>cd04921 ACT_AKi-HSDH-ThrA-like_1 ACT domains of the bifunctional enzyme aspartokinase (AK) - homoserine dehydrogenase (HSDH). This CD includes the first of two ACT domains of the bifunctional enzyme aspartokinase (AK) - homoserine dehydrogenase (HSDH). The ACT domains are positioned between the N-terminal catalytic domain of AK and the C-terminal HSDH domain found in bacteria (Escherichia coli (EC) ThrA) and higher plants (Zea 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. HSDH is the first committed reaction in the branch of the pathway that leads to Thr and Met. 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 pat

Probab=99.67  E-value=1.8e-16  Score=130.83  Aligned_cols=67  Identities=31%  Similarity=0.530  Sum_probs=64.3

Q ss_pred             EEEEEEECCCCCCCCCHHHHHHHHHHHCCCEEEEEE--ECCCEEEEEECHHHHHHHHHHHHHHCCCCCC
Q ss_conf             169999667866785579999999986798299997--0784899997088999999999987097779
Q gi|254780873|r  345 LVKISAIGIGMQSYAGVASAFFLCLAEKGINIKAIT--TSEIKISVLIDSAYTELAVRSLHSCYGLDVQ  411 (411)
Q Consensus       345 ~a~ISvVG~gm~~~~Giaakif~aL~~~~InI~~is--sSe~~IS~VV~~~d~~~Av~~LH~~F~ld~~  411 (411)
T Consensus         1 valv~vvG~gm~~~~GvaariF~~La~~~INI~mIsQ~sSE~sIs~vV~~~d~~~Av~aL~~~F~le~~   69 (80)
T cd04921           1 VALINIEGTGMVGVPGIAARIFSALARAGINVILISQASSEHSISFVVDESDADKALEALEEEFALEIK   69 (80)
T ss_pred             CEEEEEECCCCCCCCCHHHHHHHHHHHCCCCEEEEECCCCCCEEEEEECHHHHHHHHHHHHHHHHHHHH
T ss_conf             979999788968997489999999998799789997378765699998189999999999999998997