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Ethionine and Methionine Metabolism by the Chrysomonad Flagellate Prymnesium parvum
Author(s) -
RAHAT M.,
HOCHBERG A.
Publication year - 1971
Publication title -
the journal of protozoology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.067
H-Index - 77
eISSN - 1550-7408
pISSN - 0022-3921
DOI - 10.1111/j.1550-7408.1971.tb03338.x
Subject(s) - ethionine , methionine , biochemistry , cysteine , homocysteine , chemistry , methionine synthase , amino acid , moiety , flagellate , metabolism , biology , stereochemistry , botany , enzyme
SYNOPSIS. Ethionine or methionine can serve as sole nitrogen source for growth of Prymnesium parvum . Both amino acids are taken up as such at a ratio of 2 : 1 methionine/ethionine. Ethionine is totally de‐ethylated in the cell, while methionine is probably only partially de‐methylated. The homocysteine moiety of both amino acids is similarly metabolised to form cysteine or re‐methylated to form methionine. De‐ethylation of ethionine seems how P. parvum avoids its antimetabolic effect