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The transsulfuration pathway is a metabolic pathway involving the interconversion of cysteine and homocysteine through the intermediate cystathionine. Two transsulfurylation pathways are known: the forward and the reverse.

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  • The transsulfuration pathway is a metabolic pathway involving the interconversion of cysteine and homocysteine through the intermediate cystathionine. Two transsulfurylation pathways are known: the forward and the reverse. The forward pathway is present in several bacteria, such as Escherichia coli and Bacillus subtilis, and involves the transfer of the thiol group from cysteine to homocysteine (methionine precursor with the S-methyl group), thanks to the γ-replacement of the acetyl or succinyl group of a homoserine with cysteine via its thiol group to form cystathionine (catalysed by cystathionine γ-synthase, which is encoded by metB in E. coli and metI in B. subtilis). Cystathionine is then cleaved by means of the β-elimination of the homocysteine portion of the molecule leaving behind an unstable imino acid, which is attacked by water to form pyruvate and ammonia (catalysed by the metC-encoded cystathionine β-lyase).The production of homocysteine through transsulfuration allows the conversion of this intermediate to methionine, through a methylation reaction carried out by methionine synthase. The reverse pathway is present in several organisms, including humans, and involves the transfer of the thiol group from homocysteine to cysteine via a similar mechanism. In Klebsiella pneumoniae the cystathionine β-synthase is encoded by mtcB, while the γ-lyase is encoded by mtcC.Humans are auxotrophic for methionine, hence it is called an "essential amino acid" by nutritionists, but are not for cysteine due to the reverse trans-sulfurylation pathway. Mutations in this pathway lead to a disease known as homocystinuria, due to homocysteine accumulation. (en)
  • 황전환 경로(黃轉換經路, 영어: transsulfuration pathway)는 대사 중간생성물인 시스타티오닌을 통해 시스테인과 호모시스테인의 상호전환을 포함하는 대사 경로이다. 이것은 아세틸기 또는 석시닐기를 유리 황화물로 대체한다. 이는 cysK 또는 cysM 유전자에 의해 암호화되는 및 metZ 또는 metY 유전자에 의해 암호화되는 를 통해 시스테인 또는 호모시스테인의 합성 및 사용을 위한 것으로 이와는 달리 황화수소 또는 메테인싸이올을 사용하는 와 대조된다. 순방향 및 역방향에서의 두 가지 황전환 경로가 알려져 있다. (ko)
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  • 황전환 경로(黃轉換經路, 영어: transsulfuration pathway)는 대사 중간생성물인 시스타티오닌을 통해 시스테인과 호모시스테인의 상호전환을 포함하는 대사 경로이다. 이것은 아세틸기 또는 석시닐기를 유리 황화물로 대체한다. 이는 cysK 또는 cysM 유전자에 의해 암호화되는 및 metZ 또는 metY 유전자에 의해 암호화되는 를 통해 시스테인 또는 호모시스테인의 합성 및 사용을 위한 것으로 이와는 달리 황화수소 또는 메테인싸이올을 사용하는 와 대조된다. 순방향 및 역방향에서의 두 가지 황전환 경로가 알려져 있다. (ko)
  • The transsulfuration pathway is a metabolic pathway involving the interconversion of cysteine and homocysteine through the intermediate cystathionine. Two transsulfurylation pathways are known: the forward and the reverse. (en)
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  • 황전환 경로 (ko)
  • Transsulfuration pathway (en)
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