>TIGR01369 CPSaseII_lrg carbamoyl-phosphate synthase, large subunit; InterPro: IPR006275 Carbamoyl phosphate synthase (CPSase) is a heterodimeric enzyme composed of a small and a large subunit (with the exception of CPSase III, see below). CPSase catalyses the synthesis of carbamoyl phosphate from biocarbonate, ATP and glutamine (6.3.5.5 from EC) or ammonia (6.3.4.16 from EC), and represents the first committed step in pyrimidine and arginine biosynthesis in prokaryotes and eukaryotes, and in the urea cycle in most terrestrial vertebrates , . CPSase has three active sites, one in the small subunit and two in the large subunit. The small subunit contains the glutamine binding site and catalyses the hydrolysis of glutamine to glutamate and ammonia. The large subunit has two homologous carboxy phosphate domains, both of which have ATP-binding sites; however, the N-terminal carboxy phosphate domain catalyses the phosphorylation of biocarbonate, while the C-terminal domain catalyses the phosphorylation of the carbamate intermediate . The carboxy phosphate domain found duplicated in the large subunit of CPSase is also present as a single copy in the biotin-dependent enzymes acetyl-CoA carboxylase (6.4.1.2 from EC) (ACC), propionyl-CoA carboxylase (6.4.1.3 from EC) (PCCase), pyruvate carboxylase (6.4.1.1 from EC) (PC) and urea carboxylase (6.3.4.6 from EC). Most prokaryotes carry one form of CPSase that participates in both arginine and pyrimidine biosynthesis, however certain bacteria can have separate forms. The large subunit in bacterial CPSase has four structural domains: the carboxy phosphate domain 1, the oligomerisation domain, the carbamoyl phosphate domain 2 and the allosteric domain . CPSase heterodimers from Escherichia coli contain two molecular tunnels: an ammonia tunnel and a carbamate tunnel. These inter-domain tunnels connect the three distinct active sites, and function as conduits for the transport of unstable reaction intermediates (ammonia and carbamate) between successive active sites . The catalytic mechanism of CPSase involves the diffusion of carbamate through the interior of the enzyme from the site of synthesis within the N-terminal domain of the large subunit to the site of phosphorylation within the C-terminal domain. Eukaryotes have two distinct forms of CPSase: a mitochondrial enzyme (CPSase I) that participates in both arginine biosynthesis and the urea cycle; and a cytosolic enzyme (CPSase II) involved in pyrimidine biosynthesis. CPSase II occurs as part of a multi-enzyme complex along with aspartate transcarbamoylase and dihydroorotase; this complex is referred to as the CAD protein . The hepatic expression of CPSase is transcriptionally regulated by glucocorticoids and/or cAMP . There is a third form of the enzyme, CPSase III, found in fish, which uses glutamine as a nitrogen source instead of ammonia . CPSase III is closely related to CPSase I, and is composed of a single polypeptide that may have arisen from gene fusion of the glutaminase and synthetase domains . This entry represents glutamine-dependent CPSase (6.3.5.5 from EC) from prokaryotes and eukaryotes (CPSase II). ; GO: 0004086 carbamoyl-phosphate synthase activity, 0006807 nitrogen compound metabolic process.

