>cd04878 ACT_AHAS N-terminal ACT domain of the Escherichia coli IlvH-like regulatory subunit of acetohydroxyacid synthase (AHAS). ACT_AHAS: N-terminal ACT domain of the Escherichia coli IlvH-like regulatory subunit of acetohydroxyacid synthase (AHAS). AHAS catalyses the first common step in the biosynthesis of the three branched-chain amino acids. The first step involves the condensation of either pyruvate or 2-ketobutyrate with the two-carbon hydroxyethyl fragment derived from another pyruvate molecule, covalently bound to the coenzyme thiamine diphosphate. Bacterial AHASs generally consist of regulatory and catalytic subunits. The effector (valine) binding sites are proposed to be located in two symmetrically related positions in the interface between a pair of N-terminal ACT domains with the C-terminal domain of IlvH contacting the catalytic dimer. Plants Arabidopsis and Oryza have tandem IlvH subunits; both the first and second ACT domain sequences are present in this CD. Members of

Probab=98.42  E-value=1.8e-06  Score=55.05  Aligned_cols=70  Identities=13%  Similarity=0.330  Sum_probs=58.6

Q ss_pred             CEEEEEECCCCCHHHHHHHHHHHCCCCEEEEEEECCCCCCEEEEEEEECCC--CCHHHHHHHHCCCCEEEEE
Q ss_conf             399999828786688999899736996322774214789818999994788--9989999986498829999
Q 537021.9.peg.3   24 LMICIVNADILGIVVFVGNILGEYGINIAHFHLGRSQSTEHAISFLCIDGS--ILNSVLEKLSVNVTIRFVK   93 (100)
Q Consensus        24 ~~L~i~~~D~PG~I~~v~~~L~~~~INIa~m~l~r~~~g~~A~~ii~vD~~--i~~~vl~~i~~~~~v~~vr   93 (100)
T Consensus         1 htisvlveN~pGvL~Rit~lF~rRg~NI~Sl~v~~te~~~~sR~tivv~~~~~~i~qi~kQL~KlidVi~V~   72 (72)
T cd04878           1 HTLSVLVENEPGVLNRISGLFARRGFNIESLTVGPTEDPGISRITIVVEGDDDVIEQIVKQLNKLVDVLKVS   72 (72)
T ss_pred             CEEEEEEECCCCHHHHHHHHHHHCCCCEEEEEEEECCCCCEEEEEEEEECCHHHHHHHHHHHHCCCCEEEEC
T ss_conf             979999977878999999998607855678998613799848999999788899999999985776879959