>TIGR01082 murC UDP-N-acetylmuramate--alanine ligase; InterPro: IPR005758 The bacterial cell wall provides strength and rigidity to counteract internal osmotic pressure, and protection against the environment. The peptidoglycan layer gives the cell wall its strength, and helps maintain the overall shape of the cell. The basic peptidoglycan structure of both Gram-positive and Gram-negative bacteria is comprised of a sheet of glycan chains connected by short cross-linking polypeptides. Biosynthesis of peptidoglycan is a multi-step (11-12 steps) process comprising three main stages: (1) formation of UDP-N-acetylmuramic acid (UDPMurNAc) from N-acetylglucosamine (GlcNAc). (2) addition of a short polypeptide chain to the UDPMurNAc. (3) addition of a second GlcNAc to the disaccharide-pentapeptide building block and transport of this unit through the cytoplasmic membrane and incorporation into the growing peptidoglycan layer. Stage two involves four key Mur ligase enzymes: MurC (6.3.2.8 from EC) , MurD (6.3.2.9 from EC) , MurE (6.3.2.13 from EC) and MurF (6.3.2.10 from EC) . These four Mur ligases are responsible for the successive additions of L-alanine, D-glutamate, meso-diaminopimelate or L-lysine, and D-alanyl-D-alanine to UDP-N-acetylmuramic acid. All four Mur ligases are topologically similar to one another, even though they display low sequence identity. They are each composed of three domains: an N-terminal Rossmann-fold domain responsible for binding the UDPMurNAc substrate; a central domain (similar to ATP-binding domains of several ATPases and GTPases); and a C-terminal domain (similar to dihydrofolate reductase fold) that appears to be associated with binding the incoming amino acid. The conserved sequence motifs found in the four Mur enzymes also map to other members of the Mur ligase family, including folylpolyglutamate synthetase, cyanophycin synthetase and the capB enzyme from Bacillales . This entry represents UDP-N-acetylmuramate-alanine ligase (MurC). MurC is an essential, cytoplasmic peptidoglycan biosynthetic enzyme, catalyzes the ATP-dependent ligation of L-alanine (Ala) and UDP-N-acetylmuramic acid (UNAM) to form UDP-N-acetylmuramyl-L-alanine (UNAM-Ala). The enzyme is a nonribosomal peptide ligase which utilises ATP to form an amide bond between L-alanine and UNAM.1 Mechanistic studies on the Escherichia coli MurC enzyme using oxygen isotope analyses demonstrated that the enzyme-catalyzed reaction proceeds through an acyl phosphate UNAM intermediate prior to L-alanine addition.; GO: 0005524 ATP binding, 0008763 UDP-N-acetylmuramate-L-alanine ligase activity, 0008360 regulation of cell shape, 0009252 peptidoglycan biosynthetic process, 0009273 peptidoglycan-based cell wall biogenesis, 0051301 cell division, 0005737 cytoplasm.

