Localization of the cytochrome cd1 and copper nitrite reductases in denitrifying bacteria.
The locations of cytochrome cd1 nitrite reductases in Pseudomonas aeruginosa and Pseudomonas fluorescens and copper nitrite reductases in Achromobacter cycloclastes and Achromobacter xylosoxidans were identified. Immunogold labeling with colloidal-gold probes showed that the nitrite reductases were synthesized exclusively in anaerobically grown (denitrifying) cells. Little immunogold label occurred in the cytoplasm of these four strains; most was found in the periplasmic space or was associated with cell membranes. Immunogold labeling of thin sections was superior to fractionation by osmotic shock for locating nitrite reductases. The results support models of dentrification energetics that require a periplasmic, not a cytoplasmic, location for nitrite reductases.
Coyne
M S
MS
Department of Crop and Soil Sciences, Michigan State University, East Lansing 48824.
Arunakumari
A
A
Pankratz
H S
HS
Tiedje
J M
JM
D000421:Alcaligenes / Q000201:enzymology* / Q000648:ultrastructure; D015153:Blotting, Western; D003580:Cytochromes; D003576:Electron Transport Complex IV / Q000378:metabolism*; D007106:Immune Sera; D007150:Immunohistochemistry; D008854:Microscopy, Electron; D009247:NADH, NADPH Oxidoreductases / Q000378:metabolism*; D009572:Nitrite Reductases / Q000378:metabolism*; D011550:Pseudomonas aeruginosa / Q000201:enzymology* / Q000648:ultrastructure; D011551:Pseudomonas fluorescens / Q000201:enzymology* / Q000648:ultrastructure
D003580:Cytochromes; D007106:Immune Sera; D009247:NADH, NADPH Oxidoreductases; D009572:Nitrite Reductases; C028123:nitrite reductase (NO-forming); C052695:nitrite reductase, copper-containing; D003576:Electron Transport Complex IV