>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=374.74 Aligned_cols=377 Identities=23% Similarity=0.339 Sum_probs=284.3 Q ss_pred HHHHHHC----CCEEEEEC-CCCC--CCCCCCCCCCCCCEEEECCHHHHHHHHHHHHHCCCCCCEEEEEEEECCCEEHHH Q ss_conf 9999985----98899984-7322--333432234797099979989999999999827620022456543065200012 Q gi|254781102|r 60 IPQAIAQ----GAEAIVVS-SAYS--LQDFSATIRSNTPILVVDNTRKFLSLFASRLYGKHPENILAVTGTSGKSSVASF 132 (497) Q Consensus 60 i~~A~~~----GA~~~i~~-~~~~--~~~~~~~~~~~~p~i~V~d~~~aL~~la~~~~~~~~~~vIgITGTnGKTTt~~~ 132 (497) T Consensus 54 ~~~n~~~~p~g~~~vVv~S~~Ai~~~NpEi~~A~~~~IPv~~---R~~~Lael~~~~----k-~~iaVaGtHGKTTTTam 125 (491) T TIGR01082 54 SAENLDDLPTGAADVVVVSAAAIKEDNPEIVEAKERGIPVIR---RAEMLAELMRKR----K-ESIAVAGTHGKTTTTAM 125 (491) T ss_pred CHHHHCCCCCCCCCEEEEEEECCCCCCHHHHHHHHCCCCEEC---HHHHHHHHHHHH----C-CEEEEECCCCCHHHHHH T ss_conf 779820367897437998640337888889999964888133---789999998620----8-70799836872568999 Q ss_pred HHHHHHHCCC-CCCCCCCCCCCCCCCCCCCCCCCCHHHHHHHHHHHCCCC-CCCCCCCC--CHHHHHHHHHCCCCCCCCC Q ss_conf 3333321023-222223454433235544576753122111111101122-33333566--7666555431043212111 Q gi|254781102|r 133 VQQICQRSGL-SSFQIGPTSTISSFAQDNRLTTPSPIYLAKALSYLSSQG-VTHVSVEA--SSHGLDQHRLDGIKLIAGS 208 (497) Q Consensus 133 l~~iL~~~g~-~~~~~g~~~~~~~~~~~~~~TtP~~~~l~~~l~~~~~~g-~~~~vlEv--SS~gl~~~rl~~i~~diav 208 (497) T Consensus 126 ia~~~~~aGLdPt~~~G--G~~~~~~~Na~~-----------------g~~~~~lvaEaDESd~~---~sFl~~~P~~ai 183 (491) T TIGR01082 126 IAVILKEAGLDPTVIVG--GEVKEAGTNARL-----------------GSSGEYLVAEADESDRS---ASFLHLQPEVAI 183 (491) T ss_pred HHHHHHHCCCCCCEEEC--CCCCCCCCCEEE-----------------CCCCCEEEEEEEECCCC---CCHHCCCCCEEE T ss_conf 99999844999768986--643665774357-----------------14686799998723776---401206985799 Q ss_pred CCCCCCCCCC--CCCHHHHHHHHHHHHHHHCCCCCCCCCCCCCCCCHHHHHHHCCCC-CCCCCCCCCC--CCCCCCCEEC Q ss_conf 2321545543--211011223455421000000122321112542000122210235-6532222233--3322000000 Q gi|254781102|r 209 FTNLGRDHID--YHQTQQAYFNAKMRLFEELLPKESPAIIYADDAYSKEVMKRAHNA-GCRVLSVGYQ--GKFIHLKKVC 283 (497) Q Consensus 209 iTNI~~dHLd--~~gs~e~y~~aK~~If~~~~~~~~~~ViN~Dd~~~~~l~~~~~~~-~~~~~~~g~~--~~~~~~~~~~ 283 (497) T Consensus 184 ~TNie~DH~D~tY~~~~E~~~~aF~~F~~-~l~~~G~~v~c~DD~~~~~l~~~~~~~r~d~~~~y~~~~~~~~~~~~~~~ 262 (491) T TIGR01082 184 VTNIEPDHLDNTYGSSLERLKAAFEKFIH-NLPFYGLAVICADDPVLRKLVPKATESRKDVVITYGGSGEDADIRAENIQ 262 (491) T ss_pred ECCCCCCCCCCCCCCCHHHHHHHHHHHHH-HCCCCCEEEEECCCHHHHHHHHHHHHCCCEEEEECCCCCCCCEEEEEEEE