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cystathionine

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cystathionine /cys·ta·thi·o·nine/ (-nēn) a thioester of homocysteine and serine; it serves as an intermediate in the transfer of a sulfur atom from methionine to cysteine.
cys·ta·thi·o·nine (sst-th-nn, -nn)
n.
An intermediate in the conversion of methionine to cysteine.

cystathionine [sis″tah-thi´o-nēn]
a thioester of homocysteine and serine; it serves as an intermediate in the transfer of a sulfur atom from methionine to cysteine.

cystathionine
key intermediate in the trans-sulfuration pathway from methionine to cysteine.


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7) Vitamin B6 Vitamin B6 is a coenzyme for the conversion of homocysteine to nontoxic cystathionine, and deficiency of the vitamin is associated with abnormal homocysteine metabolism.
The latter is fist converted to homocysteine, which is then combined with serine to form cystathionine.
Excess homocysteine also occurs in response to remethylation deficits and a deficiency of an enzyme called cystathionine b-synthase.
 
 
 
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