THE NIFEN GENES PARTICIPATING IN FEMO COFACTOR BIOSYNTHESIS AND GENES ENCODING DINITROGENASE ARE PART OF THE SAME OPERON IN BRADYRHIZOBIUM SPECIES

被引:15
作者
AGUILAR, OM
TAORMINO, J
THONY, B
RAMSEIER, T
HENNECKE, H
SZALAY, AA
机构
[1] UNIV ALBERTA,CTR PLANT MOLEC GENET & BIOTECHNOL,6-30 MED SCI BLDG,EDMONTON T6G 2H7,ALBERTA,CANADA
[2] SWISS FED INST TECHNOL,INST MIKROBIOL,CH-8092 ZURICH,SWITZERLAND
来源
MOLECULAR & GENERAL GENETICS | 1990年 / 224卷 / 03期
关键词
NITROGEN FIXATION; NIFDKEN OPERON; NUCLEOTIDE SEQUENCE; PROTEIN SEQUENCE CONSERVATION;
D O I
10.1007/BF00262436
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
The nucleotide sequences of genes homologous to the Klebsiella pneumoniae nifEN genes have been determined in Bradyrhizobium japonicum 110. The coding regions for the nifE and nifN consist, respectively, of 1641 and 1407 nucleotides. The nifD gene (coding for the beta-subunit of dinitrogenase) and nifE are linked, and separated by 95 nucleotides. In the region of 12 nucleotides that separates nifE from nifN the stop codon for nifE overlaps the putative ribosome binding site for nifN. In contrast to Klebsiella and Azotobacter vinelandii, the B. japonicum nifEN genes are linked to the nifDK genes in the same operon. Comparison of dinitrogenase polypeptides (nifDK products) and the polypeptides of the nifE and nifN genes reveals considerable homology between nifD and nifE, and between nifK and nifN. Several protein domains, containing highly conserved cysteine residues, are conserved among the gene products of nifD, nifK, nifE and nifN. This result allows us to propose a probable evolutionary pathway for the common origin of these genes.
引用
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页码:413 / 420
页数:8
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