1.3.1.12 L-arogenate + NAD+ - Escherichia coli L-tyrosine + NADH + CO2 - ? 258346 1.3.1.12 L-arogenate + NAD+ - Klebsiella pneumoniae L-tyrosine + NADH + CO2 - ? 258346 1.3.1.12 L-arogenate + NAD+ - Aquifex aeolicus L-tyrosine + NADH + CO2 - ? 258346 1.3.1.12 additional information a dimeric enzyme, with each monomer consisting of an N-terminal alpha/beta dinucleotide-binding domain and a C-terminal alpha-helical dimerization domain. Absence of an alpha/beta motif in HinfPDH that is present in other TyrA proteins. Residues from this motif are involved in discrimination between NADP+ and NAD+. The loop between beta5 and beta6 in the N-terminal domain is much shorter in HinfPDH and an extra helix is present at the C-terminus. Furthermore, HinfPDH adopts a more closed conformation compared with TyrA proteins that do not have tyrosine bound. This conformational change brings the substrate, cofactor and active-site residues into close proximity for catalysis. An ionic network consisting of Arg297, a key residue for tyrosine binding, a water molecule, Asp206, from the loop between beta5 and beta6, and Arg365', from the additional C-terminal helix of the adjacent monomer, is observed that might be involved in gating the active site. Active site structure, overview Haemophilus influenzae ? - ? 89 1.3.1.12 additional information no activity with arogenate Saccharomyces cerevisiae ? - ? 89 1.3.1.12 additional information no activity with arogenate Pleurotus ostreatus ? - ? 89 1.3.1.12 additional information a dimeric enzyme, with each monomer consisting of an N-terminal alpha/beta dinucleotide-binding domain and a C-terminal alpha-helical dimerization domain. Absence of an alpha/beta motif in HinfPDH that is present in other TyrA proteins. Residues from this motif are involved in discrimination between NADP+ and NAD+. The loop between beta5 and beta6 in the N-terminal domain is much shorter in HinfPDH and an extra helix is present at the C-terminus. Furthermore, HinfPDH adopts a more closed conformation compared with TyrA proteins that do not have tyrosine bound. This conformational change brings the substrate, cofactor and active-site residues into close proximity for catalysis. An ionic network consisting of Arg297, a key residue for tyrosine binding, a water molecule, Asp206, from the loop between beta5 and beta6, and Arg365', from the additional C-terminal helix of the adjacent monomer, is observed that might be involved in gating the active site. Active site structure, overview Haemophilus influenzae KW20 ? - ? 89 1.3.1.12 prephenate + NAD+ - Bacillus subtilis 4-hydroxyphenylpyruvate + NADH + CO2 - ? 258345 1.3.1.12 prephenate + NAD+ - Escherichia coli 4-hydroxyphenylpyruvate + NADH + CO2 - ? 258345 1.3.1.12 prephenate + NAD+ - Saccharomyces cerevisiae 4-hydroxyphenylpyruvate + NADH + CO2 - ? 258345