>gnl|CDD|58623 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-activated, threonine-sensitive enzyme whose ACT domains, located C-terminal to the AK catalytic domain, were shown to be involved in allosteric activation.. Length = 294

 Score = 47.5 bits (113), Expect = 4e-06
 Identities = 35/111 (31%), Positives = 55/111 (49%), Gaps = 12/111 (10%)

Query: 125 YLSQGKVVI---FSGGTGNAFLTT------DSAAALRASEIGADVILKGTQVDGVYSADP 175
           + S GKV++   F         TT      D +AA+ A+ + AD +   T VDGVYSADP
Sbjct: 176 FSSNGKVIVVTGFIASNPQGETTTLGRNGSDYSAAILAALLDADQVEIWTDVDGVYSADP 235

Query: 176 RVHASSTRFDSLTYNQFIEK---GLKVMDCASVVLARDCSIPIIVFSIHSP 223
           R    +    SL+Y + +E    G KV+   ++      +IPI++ +  +P
Sbjct: 236 RKVKDARLLPSLSYQEAMELSYFGAKVLHPKTIQPVAKKNIPILIKNTFNP 286