>TIGR00457 asnS asparaginyl-tRNA synthetase; InterPro: IPR004522 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 . AsparaginyltRNA synthetase (6.1.1.22 from EC) is an alpha2 dimer that belongs to class IIb. There is a striking similarity between asparaginyl-tRNA synthetases and archaeal/eukaryotic type aspartyl-tRNA synthetases (IPR004523 from INTERPRO) and a striking divergence of bacterial type aspartyl-tRNA synthetases (IPR004524 from INTERPRO). This family, AsnS, represents asparaginyl-tRNA synthetases from the three domains of life. Some species lack this enzyme and charge tRNA(asn) by misacylation with Asp, followed by transamidation of Asp to Asn.; GO: 0000166 nucleotide binding, 0004816 asparagine-tRNA ligase activity, 0005524 ATP binding, 0006412 translation, 0006421 asparaginyl-tRNA aminoacylation, 0005737 cytoplasm.

Probab=95.74  E-value=0.029  Score=33.83  Aligned_cols=124  Identities=20%  Similarity=0.393  Sum_probs=72.7

Q ss_pred             CCHHHHHHHHHHHHHHHHHHHHCCCEEEECCCHHHHHHHHCCCCCCCCCCCCEEEEEC-------CC-----------CC
Q ss_conf             8866899999999999999998598480165202288752026755433322168986-------99-----------98
Q gi|254780928|r   18 CPTKEIRIRNRILDSIRNIYENYGFDPIETPLLEYSDSLGKFLPDEDRPNKGVFSLQD-------DD-----------GQ   79 (496)
Q Consensus        18 ~~p~~~~~~~~i~~~l~~~f~~~G~~~I~tP~lE~~~~~~~~~~~~~~~~k~~y~f~D-------~~-----------g~   79 (496)
T Consensus       141 ~~~AvmrvR~~l~~ai~~yF~~~gF~~V~~PilT~~d~------EG---AGElF~v~TLdl~~lp~~~g~~df~~~fFgk  211 (495)
T TIGR00457       141 TLGAVMRVRNALSQAIHEYFQKNGFVKVSPPILTSNDC------EG---AGELFKVSTLDLEKLPRNDGKIDFSKDFFGK  211 (495)
T ss_pred             HHHHHHHHHHHHHHHHHHHHHCCCCEEECCCEEECCCC------CC---CCCCCEEEEHHHHCCCCCCCCCCCCCCCCCC
T ss_conf             87789999999999999876047867868863113688------88---7543322003242153326888763024886


Q ss_pred             EEEECCCCHHHHHHHHHHHHHHCCCCHHHHHHHHHHCCCCCCCC-CCCCCCCCCHHHHHCC--CH--HHHHHHHHHHHHH
Q ss_conf             89998888389999999511205541123310133302587644-4211111000121000--02--4578899999999
Q gi|254780928|r   80 WISLRYDLTAPLARYVAENFDTIVFPCRTYRIGPVFRNEKHGPG-RFRQFIQCDVDNVGSS--AE--TADAEMCMMMADT  154 (496)
Q Consensus        80 ~l~LRpDlT~~~aR~~~~~~~~~~~p~k~yy~g~vfR~e~p~~G-r~REf~Q~g~eiiG~~--~~--~~DaEii~l~~~~  154 (496)
T Consensus       212 ~ay----LTVSG-QL~~E~~A-~AL-~kvyTfGPTFRAEkS~T~RHLsEFWMiEPE~AF~~l~d~~~~~E~~~k~~~k~V  284 (495)
T TIGR00457       212 EAY----LTVSG-QLYAEAYA-LAL-SKVYTFGPTFRAEKSNTSRHLSEFWMIEPEMAFANLNDLLQLIETLIKYIIKAV  284 (495)
T ss_pred             EEE----EEECC-HHHHHHHH-HHH-CCCEECCCCEECCCCCCCCCHHHHHHHHHHEEECCHHHHHHHHHHHHHHHHHHH
T ss_conf             012----33022-78999999-974-781445874004286487011122101120000013333899999999999998


Q ss_pred             HHH
Q ss_conf             975
Q gi|254780928|r  155 LEA  157 (496)
Q Consensus       155 l~~  157 (496)
T Consensus       285 L~~  287 (495)
T TIGR00457       285 LEN  287 (495)
T ss_pred             HCC
T ss_conf             305