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An Investigation of Gram-Negative Tannin-Protein Complex Degrading Bacteria in Fecal Flora of Various Mammals

Ken Nemoto, Ro Osawa,1 Katsuhiko Hirota, Tsuneko Ono, and Yoichiro Miyake

1Department of Microbiology, Tokushima University, School of Dentistry, Kuramoto-cho, Tokushima, Japan

Centre for Molecular Biology, School of Life Science, Queensland university of Technology, Gardens point campus, Brisbane Queensland Australia


Gram-negative tannin-protein complex degrading bacteria (T-PCDB) were first isolated from animals except for the koala. The occurrence f T-PCDB in feces of 15 species of mammals with different feeding habits was investigated. T-PCDB occurred in 7 of 54 horses but they could not be isolated from other mammals tested. These T-PCDB comprised of less than 0.1% of the facultative anaerobic microflora in horse feces and it was much less than that previously reported in koala feces (>60%) A total of 7 T-PCDB fecal isolates showed a range of phenotype diversities. They were all Gram-negative rods of carious sizes and shaped including coccoidal rod. Although all produced tannase, no strain showed to have gallate decarboxylase. A total of 23 representative strains belonging to the family Pasteurellaceae were also tested for tannase production. Two strains, Haemophilus actinomycetemcomitans NIAH-10202^T and Haemophilus segnis NIAH-10183^T which were isolated from human oral cavity where detected positive for tannase.