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Histidinol dehydrogenase, HisD, E.C 1.1.1.23. Histidinol dehydrogenase catalyzes the last two steps in the L-histidine biosynthesis pathway, which is conserved in bacteria, archaea, fungi, and plants. These last two steps are (i) the NAD-dependent oxidation of L-histidinol to L-histidinaldehyde, and (ii) the NAD-dependent oxidation of L-histidinaldehyde to L-histidine. In most fungi and in the unicellular choanoflagellate Monosiga bevicollis, the HisD domain is fused with units that catalyze the second and third biosynthesis steps in this same pathway.
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Jiyao W et al.(2023). "The conserved domain database in 2023.",