Probab=100.00 E-value=0 Score=347.19 Aligned_cols=412 Identities=23% Similarity=0.301 Sum_probs=290.2 Q ss_pred HHHHHHHHCCEEECCCCCCEEEEEEEECCCCCCCCEEEECCCCCCCHHHHHHHHHHC----CCEEEEEC-CCCCCC---- Q ss_conf 788998727999526887147467740222378988897168874768889999986----98899985-521245---- Q gi|254781101|r 7 FHDLLQAIQGHSIGIVPQGFVNGISIDSRSIAPQEAFFAIKGPHYDGHDFILHAVQK----GAGLVVVN-TDMVAS---- 77 (472) Q Consensus 7 ~~~l~~~~~g~~~~~~~~~~i~~i~~dSr~v~~g~lFval~g~~~DGh~~i~~A~~~----Ga~~~i~~-~~~~~~---- 77 (472) T Consensus 15 lA~~L~~~G~~VsG-S-D--~~~~~y~t~~L~~~Gi~I~~------g-~h~~~n~~~~p~g~~~vVv~S~~Ai~~~NpEi 83 (491) T TIGR01082 15 LAEILLNRGYKVSG-S-D--IAENAYTTKRLEALGIKIYI------G-EHSAENLDDLPTGAADVVVVSAAAIKEDNPEI 83 (491) T ss_pred HHHHHHHCCCCEEE-E-E--CCCCCCHHHHHHHCCCEECC------C-CCCHHHHCCCCCCCCCEEEEEEECCCCCCHHH T ss_conf 99999857890877-2-0--33563158999867876627------9-96779820367897437998640337888889 Q ss_pred --CCCCCCCEEEECCHHHHHHHHHHHHHHCCCCCEEEEECCCCCCHHHHHHHHHHHHHHC--CCCCHHHHHCCCCCCCHH Q ss_conf --5446972899599899999999999830699399983036542012334677775201--122212211014574100 Q gi|254781101|r 78 --IGSLSIPVFGVDDVLGALNKLAVAARLRSKATIIAITGSVGKTTTKEMLTIALSSIKK--TYACIGSYNNHIGVPLTL 153 (472) Q Consensus 78 --~~~~~~~~i~v~d~~~al~~la~~~~~~~~~~vI~ITGTnGKTTt~~~l~~iL~~~~~--~~~t~gn~Nn~iGvpltl 153 (472) T Consensus 84 ~~A~~~~IPv~~R---~~~Lael~---~~~-k-~~iaVaGtHGKTTTTamia~~~~~aGLdPt~~~GG~~~~-~~---~N 151 (491) T TIGR01082 84 VEAKERGIPVIRR---AEMLAELM---RKR-K-ESIAVAGTHGKTTTTAMIAVILKEAGLDPTVIVGGEVKE-AG---TN 151 (491) T ss_pred HHHHHCCCCEECH---HHHHHHHH---HHH-C-CEEEEECCCCCHHHHHHHHHHHHHCCCCCCEEECCCCCC-CC---CC T ss_conf 9999648881337---89999998---620-8-707998368725689999999984499976898664366-57---74 Q ss_pred CCCCCCCHHHHHCCCCCCCCCCCCCCCCCCCCEEEEEEECCCHHH--HHHHHHHHHHHHHHHCCCCCCCCHHHHCCCCHH Q ss_conf 012322144430156644332112122323220255531210123--444578888654331037622101210134246 Q gi|254781101|r 154 ARMPVDVDFGIFELGMSHLGEIRFLTHLVRPHIAVITTIAPAHLS--NFSGIEEIASAKAEIFEGLEKTGTIFLNYDDSF 231 (472) Q Consensus 154 l~~~~~~~~~V~E~g~~~~gei~~L~~i~~P~iaiiTNI~~dHld--~~~s~e~i~~~K~~i~~~l~~~g~~ViN~Dd~~ 231 (472) T Consensus 152 a~~g~~~~~lvaEaDESd~~---~sFl~~~P~~ai~TNie~DH~D~tY~~~~E~~~~aF~~F~~~l~~~G~~v~c~DD~~ 228 (491) T TIGR01082 152 ARLGSSGEYLVAEADESDRS---ASFLHLQPEVAIVTNIEPDHLDNTYGSSLERLKAAFEKFIHNLPFYGLAVICADDPV 228 (491) T ss_pred EEECCCCCEEEEEEEECCCC---CCHHCCCCCEEEECCCCCCCCCCCCCCCHHHHHHHHHHHHHHCCCCCEEEEECCCHH T ss_conf 35714686799998723776---401206985799747774347766645789999999999982788879999838654 Q ss_pred HHHHHHHCCCCCCCCCCCCCCC-CCCCCCCCCCCCCCCCCCCCCCCCCC--------CCCCCCCCCCCCCCCCCCCHHHH Q