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异亮氨酸 - 缬氨酸途径突变伴随的硫胺素依赖性川芎嗪积累。

Thiamine-dependent accumulation of tetramethylpyrazine accompanying a mutation in the isoleucine-valine pathway.

作者信息

Demain A L, Jackson M, Trenner N R

出版信息

J Bacteriol. 1967 Aug;94(2):323-6. doi: 10.1128/jb.94.2.323-326.1967.

Abstract

A mutant of Corynebacterium glutamicum was found to accumulate high concentrations of a material which crystallized upon cooling of the broth. The compound was identified as tetramethylpyrazine. The mutant was found to require isoleucine, valine, leucine, and pantothenate for growth. All four requirements probably result from the loss of a single enzyme of the isoleucine-valine pathway. Since similar mutants of Neurospora crassa accumulate acetoin, the present mutant probably forms tetramethylpyrazine from acetoin. Accumulation of tetramethylpyrazine was dependent upon addition of thiamine. This observation is consistent with the known activity of diphosphothiamine as a cofactor for the formation of acetolactate (a precursor of acetoin) from pyruvate.

摘要

发现谷氨酸棒杆菌的一个突变体能够积累高浓度的一种物质,该物质在肉汤冷却时会结晶。该化合物被鉴定为四甲基吡嗪。发现该突变体生长需要异亮氨酸、缬氨酸、亮氨酸和泛酸盐。所有这四种需求可能是由于异亮氨酸 - 缬氨酸途径中单一酶的缺失所致。由于粗糙脉孢菌的类似突变体积累乙偶姻,目前这个突变体可能由乙偶姻形成四甲基吡嗪。四甲基吡嗪的积累依赖于硫胺素的添加。这一观察结果与已知的二磷酸硫胺素作为丙酮酸形成乙酰乳酸(乙偶姻的前体)的辅因子的活性一致。

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