This family includes members of 3-dehydroquinate synthase II (EC:1.4.1.24), encoded by aroB genes in M. maripaludis which is widely distributed in methanogens. In M. jannaschii, proteins ADTH synthase (AroA) and DHQ synthase II (AroB) are required to convert 6-deoxy-5-ketofructose-1-phosphate (DKFP) and aspartate semialdehyde to 3-dehydroquinate (DHQ) in vitro [1, 2].

1: Biochemical and genetic characterization of an early step in a novel pathway for the biosynthesis of aromatic amino acids and p-aminobenzoic acid in the archaeon Methanococcus maripaludis. Porat I, Sieprawska-Lupa M, Teng Q, Bohanon FJ, White RH, Whitman WB; Mol Microbiol. 2006;62:1117-1131. PMID:17010158

2: L-Aspartate semialdehyde and a 6-deoxy-5-ketohexose 1-phosphate are the precursors to the aromatic amino acids in Methanocaldococcus jannaschii. White RH; Biochemistry. 2004;43:7618-7627. PMID:15182204