Purinyl-cobamide is a native prosthetic group of reductive dehalogenases.

Purinyl-cobamide is a native prosthetic group of reductive dehalogenases.
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DOI:
10.1038/nchembio.2512
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发表时间:
2018-01
影响因子:
14.8
通讯作者:
Löffler FE
Löffler FE
中科院分区:
生物学1区
文献类型:
--
作者:
Yan J;Bi M;Bourdon AK;Farmer AT;Wang PH;Molenda O;Quaile AT;Jiang N;Yang Y;Yin Y;Şimşir B;Campagna SR;Edwards EA;Löffler FE

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钴胺类化合物,如维生素B12,是结构保守的含钴四吡咯生物分子,在生命的所有领域都具有重要的生化功能。有机卤化物呼吸是自然和人为有机卤素全球循环的重要生物过程,在有机卤化物呼吸过程中,钴酰化物是碳卤素键切割还原脱卤酶所必需的辅基。本研究报道了一种以未取代嘌呤为下碱基的新型cobamide的生物合成,并通过证明co α-嘌呤基-cobamide (purinyl-Cba)是hafniense脱硫菌催化活性四氯乙烯还原脱卤酶的天然假基,赋予了未取代嘌呤的生物学功能。不同低碱基的蜘蛛在功能上并不等同,purinyl-Cba在corcorid -auxotrophic, organo卤素- respiratory细菌中引起不同的生理反应。鉴于依赖于钴胺的酶催化基本代谢途径的关键步骤,新的钴胺结构的发现和低碱基可以有效调节酶活性的认识为操纵微生物组的功能创造了机会。
Cobamides such as vitamin B12 are structurally conserved, cobalt-containing tetrapyrrole biomolecules with essential biochemical functions in all domains of life. In organohalide respiration, a vital biological process for the global cycling of natural and anthropogenic organohalogens, cobamides are the requisite prosthetic groups for carbon–halogen bond-cleaving reductive dehalogenases. This study reports the biosynthesis of a new cobamide with unsubstituted purine as the lower base, and assigns unsubstituted purine a biological function by demonstrating that Coα-purinyl-cobamide (purinyl-Cba) is the native prosthetic group in catalytically active tetrachloroethene reductive dehalogenases of Desulfitobacterium hafniense. Cobamides featuring different lower bases are not functionally equivalent, and purinyl-Cba elicits different physiological responses in corrinoid-auxotrophic, organohalide-respiring bacteria. Given that cobamide-dependent enzymes catalyze key steps in essential metabolic pathways, the discovery of a novel cobamide structure and the realization that lower bases can effectively modulate enzyme activities generate opportunities to manipulate functionalities of microbiomes.
细胞外嘌呤,嘌呤能受体和肿瘤生长。
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