HHsearch alignment for GI: 254780949 and conserved domain: TIGR00392

>TIGR00392 ileS isoleucyl-tRNA synthetase; InterPro: IPR002301 The aminoacyl-tRNA synthetases (6.1.1. from EC) catalyse the attachment of an amino acid to its cognate transfer RNA molecule in a highly specific two-step reaction. These proteins differ widely in size and oligomeric state, and have limited sequence homology . The 20 aminoacyl-tRNA synthetases are divided into two classes, I and II. Class I aminoacyl-tRNA synthetases contain a characteristic Rossman fold catalytic domain and are mostly monomeric . Class II aminoacyl-tRNA synthetases share an anti-parallel beta-sheet fold flanked by alpha-helices , and are mostly dimeric or multimeric, containing at least three conserved regions , , . However, tRNA binding involves an alpha-helical structure that is conserved between class I and class II synthetases. In reactions catalysed by the class I aminoacyl-tRNA synthetases, the aminoacyl group is coupled to the 2'-hydroxyl of the tRNA, while, in class II reactions, the 3'-hydroxyl site is preferred. The synthetases specific for arginine, cysteine, glutamic acid, glutamine, isoleucine, leucine, methionine, tyrosine, tryptophan and valine belong to class I synthetases; these synthetases are further divided into three subclasses, a, b and c, according to sequence homology. The synthetases specific for alanine, asparagine, aspartic acid, glycine, histidine, lysine, phenylalanine, proline, serine, and threonine belong to class-II synthetases . Isoleucyl-tRNA synthetase (6.1.1.5 from EC) is an alpha monomer that belongs to class Ia. The enzyme, isoleucyl-transfer RNA synthetase, activates not only the cognate substrate L-isoleucine but also the minimally distinct L-valine in the first, aminoacylation step. Then, in a second, "editing" step, the synthetase itself rapidly hydrolyzes only the valylated products , as shown from the crystal structures. ; GO: 0000166 nucleotide binding, 0004822 isoleucine-tRNA ligase activity, 0005524 ATP binding, 0006412 translation, 0006428 isoleucyl-tRNA aminoacylation, 0005737 cytoplasm.
Probab=97.45  E-value=0.00015  Score=50.27  Aligned_cols=74  Identities=22%  Similarity=0.226  Sum_probs=51.5

Q ss_pred             CCEECCCCHH---HHHHHHHHHHHHH-CCCC-CEEEEEECEEECCCCHHHHHHHHCCCCCCCCCCCHHHHHHHHHH----
Q ss_conf             7020154125---8899888999973-1679-71798311023687102235431012333457997999998862----
Q gi|254780949|r  193 CRLQMGGSDQ---WGNIICGIDLGER-LKTP-KLFALTSPLLTTASGTKMGKTLSGAIWLNKEMTSPYNFWQYWRN----  263 (418)
Q Consensus       193 ~~iqiGGsDQ---wgNi~~G~eLir~-~~~~-~~~glT~PLLt~~dG~KmgKS~~naIwLd~~~tSPy~fyQf~~n----  263 (418)
T Consensus       621 AD~i~EG~DQ~RGWFySsl~~~~~~~nv~~~PYK~Vi~hGF~LDe~G~KMSKSlGNvV-------~P~~----v~~G~~N  689 (938)
T TIGR00392       621 ADFILEGSDQTRGWFYSSLLIGVALFNVGKAPYKNVITHGFTLDEKGRKMSKSLGNVV-------DPEK----VINGDEN  689 (938)
T ss_pred             CEEEEECCCCCCHHHHHHHHHHHHHHCCCCCCCCEEEECCEEECCCCCCCCCCCCCCC-------CHHH----HCCCCCC
T ss_conf             0268603355532779999999998707885436345315488577854453258703-------8599----7088433


Q ss_pred             ----HCHHHHHHHHHHHC
Q ss_conf             ----07888987997506
Q gi|254780949|r  264 ----IDDADVVSFAKRLT  277 (418)
Q Consensus       264 ----~~D~dV~kyLklfT  277 (418)
T Consensus       690 ~~~P~yGAD~LRlyv~~~  707 (938)
T TIGR00392       690 LKLPKYGADILRLYVASS  707 (938)
T ss_pred             CCCCCCCCHHHHHHHHHC
T ss_conf             588753304877778846