| Literature DB >> 17257865 |
Marzena Sieńko1, Renata Natorff, Zbigniew Zieliński, Arkadiusz Hejduk, Andrzej Paszewski.
Abstract
Methylenetetrahydrofolate reductase (MTHFR) catalyzes the reduction of 5,10-methylenetetrahydrofolate to 5-methyltetrahydrofolate, a co-substrate in the synthesis of methionine from homocysteine. We have cloned and characterized two Aspergillus nidulans genes encoding MTHFRs: metA and metF. Mutations in either gene result in methionine requirement; the metA-encoded enzyme is responsible for only 10-15% of total MTHFR activity. These two enzymes belong to different classes of MTHFRs. Mutations in metA but not in the metF gene are suppressed by mutations resulting in enhancement of homocysteine synthesis. The expression of both genes is up-regulated by homocysteine.Entities:
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Year: 2006 PMID: 17257865 DOI: 10.1016/j.fgb.2006.12.002
Source DB: PubMed Journal: Fungal Genet Biol ISSN: 1087-1845 Impact factor: 3.495