>cd04901 ACT_3PGDH C-terminal ACT (regulatory) domain of D-3-Phosphoglycerate Dehydrogenase (3PGDH) found in fungi and bacteria. The C-terminal ACT (regulatory) domain of D-3-Phosphoglycerate Dehydrogenase (3PGDH) found in fungi and bacteria. 3PGDH is an enzyme that belongs to the D-isomer specific, 2-hydroxyacid dehydrogenase family and catalyzes the oxidation of D-3-phosphoglycerate to 3- phosphohydroxypyruvate, which is the first step in the biosynthesis of L-serine, using NAD+ as the oxidizing agent. In Escherichia coli, the SerA 3PGDH is feedback-controlled by the end product L-serine in an allosteric manner. In the homotetrameric enzyme, the interface at adjacent ACT (regulatory) domains couples to create an extended beta-sheet. Each regulatory interface forms two serine-binding sites. The mechanism by which serine transmits inhibition to the active site is postulated to involve the tethering of the regulatory domains together to create a rigid quaternary structure with a solvent-

Probab=99.81  E-value=6.6e-20  Score=125.82  Aligned_cols=69  Identities=25%  Similarity=0.271  Sum_probs=65.7

Q ss_pred             EEEEEECCCCCHHHHHHHHHHHCCCCEEEEEEECCCCCCEEEEEEEECCCCCHHHHHHHHCCCCEEEEEEE
Q ss_conf             99999828786688999899736996322774214789818999994788998999998649882999999
Q 537021.9.peg.3   25 MICIVNADILGIVVFVGNILGEYGINIAHFHLGRSQSTEHAISFLCIDGSILNSVLEKLSVNVTIRFVKQF   95 (100)
Q Consensus        25 ~L~i~~~D~PG~I~~v~~~L~~~~INIa~m~l~r~~~g~~A~~ii~vD~~i~~~vl~~i~~~~~v~~vr~i   95 (100)
T Consensus         1 Ri~~ih~NvPG~l~~I~~il~~~~iNI~~m~~--~srg~~ay~vidvd~~~~~~~~~~l~~i~gvi~vR~i   69 (69)
T cd04901           1 RILHIHKNVPGVLGQINTILAEHNINIAAQYL--QTRGEIGYVVIDIDSEVSEELLEALRAIPGTIRVRLL   69 (69)
T ss_pred             CEEEEECCCCCHHHHHHHHHHHCCCCHHHHCC--CCCCCEEEEEEEECCCCCHHHHHHHHCCCCEEEEEEC
T ss_conf             96687169886899999999985999799724--2689768999990798989999999729985999769