T ss_conf 74777434776664578999999999998-27888799998386547877635553387047866877764147788743 Q ss_pred CCCCCCCCCCCCCCC--------EEECCCCCCCCCCCCHHHHHHHHHHHCCCCH---------HHHHHHHHHHHHHHHHH Q ss_conf 145444321122210--------0101223433222110577888775202676---------76311123443345521 Q gi|254781102|r 284 AIHNKQQVTISVEGK--------DFDFLFPLPGEFQVYNALVAAGLCIAIGIDS---------ALVLEHLEKLHVVPGRF 346 (497) Q Consensus 284 ~~~~~~~~~i~~~~~--------~~~~~l~l~G~hni~NalaAia~a~~lGi~~---------~~i~~~L~~f~~~~gR~ 346 (497) T Consensus 263 ~~~~~~~f~v~~~~~~~~~~~~G~~~~~~~~pG~HNvLNAlAA~ava~~~g~~~~G~~~~~~~~~I~~~L~~F~G~~RRf 342 (491) T TIGR01082 263 QSGAEFEFSVRLKGKLGEATTEGPLEFKLNLPGRHNVLNALAAIAVALELGLDFYGKVIVDFLEAIKRALANFQGVKRRF 342 (491) T ss_pred ECCCEEEEEEEECCCCCCCEEEEEEEEEEECCCCCCHHHHHHHHHHHHHHCCCCCCCEEEEHHHHHHHHHHCCCCCCHHH T ss_conf 22645899999704522011100279998038720067899999888872212368556415899999985068973101 Q ss_pred CCCCCCCCC-----CEEEECCCCCHHHHHHHHHHHHHCC---CCCCCEEEECCCCCCCCHH----HHHHHHHHHHCCEEE Q ss_conf 000135578-----6023000378689999741211002---3444035402665460046----899999986198999 Q gi|254781102|r 347 EFVGTNSRG-----GRIYVDYAHTSNSLEMILKNIRTIT---SGRIIVVFGCGGDRDQGKR----PIMGKIALDLADIAI 414 (497) Q Consensus 347 E~i~~~~~~-----~~viiDyahNP~s~~~aL~~l~~~~---~~r~i~V~G~~Gdrd~~kr----~~mg~~a~~~ad~vi 414 (497) T Consensus 343 ~~~g~~~~~~n~g~~~~~DDYAHHPtEi~aTl~aAr~~~~~k~~r~v~~F-QPH-r-YsRT~~~~~~F~~~L~~haD~l~ 419 (491) T TIGR01082 343 EILGECNGGNNNGTVLLIDDYAHHPTEIKATLAAARQVYPDKNRRIVVVF-QPH-R-YSRTKDLFDDFAKVLSDHADELI 419 (491) T ss_pred HHHHHCCCCCCCCEEEEEECCCCCHHHHHHHHHHHHHHHCCCCCEEEEEE-CCC-C-HHHHHHHHHHHHHHHHHCCCEEE T ss_conf 20100278987527999965899978999999999875211795799997-498-5-67899889999999973089999 Q ss_pred ECCCCCC------CCCHHHHHHHHHHCC--CCEEEECCHHHHHHHHHHHCCCCCEEEEECCCCC Q ss_conf 9088798------989899999998347--9809978989999999996589889999446886 Q gi|254781102|r 415 VTDDNPR------SEDPEKIRAEIIHGI--PGFIEKGNRIEAIRTAIEMLNKQDVLVVAGKGHE 470 (497) Q Consensus 415 ~t~d~~r------~e~~~~I~~~i~~g~--~~~~~~~dr~eAi~~A~~~a~~gDvili~GkG~e 470 (497) T Consensus 420 ~~diY~A~E~~~~g~~~~~l~~~~~~~~~~~~~~f~~~~~~~~~~l~~~~~~GD~~~~~GAG~~ 483 (491) T TIGR01082 420 LLDIYAAGEEPIAGIDGKSLARKITQKKGKEEPYFVPDLAEVVEFLAEVLQSGDLILTMGAGDV 483 (491) T ss_pred EECCCCCCCCCCCCCCHHHHHHHHHHCCCCCCCCCCCHHHHHHHHHHHHCCCCCEEEEECCCCH T ss_conf 8153211367767877899999986257877761042177899999997169989999605520

HHsearch alignment for GI: 254781102 and conserved domain: TIGR01082