Probab=100.00 E-value=0 Score=1063.69 Aligned_cols=491 Identities=31% Similarity=0.491 Sum_probs=420.2 Q ss_pred CCCCEEEEECCCCEEECCCCCCCHHHHHHHHHHHHCCCCEEEEECCCCCCCCCCCCCCEEEEEECCHHHHHHHHHHHCCC Q ss_conf 77741899727630201476653189999999996598069960686521123245863798416788999999874856 Q gi|254780439|r 616 SDRKKIVILGGGPNRIGQGIEFDYCCCHASFSLKEAGFETIMINCNPETVSTDYDIADRLYFESLTEEDILEILRVEQQK 695 (1162) Q Consensus 616 ~~~kkviVlGsGp~RIGqgiEFDy~~v~a~~aLr~~G~~tImIN~NPETVSTDyd~sDrLYFEplt~E~V~~I~~~E~p~ 695 (1162) T Consensus 4 ~~i~kvLviGSGPi~IGQAaEFDYSGsQAcKALkEEGy~viLVNsNpATimTD~~~AD~vY~ePlT~e~V~~IIEKERPD 83 (1089) T TIGR01369 4 TDIKKVLVIGSGPIVIGQAAEFDYSGSQACKALKEEGYEVILVNSNPATIMTDPEMADKVYIEPLTPEAVEKIIEKERPD 83 (1089) T ss_pred CCCCEEEEECCCCCCHHHHCCCHHHHHHHHHHHHHCCCEEEEECCCCCCCCCCHHHCCCCCCCCCCHHHHHHHHHHCCCC T ss_conf 88878999666731131202302478999999876495799975884723388668660025254588886665316866 Q ss_pred CCCCEEEEECCCHHHHHHHHHHH------HCCCEEEECCCCHHHHCCCHHHHHHHHHHCCCCCCCCCCCCCHHHHHHHHH Q ss_conf 78227998445124668988888------759838612752033102867899988870986685421121566555655 Q gi|254780439|r 696 GELVGIIVQFGGQTPLKLSKILE------KNQIPILGTQPDSIDLAEDRDRFQKLLMELDLNQPRNGISHSVEHARLIAC 769 (1162) Q Consensus 696 g~~~~vi~q~gGqt~~~la~~L~------~~gv~ilGts~~~Id~aEDR~~F~~ll~~l~i~~p~~~~a~s~eea~~~a~ 769 (1162) T Consensus 84 g----iL~t~GGQTALNlav~L~~~GVL~kYgV~vLGT~~eaI~kaEDRe~F~~~M~ei~~pvp~S~~~~~~eEA~~~a~ 159 (1089) T TIGR01369 84 G----ILPTLGGQTALNLAVELEESGVLEKYGVEVLGTPVEAIKKAEDRELFREAMKEIGEPVPKSEIVHSVEEALKAAK 159 (1089) T ss_pred C----HHCCCCCHHHHHHHHHHHHCCCCHHHCCEEECCCHHHHHHHCCHHHHHHHHHHCCCCCCCCCCCCCHHHHHHHHH T ss_conf 0----002576035777788662068514529178523424352020279999999973899881100278899999996 Q ss_pred HCCCCEEEECCCCCCCCCCEEECCHHHHHHHHHHHHHHCCCCCCCCCCCCCCCCCCCCCCCCCCEEEEEECCCCEEEEEE Q ss_conf 36971675134444565412554899999999975210132211112233333333455777745670220120100101 Q gi|254780439|r 770 EIGFPLLIRPSYVLGGRAMQIVYSENMLQDYLLDTLPGLVSEEIKRQYPNDKTGQINTLLGTHPLLFDSYLSDAMEIDVD 849 (1162) Q Consensus 770 ~iGyPVLVRPSyVLGG~~M~Iv~~~~eL~~yl~~a~~~~~~~~~~~~~~~~~~~~~~~vs~~~pVlIdkfl~~a~EiEVD 849 (1162) T Consensus 160 ~~GyPviVRpAftLGG~GgGiA~n~eEL~~~~~~aL~---------------------~SpI~qvL~EkSl~GWKE~EYE 218 (1089) T TIGR01369 160 EIGYPVIVRPAFTLGGTGGGIASNEEELKEIVERALS---------------------ASPINQVLVEKSLAGWKEIEYE 218 (1089) T ss_pred HCCCCEEECCCHHCCCCCCCEECCHHHHHHHHHHHHH---------------------HCCCCEEEEEEECCCCEEEEEE T ss_conf 2689689810032388998522577899999998863---------------------0888557501100331788988 Q ss_pred EEEECC-CEEEEEEECCCCHHCCCCCCEEEEECCCCCCHHHHHHHHHHHHHHHHHCCCCCC-CEEEEEEC--CCEEEEEE Q ss_conf 023079-849998520110215245762798168668999999999999999874133576-24788512--88599985 Q gi|254780439|r 850 ALCQND-QVIVVGIIEHIEEAGIHSGDSACSLPSRSLSQQLKDELISQTKALAGALNVIGL-INVQYAIK--DGKIYILE 925 (1162) Q Consensus 850 ai~Dg~-~v~I~gimEHiE~aGVHSGDS~~v~PpqsLs~~~~~~i~~~t~~ia~~L~v~G~-~NIQfa~k--d~~iYVIE 925 (1162) T