Elongation factor Tu consists of three structural domains, this is the third domain. This domain adopts a beta barrel structure. This the third domain is involved in binding to both charged tRNA [1] and binding to EF-Ts Pfam:PF00889 [2].

1: Crystal structure of the ternary complex of Phe-tRNAPhe, EF-Tu, and a GTP analog. Nissen P, Kjeldgaard M, Thirup S, Polekhina G, Reshetnikova L, Clark BF, Nyborg J; Science 1995;270:1464-1472. PMID:7491491

2: Crystal structure of the EF-Tu.EF-Ts complex from Thermus thermophilus. Wang Y, Jiang Y, Meyering-Voss M, Sprinzl M, Sigler PB; Nat Struct Biol 1997;4:650-656. PMID:9253415