Background: Oxalate-degrading bacteria are thought to metabolize intestinal oxalate and thus decrease the urinary excretion of oxalate by reducing its intestinal absorption.
Methods: We have isolated several novel oxalate-degrading bacteria from human stools. Oxalate degrading bacteria were investigated to characterize their protein profiles with antibodies against oxalyl-coenzyme A decarboxylase (65 kDa) and formyl-coenzyme A transferase (48 kDa) purified from Oxalobacter formigenes.
Results: One of these isolates was identified as Providencia rettgeri, which showed two proteins (65 kDa and 48 kDa) on sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS-PAGE) that were not found in non-oxalate-degrading P. rettgeri. Antibodies reacted with the 65 and 48 kDa proteins from the P. rettgeri strain on Western blotting. An Oxalobacter formigenes formyl-coenzyme A transferase gene probe reacted with chromosomal DNA from P. rettgeri on Southern blotting under high stringency conditions, while an Oxalobacter formigenes oxalyl-coenzyme A decarboxylase gene probe did not react under the same conditions.
Conclusions: The mechamism of oxalate degradation by P. rettgeri appears to be similar to that of Oxalobacter formigenes. This is the first report of a facultative oxalate-degrading organism that is one of the Enterobacteriaceae.
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