>TIGR00169 leuB 3-isopropylmalate dehydrogenase; InterPro: IPR004429 Several NAD- or NADP-dependent dehydrogenases, including 3-isopropylmalate dehydrogenase, tartrate dehydrogenase, and the dimeric forms of isocitrate dehydrogenase, share a nucleotide binding domain unrelated to that of lactate dehydrogenase and its homologs. These enzymes dehydrogenate their substates at a H-C-OH site adjacent to a H-C-COOH site; the latter carbon, now adjacent to a carbonyl group, readily decarboxylates. Among these decarboxylating dehydrogenases of hydroxyacids, overall sequence homology indicates evolutionary history rather than actual substrate or cofactor specifity, which may be toggled experimentally by replacement of just a few amino acids. 3-isopropylmalate dehydrogenase is an NAD-dependent enzyme and should have a sequence resembling HGSAPDI around residue 340. The subtrate binding loop should include a sequence resembling E[KQR]X(0,1)LLXXR around residue 115.; GO: 0003862 3-isopropylmalate dehydrogenase activity, 0009098 leucine biosynthetic process, 0005737 cytoplasm.

Probab=93.47  E-value=0.067  Score=31.79  Aligned_cols=55  Identities=22%  Similarity=0.332  Sum_probs=35.6

Q ss_pred             HHHHHHHHCCCCEEEEEEECCEEEECCCCCCCHHHCCCCCCCHHHHHHHHHHHHHHHH
Q ss_conf             2255554144772799920876475588755222133686683899999999999998
Q gi|254780397|r  276 ALIPIKTLDFNQTVNITLGLPFVRTSPDHGTAFDIAGSSLTQEESLVSALKIAAQLGY  333 (343)
Q Consensus       276 glip~K~l~f~~~Vn~t~GLp~irtSpdHGTafdiagk~~a~~~s~~~ai~~a~~~~~  333 (343)
T Consensus       267 GmLPSASL~~~~~K~-~~g--~~L~EP~HGSAPDIAGkgiANP~A~ILSAAMlLry~f  321 (370)
T TIGR00169       267 GMLPSASLGSLVDKE-EDG--FGLFEPVHGSAPDIAGKGIANPIAQILSAAMLLRYSF  321 (370)
T ss_pred             HHHHHHHHCCCCCCC-CCC--CEECCCCCCCCCCCCCCCCCCHHHHHHHHHHHHHHHC
T ss_conf             323455431457654-556--5001678888873035788656899999999998507