Tannerella

Abstract

Tan.ne.rel'la. L. dim. suffix ‐ ella ; N.L. fem. dim. n. Tannerella named after the American microbiologist Anne C. R. Tanner, for her contributions to research on periodontal disease. Bacteroidetes / Bacteroidia / Bacteroidales / Porphyromonadaceae / Tannerella Fusiform cells , generally 0.3–0.5 × 1–30 µm. Gram‐negative. Nonmotile. Obligately anaerobic . N ‐ acetylmuramic acid ( NAM ) is required for growth (some strains do not require NAM). Growth is inhibited in the presence of 20 % bile . The major end products are acetic acid, butyric acid, isovaleric acid, propionic acid, and phenylacetic acid; smaller amounts of isobutyric acid and succinic acid may be produced. Esculin is hydrolyzed. Indole variable. Trypsin activity is positive . Glucose‐6‐phosphate dehydrogenase (G6PDH), 6‐phosphogluconate dehydrogenase (6PGDH), malate dehydrogenase, and glutamate dehydrogenase are present. The principal respiratory quinones are menaquinones MK‐10 and MK‐11. Both nonhydroxylated and 3‐hydroxylated long‐chain fatty acids are present. The nonhydroxylated acids are predominantly of the saturated straight‐chain and anteiso methyl‐branched‐chain types. The ratio of C 15 : 0 anteiso to C 15: 0 iso is high (> 20 ). Isolated originally and principally from human oral cavity . Tannerella forsythia has been associated with periodontal disease , root canal infections , and peri‐implantitis . DNA G + C content ( mol %): 44–48. Type species : Tannerella forsythia corrig. (Tanner, Listgarten, Ebersole and Strezempko, 1986) Sakamoto, Suzuki, Umeda, Ishikawa and Benno 2002, 848 VP ( Bacteroides forsythus Tanner, Listgarten, Ebersole and Strezempko, 1986, 216).