>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 =  104 bits (262), Expect = 7e-23
 Identities = 47/146 (32%), Positives = 76/146 (52%), Gaps = 2/146 (1%)

Query: 21  NIAIIAHVDHGKTTLVDELLKQSGVFRDNQRVSE--RVMDCNDLEKERGITILAKVTSIV 78
           NIA++ H   GKTTL + LL  +G       V +   V D +  E +R ++I   V  + 
Sbjct: 1   NIALVGHSGSGKTTLAEALLYATGAIDRLGSVEDGTTVSDYDPEEIKRKMSISTSVAPLE 60

Query: 79  WNDVRINIVDTPGHADFGGEVERILCMVESVVVLVDAAEGPMPQTKFVVGKALKIGLRPI 138
           W   +IN++DTPG+ADF GE    L   ++ +V+V A  G    T+ +   A + G+  I
Sbjct: 61  WKGHKINLIDTPGYADFVGETRAALRAADAALVVVSAQSGVEVGTEKLWEFADEAGIPRI 120

Query: 139 VVVNKVDRSDARADEVINEVFDLFSA 164
           + +NK+DR  A  D+ +  + + F  
Sbjct: 121 IFINKMDRERADFDKTLAALQEAFGR 146