>cd04257 AAK_AK-HSDH AAK_AK-HSDH: Amino Acid Kinase Superfamily (AAK), AK-HSDH; this CD includes the N-terminal catalytic domain of aspartokinase (AK) of the bifunctional enzyme AK - homoserine dehydrogenase (HSDH). These aspartokinases are found in bacteria (E. coli AKI-HSDHI, ThrA and E. coli AKII-HSDHII, MetL) and higher plants (Z. mays AK-HSDH). AK and HSDH are the first and third enzymes in the biosynthetic pathway of the aspartate family of amino acids. AK catalyzes the phosphorylation of Asp to P-aspartyl phosphate. HSDH catalyzes the NADPH-dependent conversion of Asp 3-semialdehyde to homoserine. ThrA and MetL are involved in threonine and methionine biosynthesis, respectively. In E. coli, ThrA is subject to allosteric regulation by the end product L-threonine and the native enzyme is reported to be tetrameric. As with bacteria, plant AK and HSDH are feedback inhibited by pathway end products. Maize AK-HSDH is a Thr-sensitive 180-kD enzyme. Arabidopsis AK-HSDH is an alanine-act

Probab=100.00 E-value=3.5e-33 Score=224.24 Aligned_cols=214 Identities=24% Similarity=0.263 Sum_probs=153.9 Q ss_pred EEEEEEEEEECCCCCCCCHHHHHHHHHHHHHHHHCCCEEEEEECCCC--CHHHHHHHC---C------------------ Q ss_conf 99940036853887770899999999999999976990999823654--102334420---3------------------ Q gi|254780777|r 10 LLKVSGEALAGISGFGVDIDSVNRICADIAEVYAKGIEIGIVVGGGN--IFRGSQVVA---E------------------ 66 (242) Q Consensus 10 ViKiGGSsL~~~~~~~~~~~~i~~ia~~I~~~~~~g~~vviV~sg~~--~~~~~~~~~---~------------------ 66 (242) T Consensus 3 V~KFGGtSv~~-------~~~i~~v~~iI~~~~~~~-~~vVVVSA~ggvTd~L~~~~~~a~~~~~~~~~~l~~i~~~h~~ 74 (294) T cd04257 3 VLKFGGTSLAN-------AERIRRVADIILNAAKQE-QVAVVVSAPGKVTDLLLELAELASSGDDAYEDILQELESKHLD 74 (294) T ss_pred EEEECCCCCCC-------HHHHHHHHHHHHHHCCCC-CEEEEECCCCCCHHHHHHHHHHHHCCCHHHHHHHHHHHHHHHH T ss_conf 99878111589-------999999999997532489-9899980999867999999999853862689999999999999 Q ss_pred ---------------------------------CCCCCCHHHHHHHHHHHHHHHHHHHHHHHHHHCCCCCCCCCCHHHHH Q ss_conf ---------------------------------77775402467888889899999999999761886411340010024 Q gi|254780777|r 67 ---------------------------------NYLLCERSTVDSMGMLSTVINALALDLALRKINVPTVILSSIFMPQV 113 (242) Q Consensus 67 ---------------------------------~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 113 (242) T Consensus 75 ~i~~l~~~~~~~~~~~~i~~~~~~l~~~l~~~~~~~~~~~~~~d~i~s~GE~lSa~l~a~~L~~~Gi~a~~ld~~~~i~t 154 (294) T cd04257 75 LITELLSGDAAAELLSALGNDLEELKDLLEGIYLLGELPDSIRAKVLSFGERLSARLLSALLNQQGLDAAWIDARELIVT 154 (294) T ss_pred HHHHHCCCHHHHHHHHHHHHHHHHHHHHHHHHHHCCCCCHHHHHHHHHHHHHHHHHHHHHHHHHCCCCCEEECHHHHEEC T ss_conf 99985350457899999999999999999777641569889999999989899999999999977998299533362112 Q ss_pred H----------HHHHHHHHCCHHHHCCCCCCCCCC---------CCCCCCCHHHHHHHHHHHCHHHHHHCCCCCCCCCCC Q ss_conf 5----------665432100001100111112465---------567776215788888641644665147543512343 Q gi|254780777|r 114 C----------EVFSCRNAVSYLSQGKVVIFSGGT---------GNAFLTTDSAAALRASEIGADVILKGTQVDGVYSAD 174 (242) Q Consensus 114 ~----------~~~~~~~~~~~~~~~~~~~~~~~~---------~~~~~~~D~~a~~ia~~~~ad~l~i~tdvdGiyt~d 174 (242) T Consensus 155 ~~~~~~a~~~~~~t~~~~~~~~~~~~~v~Vv~GFig~~~~G~~ttLGRgGSD~TAa~ia~~L~A~~v~IwtDV~Gi~taD 234 (294) T cd04257 155 DGGYLNAVVDIELSKERIKAWFSSNGKVIVVTGFIASNPQGETTTLGRNGSDYSAAILAALLDADQVEIWTDVDGVYSAD 234 (294) T ss_pred CCCCCCEEECHHHHHHHHHHHHHCCCCEEEECCCCCCCCCCCEEEECCCCHHHHHHHHHHHCCCCEEEEECCCCCCCCCC T ss_conf 68877535668651999999864179789976952567889751348994889999999972997899942888505279 Q ss_pred CCCCCCCCCCCCCCHHHHHHC---CCCCCCHHHHHHHHHCCCCEEEEECCCCCHHHHHHCCCCCCCEEC Q ss_conf 223444444441159999855---998140999999997499699951898547999977998782466 Q gi|254780777|r 175 PRVHASSTRFDSLTYNQFIEK---GLKVMDCASVVLARDCSIPIIVFSIHSPGGIWGGLSGIGRSTIIS 240 (242) Q Consensus 175 P~~~~~ak~i~~is~~e~l~~---G~~v~~~~A~~~a~~~gI~v~I~ng~~~~~i~~~l~Ge~~GT~I~ 240 (242) T Consensus 235 Pr~v~~a~~i~~lsy~EA~eLa~~GakVlHp~ti~p~~~~~Ipi~vrnt~~p---------~~~GT~IS 294 (294) T cd04257 235 PRKVKDARLLPSLSYQEAMELSYFGAKVLHPKTIQPVAKKNIPILIKNTFNP---------EAPGTLIS 294 (294) T ss_pred CCCCCCCEECCCCCHHHHHHHHHCCCCCCCHHHHHHHHHCCCCEEEECCCCC---------CCCCEEEC T ss_conf 9768898671604899999999679831599999999987993899389998---------99981519

HHsearch alignment for GI: 254780777 and conserved domain: cd04257