Cloning and Sequencing of the Chromosomal DNA and cDNA Encoding the Mitochondrial Citrate Synthase of Aspergillus niger WU-2223L
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概要
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The complementary DNA (cDNA) and chromosomal DNA encoding the citrate synthase (EC 4.1.3.7) gene (cit1) of Aspergillus niger WU-2223L, a citric acid-producing strain, were cloned. Synthetic oligonucleotide primers were designed according to the amino acid sequences of already known eukaryotic citrate synthases and the codon bias of A. niger genes. The 920-bp DNA fragment was amplified by polymerase chain reaction with these primers using chromosomal DNA of WU-2223L as a template, and was empolyed to screen a cDNA library of A. niger. One full-length cDNA clone was isolated and sequenced, within which an ORF of 1425 bp encoding a protein of 475 aa with a molecular weight of 52, 153 Da was found. Its N-terminal region contains a typical mitochondrial-targeting motif. The predicted aa sequence was 82, 68, and 65% homologous with the mitochondrial citrate synthases of Neurospora crassa, Saccharomyces cerevisiae, and pig, respectively, but it showed lower homology to bacterial citrate synthases. The full-length cDNA clone was used to screen a chromosomal library of A. niger WU-2223L, and a 7.5kb-salI fragment containing the corresponding chromosomal gene was isolated. Comparison of the chromosomal and cDNA sequences revealed that the cit1 gene is interrupted by six introns. In the chromosomal DNA, upstream of the coding region, a CT-rich region, but not the TATAAA or CAAT motifs, was found. Escherichia coli MOB150, a citrate synthase-deficient mutant showing a glutamate-requiring phenotype, was transformed with the plasmid pKAC-35S, which is the expression vector pKK223-3 containing the cDNA fragment encoding a putative mature protein of A. niger citrate synthase. The transformant harboring pKAC-35S showed citrate synthase activity and a glutamate-nonrequiring phenotype.
- 社団法人日本生物工学会の論文
- 1999-09-25
著者
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Usami Shoji
Department of Molecular Biotechnology, Graduate School of Advanced Sciences of Matter, Hiroshima Uni
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KIRIMURA Kohtaro
Department of Applied Chemistry, School of Science and Engineering, Waseda University
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Kino K
Department Of Applied Chemistry School Of Science And Engineering Waseda University
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YODA MASASHI
Department of Applied Chemistry, School of Science and Engineering, Waseda University
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Usami S
Waseda Univ. Tokyo Jpn
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Usami S
Waseda Univ.
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Usami Shoji
Dept. Biol. Fac. Sci. Nagoya Univ.
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KO IKUYO
Department of Applied Chemistry, School of Science and Engineering, Waseda University
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OSHIDA YUICHI
Department of Applied Chemistry, School of Science and Engineering, Waseda University
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MIYAKE KOUICHIRO
Department of Applied Chemistry, School of Science and Engineering, Waseda University
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Ko Ikuyo
Department Of Applied Chemistry School Of Science And Engineering Waseda University
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Oshida Yuichi
Department Of Applied Chemistry School Of Science And Engineering Waseda University
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Miyake Kouichiro
Department Of Applied Chemistry School Of Science And Engineering Waseda University
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Kirimura Kohtaro
Department Of Applied Chemistry Faculty Of Science And Engineering Waseda University
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Usami Shoji
Department Of Applied Chemistry Faculty Of Science And Engineering Waseda University
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Yoda Masashi
Department Of Applied Chemistry School Of Science And Engineering Waseda University
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