3-Chloro-<scp>DL</scp>-alanine resistance by<scp>L</scp>-methionine-α-deamino-γ-mercaptomethane-lyase activity
作者:Mamiko Yoshimura、Yoshio Nakano、Haruka Fukamachi、Toshihiko Koga
DOI:10.1016/s0014-5793(02)02958-7
日期:2002.7.17
gene from F. nucleatum and showed that the gene encodes an L‐methionine‐α‐deamino‐γ‐mercaptomethane‐lyase that catalyzes the α,γ‐elimination of L‐methionine to produce methyl mercaptan. The enzyme also exhibits 3CA chloride‐lyase (deaminating) activity. This antibacterial agent is expected to be useful for specific selection of malodorous oral bacteria producing high amounts of methyl mercaptan.
抗菌剂 3-氯-DL-丙氨酸 (3CA) 是肽聚糖合成的抑制剂。具核梭杆菌和牙龈卟啉单胞菌(导致口腔异味的细菌)对 1 mM 3CA 具有抗性,而变形链球菌和大肠杆菌在相同浓度下对这种抗菌剂敏感。我们从 F. nucleatum 中分离了 3CA 抗性基因,并表明该基因编码 L-甲硫氨酸-α-脱氨基-γ-巯基甲烷-裂解酶,该酶催化 L-甲硫氨酸的 α,γ-消除以产生甲硫醇。该酶还表现出 3CA 氯化物裂解酶(脱氨基)活性。预计这种抗菌剂可用于特定选择产生大量甲硫醇的恶臭口腔细菌。