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In bacteria and plants, dihydrodipicolinate synthase (DHDPS) plays a key role in the (S)-lysine biosynthesis pathway. DHDPS catalyzes the first step of the condensation of (S)-aspartate-β-semialdehyde and pyruvate to form an unstable compound, (4S)-4-hydroxy-2,3,4,5-tetrahydro-(2S)-dipicolinic acid. The activity of DHDPS is allosterically regulated by (S)-lysine, a feedback inhibitor. The crystal structure of DHDPS from Methanocaldococcus jannaschii (MjDHDPS) was solved by the molecular-replacement method and was refined to 2.2 Å resolution. The structure revealed that MjDHDPS forms a functional homo­tetramer, as also observed in Escherichia coli DHDPS, Thermotoga maritima DHDPS and Bacillus anthracis DHDPS. The binding-site region of MjDHDPS is essentially similar to those found in other known DHDPS structures.

Supporting information

PDB reference: dihydrodipicolinate synthase, 2yxg, r2yxgsf

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