Kuhner C H, Smith S S, Noll K M, Tanner R S, Wolfe R S
Department of Microbiology, University of Illinois, Urbana 61801.
Appl Environ Microbiol. 1991 Oct;57(10):2891-5. doi: 10.1128/aem.57.10.2891-2895.1991.
Methanomicrobium mobile requires a heat-stable factor present in ruminal fluid and in boiled cell extract from Methanobacterium thermoautotrophicum for growth. By comparing the growth of M. mobile with boiled cell extract with that observed with various methanogenic cofactors, we found that 7-mercaptoheptanoylthreonine phosphate (HS-HTP) supported sustained growth of M. mobile, at an optimal concentration of 100 microM. No derivatives or possible biosynthetic precursors of HS-HTP could replace HS-HTP as the sole source of growth factor. Results suggest that the growth requirement might be satisfied by 7-mercaptoheptanoic acid plus a second, unidentified heat-stable factor.
活动甲烷微菌生长需要瘤胃液和嗜热自养甲烷杆菌煮沸细胞提取物中存在的一种热稳定因子。通过比较活动甲烷微菌与煮沸细胞提取物共同培养时的生长情况和与各种产甲烷辅助因子共同培养时的生长情况,我们发现7-巯基庚酰苏氨酸磷酸(HS-HTP)能支持活动甲烷微菌持续生长,最佳浓度为100微摩尔。HS-HTP的任何衍生物或可能的生物合成前体都不能替代HS-HTP作为唯一的生长因子来源。结果表明,7-巯基庚酸加上另一种未鉴定的热稳定因子可能满足生长需求。