Biomaterial Database

Ammonia regulation of nod genes in Bradyrhizobium japonicum. 1990

S P Wang, and G Stacey

Department of Microbiology, University of Tennessee, Knoxville 37996-0845.

The expression of the nodD and nodYABC operons of Bradyrhizobium japonicum is repressed by the addition of ammonia. Repression of nodYABC expression is probably due to the effect on nodD since NodD positively regulates itself, as well as other nod operons. The effect of ammonia is independent of the known nitrogen regulatory protein, NtrC, and another regulatory protein for nitrogen fixation, NifA.

UI	MeSH Term	Description	Entries
D009876	Operon	In bacteria, a group of metabolically related genes, with a common promoter, whose transcription into a single polycistronic MESSENGER RNA is under the control of an OPERATOR REGION.	Operons
D005838	Genotype	The genetic constitution of the individual, comprising the ALLELES present at each GENETIC LOCUS.	Genogroup,Genogroups,Genotypes
D000641	Ammonia	A colorless alkaline gas. It is formed in the body during decomposition of organic materials during a large number of metabolically important reactions. Note that the aqueous form of ammonia is referred to as AMMONIUM HYDROXIDE.
D012230	Rhizobiaceae	A family of gram-negative bacteria which are saprophytes, symbionts, or plant pathogens.	Bradyrhizobium lupini,Neorhizobium galegae,Rhizobium galegae,Rhizobium lupini
D015964	Gene Expression Regulation, Bacterial	Any of the processes by which cytoplasmic or intercellular factors influence the differential control of gene action in bacteria.	Bacterial Gene Expression Regulation,Regulation of Gene Expression, Bacterial,Regulation, Gene Expression, Bacterial