ss_conf 8998752012333332222222-22222234421134651001245654--------32212222222233332210356 Q gi|254781101|r 232 FELLKAKSHALGIKTIYSFGKS-KNADFQLRKWKQCSEQSWMEVQLQGK--------SMEVVHHGIGYHMAQNMLMTLGI 302 (472) Q Consensus 232 ~~~l~~~~~~~~~~~i~~~g~~-~~ad~~~~~i~~~~~~~~~~~~~~~~--------~~~~~l~~~G~hnv~NalaAia~ 302 (472) T Consensus 229 ~~~l~~~~~~~r~d~~~~y~~~~~~~~~~~~~~~~~~~~~~f~v~~~~~~~~~~~~G~~~~~~~~pG~HNvLNAlAA~av 308 (491) T TIGR01082 229 LRKLVPKATESRKDVVITYGGSGEDADIRAENIQQSGAEFEFSVRLKGKLGEATTEGPLEFKLNLPGRHNVLNALAAIAV 308 (491) T ss_pred HHHHHHHHHHCCCEEEEECCCCCCCCEEEEEEEEECCCEEEEEEEECCCCCCCEEEEEEEEEEECCCCCCHHHHHHHHHH T ss_conf 78776355533870478668777641477887432264589999970452201110027999803872006789999988 Q ss_pred HHHHCCCC---------HHHHHHHHCCCCCCCCCCCCEECCCCCC------EEEEEECCCCCCCCHHHHHHHHHHHHHCC Q ss_conf 76510121---------0345543114766443310100036531------13310002565321012577787411102 Q gi|254781101|r 303 VSILTADV---------DTAIKALSVFHPKEGRGKRYRCALNQGF------FTLIDESYNANPASMKAAISVLSQISPHG 367 (472) Q Consensus 303 ~~~lGi~~---------~~i~~~L~~~~~~~GR~~~~~~~~~~~~------~~iIDDsYNAnP~S~~aal~~l~~~~~~~ 367 (472) T Consensus 309 a~~~g~~~~G~~~~~~~~~I~~~L~~F~G~~RRf~~~---g~~~~~~n~g~~~~~DD-YAHHPtEi~aTl~aAr~~~~~k 384 (491) T TIGR01082 309 ALELGLDFYGKVIVDFLEAIKRALANFQGVKRRFEIL---GECNGGNNNGTVLLIDD-YAHHPTEIKATLAAARQVYPDK 384 (491) T ss_pred HHHHCCCCCCCEEEEHHHHHHHHHHCCCCCCHHHHHH---HHCCCCCCCCEEEEEEC-CCCCHHHHHHHHHHHHHHHCCC T ss_conf 8872212368556415899999985068973101201---00278987527999965-8999789999999998752117 Q ss_pred CCCCEEEECCHHHCCCCHHHHHHHHHHHHHHCC-CCEEEEE-----------CCCHHHHHHHCCC---CCCEEEECCHHH Q ss_conf 687138851235417105899999999998649-9899998-----------8038989985113---797999789899 Q gi|254781101|r 368 EGRRIAVLGDMCEMGELSQSFHIDLAEVLSLYN-ISHVWLS-----------GFHVLALKDALPR---SIHVHYSETMDG 432 (472) Q Consensus 368 ~~r~i~VlG~m~ELG~~~~~~h~~i~~~~~~~~-~d~v~~~-----------G~~~~~~~~~~~~---~~~~~~~~~~e~ 432 (472) T Consensus 385 ~~r~v~~FQPH--rYsRT~~~~~~F~~~L~--~haD~l~~~diY~A~E~~~~g~~~~~l~~~~~~~~~~~~~~f~~~~~~ 460 (491) T TIGR01082 385 NRRIVVVFQPH--RYSRTKDLFDDFAKVLS--DHADELILLDIYAAGEEPIAGIDGKSLARKITQKKGKEEPYFVPDLAE 460 (491) T ss_pred CCEEEEEECCC--CHHHHHHHHHHHHHHHH--HCCCEEEEECCCCCCCCCCCCCCHHHHHHHHHHCCCCCCCCCCCHHHH T ss_conf 95799997498--56789988999999997--308999981532113677678778999999862578777610421778 Q ss_pred HHHHHHHHCCCCCEEEEECC Q ss_conf 99999984478989999771 Q gi|254781101|r 433 LFLFIQSSLVDGDVVVVKSS 452 (472) Q Consensus 433 a~~~l~~~~~~gdiVLiKGS 452 (472) T Consensus 461 ~~~~l~~~~~~GD~~~~~GA 480 (491) T TIGR01082 461 VVEFLAEVLQSGDLILTMGA 480 (491) T ss_pred HHHHHHHHCCCCCEEEEECC T ss_conf 99999997169989999605

HHsearch alignment for GI: 254781101 and conserved domain: TIGR01082