title: The Aspergillus nidulans cysA gene encodes a novel type of serine O-acetyltransferase which is homologous to homoserine O-acetyltransferases.
abstract: The Aspergillus nidulans cysA gene was cloned by functional complementation of the cysA1 mutation that impairs the synthesis of O:-acetylserine. The molecular nature of cysA1 and cysA103 alleles was characterized; a nucleotide substitution and a frame shift were found in the former and a deletion mutation in the latter. The CYSA protein is 525 amino acids long and is encoded by an uninterrupted open reading frame. Expression of the cysA gene appears not to be regulated by sulfur, carbon and nitrogen sources. Protein sequence analysis reveals extensive similarity to homoserine O:-acetyltransferases, particularly the bacterial ones, and no homology with known serine O:-acetyltransferases. The authors propose that the CYSA protein is analogous to serine O:-acetyltransferases, i.e. it catalyses the same reaction but has an independent evolutionary origin.
authors.affiliation: Institute of Biochemistry and Biophysics, Polish Academy of Sciences, 5A Pawinskiego St, 02-106 Warszawa, Poland1.
authors.forename: Marcin
authors.initials: M
authors.lastname: Grynberg
authors.affiliation: Institute of Biochemistry and Biophysics, Polish Academy of Sciences, 5A Pawinskiego St, 02-106 Warszawa, Poland1.
authors.forename: Jacek
authors.initials: J
authors.lastname: Topczewski
authors.affiliation: The Burnham Institute, 10901 N. Torrey Pines Rd, La Jolla, CA 92037, USA2.
authors.forename: Adam
authors.initials: A
authors.lastname: Godzik
authors.affiliation: Institute of Biochemistry and Biophysics, Polish Academy of Sciences, 5A Pawinskiego St, 02-106 Warszawa, Poland1.
authors.forename: Andrzej
authors.initials: A
authors.lastname: Paszewski
mesh_terms: D000123:Acetyltransferases / Q000737:chemistry / Q000235:genetics* / Q000378:metabolism; D000595:Amino Acid Sequence; D001233:Aspergillus nidulans / Q000201:enzymology* / Q000235:genetics; D003001:Cloning, Molecular; D015966:Gene Expression Regulation, Fungal; D005816:Genetic Complementation Test; D008969:Molecular Sequence Data; D009154:Mutation; D010802:Phylogeny; D016415:Sequence Alignment; D017422:Sequence Analysis, DNA; D017386:Sequence Homology, Amino Acid; D051050:Serine O-Acetyltransferase
chemical_list: D000123:Acetyltransferases; D051050:Serine O-Acetyltransferase; C021369:homoserine O-acetyltransferase