>cd04922 ACT_AKi-HSDH-ThrA_2 ACT domains of the bifunctional enzyme aspartokinase (AK) - homoserine dehydrogenase (HSDH). This CD includes the second 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 pathwa

Probab=99.72  E-value=2.8e-17  Score=136.19  Aligned_cols=64  Identities=39%  Similarity=0.581  Sum_probs=62.5

Q ss_pred             EEEEEEECCCCCCCCCHHHHHHHHHHHCCCEEEEEE--ECCCEEEEEECHHHHHHHHHHHHHHCCC
Q ss_conf             169999667866785579999999986798299997--0784899997088999999999987097
Q gi|254780873|r  345 LVKISAIGIGMQSYAGVASAFFLCLAEKGINIKAIT--TSEIKISVLIDSAYTELAVRSLHSCYGL  408 (411)
Q Consensus       345 ~a~ISvVG~gm~~~~Giaakif~aL~~~~InI~~is--sSe~~IS~VV~~~d~~~Av~~LH~~F~l  408 (411)
T Consensus         1 la~isvvG~gM~~~~Gvaar~F~aL~~~~INi~mIsQgsSE~sIs~~V~~~d~~~Av~~lh~~Ffl   66 (66)
T cd04922           1 LSILALVGDGMAGTPGVAATFFSALAKANVNIRAIAQGSSERNISAVIDEDDATKALRAVHERFFL   66 (66)
T ss_pred             CEEEEEECCCCCCCCCHHHHHHHHHHHCCCCEEEEECCCCCCEEEEEEEHHHHHHHHHHHHHHHCC
T ss_conf             949999778967895779999999998899789996488732799998089999999999998767