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the enzyme catalyzes the fourth reaction of the alpha-aminoadipate pathway for lysine biosynthesis, the conversion of homoisocitrate to alpha-ketoadipate using NAD+ as an oxidizing agent
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in contrast to other homoisicitrate dehydrogenases, the homoisocitrate dehydrogenase from the thermophilic bacterium Thermus thermophilus (TtHICDH) catalyzes the reactions using both homoisocitrate and isocitrate as substrates at similar efficiencies
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Saci_2375 exhibits distinct and similar activities for isocitrate and homoisocitrate, but no detectable activity for 3-isopropylmalate. Saci_2375 is a dual function enzyme serving as isocitrate-homoisocitrate dehydrogenase
