>TIGR00761 argB acetylglutamate kinase; InterPro: IPR004662 N -Acetylglutamate (NAG) fulfils distinct biological roles in lower and higher organisms. In prokaryotes, lower eukaryotes and plants it is the first intermediate in the biosynthesis of arginine, whereas in ureotelic (excreting nitrogen mostly in the form of urea) vertebrates, it is an essential allosteric cofactor for carbamyl phosphate synthetase I (CPSI), the first enzyme of the urea cycle. The pathway that leads from glutamate to arginine in lower organisms employs eight steps, starting with the acetylation of glutamate to form NAG. In these species, NAG can be produced by two enzymatic reactions: one catalysed by NAG synthase (NAGS) and the other by ornithine acetyltransferase (OAT). In ureotelic species, NAG is produced exclusively by NAGS. In lower organisms, NAGS is feedback-inhibited by L-arginine, whereas mammalian NAGS activity is significantly enhanced by this amino acid. The NAGS genes of bacteria, fungi and mammals are more diverse than other arginine-biosynthesis and urea-cycle genes. The evolutionary relationship between the distinctly different roles of NAG and its metabolism in lower and higher organisms remains to be determined . The pathway from glutamate to arginine is: NAGS; N-acetylglutamate synthase (2.3.1.1 from EC) (glutamate to N-acetylglutamate) NAGK; N-acetylglutamate kinase (2.7.2.8 from EC) (N-acetylglutamate to N-acetylglutamate-5P) NAGSA; N-acetyl-gamma-glutamyl-phosphate reductase (1.2.1.38 from EC) (N-acetylglutamate-5P to N-acetylglumate semialdehyde) Acetylornithine aminotransferase (2.6.1.11 from EC) (N-acetylglumate semialdehyde to N-acetylornithine) Acetylornithine deacetylase (3.5.1.16 from EC) (N-acetylornithine to ornithine) Arginase (3.5.3.1 from EC) (ornithine to arginine) This entry describes N-acetylglutamate kinases (ArgB) of many prokaryotes and the N-acetylglutamate kinase domains of multifunctional proteins from yeasts as well as some, as yet, uncharacterised proteins.; GO: 0003991 acetylglutamate kinase activity, 0006526 arginine biosynthetic process, 0005737 cytoplasm.

Probab=99.61 E-value=1.1e-14 Score=110.05 Aligned_cols=199 Identities=18% Similarity=0.231 Sum_probs=123.6 Q ss_pred EEEEEEEEEEECCCCCCCCHHHHHHHHHHHHHHHHCCCE-EEEEECCCCCHHHH-H----HHC--CCC-----CCCCHHH Q ss_conf 999940036853887770899999999999999976990-99982365410233-4----420--377-----7754024 Q gi|254780777|r 9 VLLKVSGEALAGISGFGVDIDSVNRICADIAEVYAKGIE-IGIVVGGGNIFRGS-Q----VVA--ENY-----LLCERST 75 (242) Q Consensus 9 IViKiGGSsL~~~~~~~~~~~~i~~ia~~I~~~~~~g~~-vviV~sg~~~~~~~-~----~~~--~~~-----~~~~~~~ 75 (242) T Consensus 2 ~ViK~GG~~~~~~-------~~~~~~~~~~~~l~~~g~~PpviVHGGGp~in~~~~~lgi~~~f~~Gl~G~~~RvTd~~t 74 (254) T TIGR00761 2 IVIKIGGSAISND-------ELLEEFFSDIAFLRAVGIKPPVIVHGGGPEINELLEALGIEPEFKNGLSGVVFRVTDKET 74 (254) T ss_pred EEEEECCEEECCC-------HHHHHHHHHHHHHHHCCCCCCEEEECCCHHHHHHHHHCCCCCEEECCCCCEEEECCCHHH T ss_conf 7898447341041-------246999999999997298553898378526888998328983676688720375278899 Q ss_pred HHHHHHHHHHHHHHHHHHHHHHHCCCCCCCCCCHH------------HHH--------------HHHHHHHHHCCHHHHC Q ss_conf 67888889899999999999761886411340010------------024--------------5665432100001100 Q gi|254780777|r 76 VDSMGMLSTVINALALDLALRKINVPTVILSSIFM------------PQV--------------CEVFSCRNAVSYLSQG 129 (242) Q Consensus 76 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~------------~~~--------------~~~~~~~~~~~~~~~~ 129 (242) T Consensus 75 l~v~~~vL~g~vN~~LV~~l~~~g~~A~GL~g~Dg~L~~a~rk~~~~~~~~~~vv~~~~G~VG~~~~Vn~~~~~~Ll~~G 154 (254) T TIGR00761 75 LEVVEMVLIGDVNKELVALLNKHGINAIGLTGLDGQLFTADRKTASLDKEVIKVVAIDLGYVGEIKKVNKALLEALLKAG 154 (254) T ss_pred HHHHHHHHHHHHHHHHHHHHHHCCCCEEEECCCCCCEEEEEEEEEEEEECCCEEEEEECCCEEEECCCCHHHHHHHHHCC T ss_conf 99989998364669999999967992863113577357999878988515768999974841231327889999999649 Q ss_pred CCCCCCCCC------CCCCCCCHHHHHHHHHHHCHHHHHHCCCCCCCCCCCCCCCCCCCCCCCCCH-HHHHH-------C Q ss_conf 111112465------567776215788888641644665147543512343223444444441159-99985-------5 Q gi|254780777|r 130 KVVIFSGGT------GNAFLTTDSAAALRASEIGADVILKGTQVDGVYSADPRVHASSTRFDSLTY-NQFIE-------K 195 (242) Q Consensus 130 ~~~~~~~~~------~~~~~~~D~~a~~ia~~~~ad~l~i~tdvdGiyt~dP~~~~~ak~i~~is~-~e~l~-------~ 195 (242) T Consensus 155 ~~PVi~sla~~~~~g~~lNvNAD~aA~~lA~~L~A~kL~~LtDv~Gi~~~y~---d~~~~i~~l~~D~~~~~l~~~~~i~ 231 (254) T TIGR00761 155 IIPVIASLALTNAEGQALNVNADTAAGELAAALGAEKLVLLTDVPGILNGYP---DKQSLISELPLDEEIEQLIKQGVIK 231 (254) T ss_pred CCCEECCCCCCHHCCCEEECCHHHHHHHHHHHCCCCEEEEECCCHHHHCCCC---CCCCEECCCCHHHHHHHHHHHHHHC T ss_conf 8517716658623187770677799999998609953888417403225888---7461402268679999877522231 Q ss_pred CCCCCCHHHHHHHHHCCCCEEE Q ss_conf 9981409999999974996999 Q gi|254780777|r 196 GLKVMDCASVVLARDCSIPIIV 217 (242) Q Consensus 196 G~~v~~~~A~~~a~~~gI~v~I 217 (242) T Consensus 232 gGMipKV~~a~~A~~~Gv~~v~ 253 (254) T TIGR00761 232 GGMIPKVNAALEALESGVKSVI 253 (254) T ss_pred CCCHHHHHHHHHHHHCCCCEEC T ss_conf 5985789999999973888003

HHsearch alignment for GI: 254780777 and conserved domain: TIGR00761