Consensus 219 VmRD~~dNCItVCNmEN~DPmGVHTGdSIVVAPSQTLtD~EYQ~LR~~sikIIR~lGi~GgGCNvQFAL~P~s~~Y~vIE 298 (1089) T TIGR01369 219 VMRDSKDNCITVCNMENFDPMGVHTGDSIVVAPSQTLTDKEYQMLRDASIKIIRELGIVGGGCNVQFALDPDSGRYYVIE 298 (1089) T ss_pred EEEECCCCEEEEECCCCCCCCCEEECCCEEECCCCCCCCHHHHHHHHHHHHHHHHCCCEECCCCEEEEECCCCCCEEEEE T ss_conf 98626878899974547689845707833650763688078999999999999873912167421321507897069998 Q ss_pred ECCCCCCCHHHHHHHHCCCHHHHHHHHHCCCCCCCCCCCCCCCCCC---CCCCEEEEEEECCCHHHCCCCCCCCCCCCCC Q ss_conf 2444456304567773988999999998597210024666677776---6687389972038834459998670775631 Q gi|254780439|r 926 VNPRASRTVPFIAKAIGFPVAKVAARIIAGESLDASIAAYGKRPDL---SQIKHFAVKESVFPFNKFPGVDILLGPEMRS 1002 (1162) Q Consensus 926 vNpRaSRtvPfvSKatG~pl~~iAt~v~lG~~L~~~~~~~~~~~~~---~~~~~~aVK~pvFsF~k~~g~D~~LGpEMkS 1002 (1162) T Consensus 299 vNPRvSRSSALASKATGYPiAkvAAKLAvGY~LdEl~N~vT~~T~A~FEPSLDYvVvKIPRW~f~KF~~v~r~LGt~MKS 378 (1089) T TIGR01369 299 VNPRVSRSSALASKATGYPIAKVAAKLAVGYGLDELKNPVTKTTPASFEPSLDYVVVKIPRWDFDKFEGVDRKLGTQMKS 378 (1089) T ss_pred ECCCCCHHHHHHHHHHCCHHHHHHHHHHCCCCCCCCCCCCCCCCCCCCCCCCCEEEECCCCCCCHHHCCCCCCCCCEEEE T ss_conf 67882135898766516628999999846887876568888853541046748088606788722105788541521015 Q ss_pred CEEEEEEECCHHHHHHHHHHHCCCCCCC---CCEEEEEECCHHHHHHHHH--HHH---HHHCCCEEEEEHHHHHHHHHCC Q ss_conf 0137774199999999999983887988---7259999644128999999--999---9988989999388899999879 Q gi|254780439|r 1003 TGEVIGIDQDFPLAFAKSQLGIGVDLPH---EGTVFVSVRDADKKRIVPI--IQN---FKKLGFKIMATEGTARFLESHG 1074 (1162) Q Consensus 1003 TGEVmgig~~~~eA~~Ka~~a~g~~lP~---~g~vfisv~d~dK~~~~~~--a~~---l~~lGf~l~AT~GTa~~L~~~G 1074 (1162) T Consensus 379 vGEVMAIGRtFEEALQKA~Rsle~~~~Gf~~~~~~~~~~~~~~~~~~l~~p~d~RPYW~f~i----------~~Al~-~G 447 (1089) T TIGR01369 379 VGEVMAIGRTFEEALQKALRSLEIGLLGFEFDLPDKEVESDEDLEEALKKPTDRRPYWIFAI----------AEALR-RG 447 (1089) T ss_pred EEEEECCCCCHHHHHHHHHHHHCCCCCCCCCCCCCCCCCCHHHHHHHHHCCCCCCCCHHHHH----------HHHHH-CC T ss_conf 77773467138999989887653784113644562000357899999728698876189989----------99987-58 Q ss_pred CEEEEEECCCCC-------CCCHH---HHHHCC--CEEEEEECCCC--CCCCCCHHHHHHHHHHCCCCEEECHHHHHHHH Q ss_conf 815697505687-------81078---898679--85499967899--85231108999999970997994599999999 Q gi|254780439|r 1075 LETQKINKVLEG-------RPHIE---DAISNR--QVHLVINTTEG--KKAIEDSKSLRRATLIRKIPYYTTIAGADAVF 1140 (1162) Q Consensus 1075 i~~~~v~k~~e~-------~~~i~---d~i~~~--~i~lVINt~~~--~~~~~dg~~iRr~Ai~~~ip~~T~~~~a~a~~ 1140 (1162) T Consensus 448 ~~V~~~~ElT~ID~wFL~k~~~iV~~e~~l~~~~n~~~~I~~~~~e~L~~aK~lGFSD~~iA~~~~~~~~~~~~--~~~v 525 (1089) T TIGR01369 448 VSVEEIHELTKIDRWFLHKIKNIVELEKELEELKNKLTGIEELDKELLRKAKKLGFSDAQIARLVNVTEAESIE--ELEV 525 (1089) T ss_pred CCHHHHHHHHCCCHHHHHHHHHHHHHHHHHHHHHCCCCCCCCCCHHHHHHHHHCCCCHHHHHHHHCCCHHHCCC--HHHH T ss_conf 86899986527888899999999999999875301244533489889999864188878999986897444200--6899 Q ss_pred HHHH Q ss_conf 9999 Q gi|254780439|r 1141 QAIQ 1144 (1162) Q Consensus 1141 ~al~ 1144 (1162) T Consensus 526 R~~R 529 (1089) T TIGR01369 526 RKLR 529 (1089) T ss_pred HHHH T ss_conf 9999

HHsearch alignment for GI: 254780439 and conserved domain: TIGR01369