HHsearch alignment for GI: 254780268 and conserved domain: TIGR01161

>TIGR01161 purK phosphoribosylaminoimidazole carboxylase, ATPase subunit; InterPro: IPR005875 Phosphoribosylaminoimidazole carboxylase is a fusion protein in plants and fungi, but consists of two non-interacting proteins in bacteria, PurK and PurE. This family represents PurK, N5-carboxyaminoimidazole ribonucleotide (N5_CAIR) synthetase, which catalyzes the conversion of 5-aminoimidazole ribonucleotide (AIR), ATP, and bicarbonate to N5-CAIR, ADP, and Pi. PurE converts N5-CAIR to CAIR. In the presence of high concentrations of bicarbonate, PurE is reported able to convert AIR to CAIR directly and without ATP. PurK belongs to the ATP grasp superfamily of C-N ligase enzymes. Each subunit of PurK is composed of three domains (A, B, and C). The B domain contains a flexible, glycine-rich loop (B loop, T123-G130) that is disordered in the sulphate-PurK structure and becomes ordered in the MgADP-PurK structure. MgADP is wedged between the B and C domains, as with all members of the ATP grasp superfamily. Other enzymes in this superfamily contain a conserved Omega loop proposed to interact with the B loop, define the specificity of their nonnucleotide substrate, and protect the acyl phosphate intermediate formed from this substrate. PurK contains a minimal Omega loop without conserved residues. In the reaction catalyzed by PurK, carboxyphosphate is the putative acyl phosphate intermediate. The sulphate of the sulphate ion-liganded PurK interacts electrostatically with Arg 242 and the backbone amide group of Asn 245, components of the J loop of the C domain. This sulphate may reveal the location of the carboxyphosphate binding site. Conserved residues within the C-terminus of the C domain define a pocket that is proposed to bind AIR in collaboration with an N-terminal strand loop helix motif in the A domain (P loop, G8-L1). The P loop is proposed to bind the phosphate of AIR on the basis of similar binding sites observed in PurN and PurE and proposed in PurD and PurT, four other enzymes in the purine pathway .; GO: 0004638 phosphoribosylaminoimidazole carboxylase activity, 0006189 'de novo' IMP biosynthetic process, 0009320 phosphoribosylaminoimidazole carboxylase complex.
Probab=100.00  E-value=2.9e-31  Score=242.39  Aligned_cols=263  Identities=26%  Similarity=0.387  Sum_probs=225.1

Q ss_pred             EEEEECCCHHHHHHHHHHHHCCCEEEEECCCHHHCCCCHHHCC--EEEECCCCCCCCHHCCHHHHHHHHHHCCCCEEECC
Q ss_conf             6866447099999999888809659998585577187767585--79991899853000698999999987099899458
Q gi|254780268|r    4 KILIANRGEIALRILRACKELGIPTVAVHSTADSGAMHVRLAD--ESVCIGPPSSKDSYLNIQQIVAACEVTGADAIHPG   81 (443)
Q Consensus         4 ~iLianrGeia~riira~~elGi~tv~v~s~~D~~a~~~~~AD--e~~~i~~~~~~~sYldi~~ii~~a~~~~~daihPG   81 (443)
T Consensus         1 ~vGilGGGQLG~M~~~aA~~LG~~~~VL--~~~~~~PA~q~Ad~~~~v~a-------~~~d~~~i~~La~~cDviT~---   68 (386)
T TIGR01161         1 TVGILGGGQLGRMLALAAKKLGIKVAVL--DPDANSPAKQVADSREHVLA-------SFTDPEAIRELAEACDVITF---   68 (386)
T ss_pred             CEEEEECCHHHHHHHHHHHHCCCEEEEE--CCCCCCCCCCCCCCCCEEEE-------EECCHHHHHHHHHHCCEEEE---
T ss_conf             9689718848999999871279589985--48989731112898557998-------51487899999976565543---


