Atasoglu C, Newbold C J, Wallace R J
Rowett Research Institute, Bucksburn, Aberdeen AB21 9SB, United Kingdom.
Appl Environ Microbiol. 2001 Jun;67(6):2819-22. doi: 10.1128/AEM.67.6.2819-2822.2001.
The origin of cell nitrogen and amino acid nitrogen during growth of ruminal cellulolytic bacteria in different growth media was investigated by using (15)NH(3). At high concentrations of peptides (Trypticase, 10 g/liter) and amino acids (15.5 g/liter), significant amounts of cell nitrogen of Fibrobacter succinogenes BL2 (51%), Ruminococcus flavefaciens 17 (43%), and Ruminococcus albus SY3 (46%) were derived from non-NH(3)-N. With peptides at 1 g/liter, a mean of 80% of cell nitrogen was from NH(3). More cell nitrogen was formed from NH(3) during growth on cellobiose compared with growth on cellulose in all media. Phenylalanine was essential for F. succinogenes, and its (15)N enrichment declined more than that of other amino acids in all species when amino acids were added to the medium.
通过使用(^{15}NH_3)研究了瘤胃纤维素分解菌在不同生长培养基中生长期间细胞氮和氨基酸氮的来源。在高浓度肽(胰蛋白胨,10克/升)和氨基酸(15.5克/升)条件下,琥珀酸纤维杆菌BL2(51%)、黄化瘤胃球菌17(43%)和白色瘤胃球菌SY3(46%)的大量细胞氮来源于非(NH_3)-N。当肽浓度为1克/升时,平均80%的细胞氮来自(NH_3)。在所有培养基中,与在纤维素上生长相比,在纤维二糖上生长期间由(NH_3)形成的细胞氮更多。苯丙氨酸对琥珀酸纤维杆菌是必需的,当向培养基中添加氨基酸时,在所有物种中其(^{15}N)富集下降幅度比其他氨基酸更大。