>gnl|CDD|129096 smart00863, tRNA_SAD, Threonyl and Alanyl tRNA synthetase second additional domain. The catalytically active form of threonyl/alanyl tRNA synthetase is a dimer. Within the tRNA synthetase class II dimer, the bound tRNA interacts with both monomers making specific interactions with the catalytic domain, the C-terminal domain, and this SAD domain (the second additional domain). The second additional domain is comprised of a pair of perpendicularly orientated antiparallel beta sheets, of four and three strands, respectively, that surround a central alpha helix that forms the core of the domain. Length = 44

 Score = 63.2 bits (155), Expect = 2e-10
 Identities = 20/52 (38%), Positives = 30/52 (57%), Gaps = 9/52 (17%)

Query: 171 VTLYRQGEWF-DLCRGPHVRSTGQVKKFFKLMKVAGAYWRGDSNRPMLSRIY 221
           V +   G++  +LC G HV +TG++   FK++ V+GAYW        L RIY
Sbjct: 1   VRVVSIGDFDVELCGGTHVPNTGEI-GAFKILSVSGAYWG-------LQRIY 44