Q ss_pred             CCHHHCCHH--HHHHHHHCC--CEEECCCHHHHHHHHCHHHHHHHHHHCCCCCCCCCCCC--CHHHHHHHHHCCCCHHHH
Q ss_conf             531310976--668898459--21626898999872189988776642244332433345--579998732003301220
Q gi|254780268|r   82 YGFLSENAK--FAEILEDHH--IKFIGPSSEHIKIMGDKITAKKTAQQLGIPVVPGSGEV--YPHTAMPIAKEIGFPVLV  155 (443)
Q Consensus        82 yGfLsEn~~--fa~~~e~~G--i~fIGPs~~ai~~~gDK~~~k~~a~~~GVP~~p~~~~~--~~~ea~~~a~~iGyPvii  155 (443)
T Consensus        69 ---E~Ehv~~~~L~~L~~~g~~~~~~-P~~~~l~~~~dk~~qK~~L~~~g~~vp~f~~~~~~~~~~~~~~~~~~g~p~Vl  144 (386)
T TIGR01161        69 ---EFEHVDVEALEKLEARGDKVKVR-PSPEALAIIQDKLTQKQFLQKLGLPVPPFVVIEIKDEEELDSALQELGFPVVL  144 (386)
T ss_pred             ---EECCCCCHHHHHHHHCCCEEEEE-CCHHHHHHHHCHHHHHHHHHHCCCCCCCCCEEECCCHHHHHHHHHHCCCCEEE
T ss_conf             ---10137856789998359847760-38899998836589999999668998841202236842578999873984799


Q ss_pred             HCCCCCC-CCEEEEEEECHHHHHHHHHHHHHHHCCCCCC--CEEEEEEEEEEEECCEEEEEECCCCCCCCCCCCCCCCCC
Q ss_conf             0023457-8216888750668999998754321258998--168844342011033157773478702365665421135
Q gi|254780268|r  156 KASAGGG-GRGMRIAYSENDLSEAIDQARSEALAAFGND--AVYIEKYLENPRHIEVQIFGDGMGNAIHFGERDCSVQRR  232 (443)
Q Consensus       156 Kp~~gGG-G~Gi~vv~~~~el~~a~~~a~~ea~~~fgd~--~vlvEk~i~~~rhiEvqVl~D~~g~~v~l~erdCSiQrr  232 (443)
T Consensus       145 K~~~gGYDGrGq~~i~~~~~~~~~~~~--------~~~~~~~~~~E~fV~F~~Elsv~vaR~~~G~~~~YP~ve-n~~~d  215 (386)
T TIGR01161       145 KARRGGYDGRGQFVIKSEADLPQALKE--------LGDKEEELIVEEFVPFERELSVIVARSADGEIAFYPVVE-NIHQD  215 (386)
T ss_pred             EEEECCCCCCCCEEECCHHHHHHHHHH--------CCCCCEEEEEEECCCCCEEEEEEEEECCCCCEEECCCEE-EEEEC
T ss_conf             842065277310897474328899985--------288840589852356200699999977897488828612-35652


Q ss_pred             --CCEEEEECCCCCCCHHH---HHHHHHHHHHHHHHHCCCCCCEEE-EEE--CCC----CEEEEECCCCCC
Q ss_conf             --62255403445588999---999999999988651543410245-897--288----349982276543
Q gi|254780268|r  233 --NQKIWEEAHSPVISAQD---RTEIGETCVKAMKKIDYRGAGTIE-FLY--ENG----QFYFIEMNTRLQ  291 (443)
Q Consensus       233 --~qkiiEeaPap~l~~~~---~~~i~~~A~~~~~~~g~~g~~tvE-Fl~--~~~----~~yflEvN~Rlq  291 (443)
T Consensus       216 dagIl~~~~aPAPa~p~~~~Q~~~~A~~~A~~~~~~L~~VG~~avE~F~~Pa~dGP~P~~LLvNElAPR~H  286 (386)
T TIGR01161       216 DAGILRLVVAPAPAVPDALVQQQKKAQELARRLAEELDYVGVLAVEMFLLPAKDGPEPDELLVNELAPRPH  286 (386)
T ss_pred             CCCEEEEEEECCCCCCHHHHHHHHHHHHHHHHHHHHCCCEEEEEEEEEEECCCCCCCCCCEEEEEECCCCC
T ss_conf             77877898633777834578999999999999998619617888999830688789512056610257889