ++V H   GK+TLA+  + +  G  +R    E  + V D    E +R ++I      L
Sbjct: 1   NIALVGHSGSGKTTLAEA-LLYATGAIDRLGSVEDGTTVSDYDPEEIKRKMSISTSVAPL 59

Query: 69  NYTSTDAKDYQLNLIDTPGHVDFTYEVSRSLSACEGSLLVVDATQGVEAQTLANVYQAID 128
            +     K +++NLIDTPG+ DF  E   +L A + +L+VV A  GVE  T   +++  D
Sbjct: 60  EW-----KGHKINLIDTPGYADFVGETRAALRAADAALVVVSAQSGVEVGT-EKLWEFAD 113

Query: 129 NNHEI--ITVLNKADLPSADPDRVKKQIEETIG 159
               I  I  +NK D   AD D+    ++E  G
Sbjct: 114 -EAGIPRIIFINKMDRERADFDKTLAALQEAFG 145