>cd01901 Ntn_hydrolase The Ntn hydrolases (N-terminal nucleophile) are a diverse superfamily of of enzymes that are activated autocatalytically via an N-terminally lcated nucleophilic amino acid. N-terminal nucleophile (NTN-) hydrolase superfamily, which contains a four-layered alpha, beta, beta, alpha core structure. This family of hydrolases includes penicillin acylase, the 20S proteasome alpha and beta subunits, and glutamate synthase. The mechanism of activation of these proteins is conserved, although they differ in their substrate specificities. All known members catalyze the hydrolysis of amide bonds in either proteins or small molecules, and each one of them is synthesized as a preprotein. For each, an autocatalytic endoproteolytic process generates a new N-terminal residue. This mature N-terminal residue is central to catalysis and acts as both a polarizing base and a nucleophile during the reaction. The N-terminal amino group acts as the proton acceptor and activates either t

Probab=99.76 E-value=1.7e-16 Score=122.97 Aligned_cols=150 Identities=27% Similarity=0.249 Sum_probs=119.8 Q ss_pred EEEEEEEECCEEEEEECCCCCCCCEEEECCCEEEEEECCCEEEEEECCHHHHHHHHHHHHHHHHHHHCCCCCC--CHHHH Q ss_conf 1799999799799981365450536774451057981597599973130588999999999999985366563--06799 Q gi|254780828|r 16 TTILTVRKDGVVVIAGDGQVSLGQTVMKANARKVRRLGKGNIIAGFAGSSADAFTLLERLEKKLEQYPNQLLR--SSVEL 93 (190) Q Consensus 16 TTivgi~~~dgVviAaDtR~S~G~~v~sr~~~KI~~i~d~~~~~g~ag~a~d~~~~~~~~~~~~~~~~~~~~~--~~~~~ 93 (190) T Consensus 1 ~t~i~i~~~~~vvla~d~~~~~~~~~~~~~~~k~~~~~~~~~~-~~~g~~~d~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 79 (164) T cd01901 1 STSVAIKGKGGVVLAADKRLSSGLPVAGSPVIKIGKNEDGIAW-GLAGLAADAQTLVRRLREALQLYRLRYGEPISVVAL 79 (164) T ss_pred CCEEEEEECCEEEEEECCCCCCCCEECCCCCCEEEEECCCEEE-EECCCCHHHHHHHHHHHHHHHHHHHHHCCCCCHHHH T ss_conf 9599999799999998687676888326875528994797899-974566079999999999999999998899989999 Q ss_pred HHHHHHHHHHH----HCCC--EEEECCCCCCEEEEECCCCCEECC-CEEEEECCHHHHHHHHHHHHCCCCCHHHHHHHHH Q ss_conf 99997611222----0131--045137876469980586311413-2799606423457889852078999899999999 Q gi|254780828|r 94 AKDWRMDKYLR----NLEA--MILIADKTITLVITGMGDVLEPEN-GVMAIGSGGSYALSAARALMSTQNSAEEIARKAM 166 (190) Q Consensus 94 ~~~~~~~~y~~----~~~~--~~~~~~~~~~~~~~~d~~g~~~~~-~~~a~GSGs~~A~g~Le~~y~~~~sa~ela~~Al 166 (190) T Consensus 80 a~~~~~~~~~~~~~~p~~~~~iv~g~~~~~~~l~~id~~g~~~~~~~~~~~g~~~~~~~~~l~~~~~~~~~~~~~~~~~~ 159 (164) T cd01901 80 AKELAKLLQVYTQGRPFGVNLIVAGVDEGGGNLYYIDPSGPVIENPGAVATGSRSQRAKSLLEKLYKPDMTLEEAVELAL 159 (164) T ss_pred HHHHHHHHHHHCCCCCCEEEEEEEEECCCCCEEEEECCCCCEEECCCEEEECCCHHHHHHHHHHHCCCCCCHHHHHHHHH T ss_conf 99999999984487872489999997199988999968986675498678667509999999965659869999999999

HHsearch alignment for GI: 254780828 and conserved domain: cd01901