Schiller N L, Roberts R B
J Clin Microbiol. 1982 Apr;15(4):740-3. doi: 10.1128/jcm.15.4.740-743.1982.
The growth rate of three vitamin B6-dependent Streptococcus mitior (B6DS) and two non-B6DS strains in Todd-Hewitt broth, with and without vitamin B6 supplementation, was examined. Even in optimally supplemented culture media, the growth rate of the three B6DS strains was much slower than that of comparable non-B6DS strains. Uptake studies with [3H] pyridoxine suggest that these B6DS strains cannot assimilate pyridoxine. Although not transported intracellularly, pyridoxine inhibited the growth of B6DS strains in media supplemented with other vitamin B6 analogs, probably by binding to the vitamin B6 transport system and inhibiting the uptake of the other vitamin B6 analogs.
研究了三株维生素B6依赖型缓症链球菌(B6DS)和两株非B6DS菌株在添加和不添加维生素B6的托德-休伊特肉汤中的生长速率。即使在添加了最佳量维生素的培养基中,三株B6DS菌株的生长速率也比可比的非B6DS菌株慢得多。用[3H]吡哆醇进行的摄取研究表明,这些B6DS菌株不能同化吡哆醇。尽管吡哆醇不能转运到细胞内,但它在添加了其他维生素B6类似物的培养基中抑制了B6DS菌株的生长,可能是通过与维生素B6转运系统结合并抑制其他维生素B6类似物的摄取。