Glucose stimulates cAMP accumulation in the oral bacterium Actinomyces viscosus.

Glucose stimulates cAMP accumulation in the oral bacterium Actinomyces viscosus.
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葡萄糖刺激口腔细菌粘性放线菌中 cAMP 的积累。

DOI:
10.1016/0167-4889(93)90200-9
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发表时间:
1993
期刊:
Biochimica et biophysica acta
影响因子:
--
通讯作者:
DiJulio,DH
DiJulio,DH
中科院分区:
--
文献类型:
--
作者:
Watson,EL;Sodhi,S;Lohrke,S;DiJulio,DH

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粘性放线菌 T14V 是一种在口腔中发现的革兰氏阳性细菌,被发现对葡萄糖介导的分解代谢物抑制不敏感。无论培养条件如何,在所有生长阶段均观察到 β-半乳糖苷酶 (18-26 U) 的基础水平。此外,β-半乳糖苷酶不能用乳糖、已知的酶诱导剂异丙基-β-d-硫代半乳糖苷或二丁酰cAMP诱导。另一方面,葡萄糖以浓度依赖性方式刺激 cAMP 积累。果糖和蔗糖模拟葡萄糖对 cAMP 积累的影响,而半乳糖、甘露糖和麦芽糖的刺激作用较小。其他碳源,即乳糖、α-甲基葡萄糖苷、核糖、木糖和琥珀酸没有影响。研究发现,在磷酸二酯酶抑制剂茶碱存在的情况下,葡萄糖和 α-甲基葡萄糖苷可刺激甲苯透化细胞中 cAMP 的积累。葡萄糖不会刺激其他革兰氏阳性细菌(包括变形链球菌、血链球菌和链球菌)的 cAMP 水平。 salivarius 但确实引起了其他 A.salivarius 菌株中 cAMP 的积累。结果表明,葡萄糖对 cAMP 代谢的影响与目前为大肠杆菌定义的 β-半乳糖苷酶的诱导无关,并且该影响似乎对 A 具有选择性。粘性细菌。结果还表明,葡萄糖通过激活腺苷酸环化酶来刺激 cAMP 积累。
Actinomyces viscosusT14V, a Gram-positive bacterium found in the oral cavity, was found to be insensitive to glucose-mediated catabolite repression. Basal levels of β-galactosidase (18–26 U) were observed at all phases of growth regardless of the culture conditions. Further, β-galactosidase could not be induced with lactose, or with a known inducer of the enzyme, isopropyl-β-d-thiogalactoside, or with dibutyryl cAMP. Glucose, on the other hand, stimulated cAMP accumulation in a concentration-dependent manner. Fructose and sucrose mimicked the effects of glucose on cAMP accumulation, whereas galactose, mannose and maltose had lesser stimulatory effects. Other carbon sources, i.e., lactose, α-methylglucoside, ribose, xylose and succinate were without effect. Glucose and α-methylglucoside were found to stimulate cAMP accumulation in toluene-permeabilized cells, in the presence of the phosphodiesterase inhibitor, theophylline. Glucose did not stimulate cAMP levels in other Gram-positive bacteria includingStreptococcus mutans, S. sanguisandS. salivariusbut did cause cAMP accumulation in other strains ofA. viscosus.The results suggest that glucose effects on cAMP metabolism are independent of the induction of β-galactosidase as presently defined forEscherichia coli,and that the effects appear to be selective to theA. viscosusbacteria. The results also suggest that glucose stimulates cAMP accumulation via activation of adenylate cyclase.
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DOI: 10.1139/m80-009
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影响因子: 2.8
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DOI: --
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