RibM from Streptomyces davawensis is a riboflavin/roseoflavin transporter and may be useful for the optimization of riboflavin production strains.

RibM from Streptomyces davawensis is a riboflavin/roseoflavin transporter and may be useful for the optimization of riboflavin production strains.
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Davawensis链霉菌的RIBM是核黄素/玫瑰花品拉夫蛋白转运蛋白,可能对优化核黄素生产菌株有用。

DOI:
10.1186/1472-6750-11-119
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发表时间:
2011-12-02
期刊:
影响因子:
3.5
通讯作者:
Mack M
Mack M
中科院分区:
工程技术3区
文献类型:
--
作者:
Hemberger S;Pedrolli DB;Stolz J;Vogl C;Lehmann M;Mack M

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枯草芽孢杆菌不是天然核黄素过量生产菌,已通过经典诱变和代谢工程转化为优良的生产菌株。据我们所知,从过量生产细胞的细胞质中增强核黄素排泄尚未被认为是(进一步)菌株改进的目标。在这里,我们评估了来自达瓦文链霉菌的黄素转运蛋白 RibM 对核黄素生产菌株的改进。来自 S. davawensis 的基因 ribM 编码假定的核黄素摄取促进子,针对在枯草芽孢杆菌中的表达进行了密码子优化 (ribMopt)。使用异丙基-β-硫代吡喃半乳糖苷 (IPTG) 诱导型表达质粒 pHT01 将 ribMopt 基因功能性地引入枯草芽孢杆菌中:对 IPTG 处理的重组枯草芽孢杆菌细胞的总 RNA 进行 Northern 印迹分析,揭示了 ribMopt 特异性转录物。 Western blot分析表明,带有his6标签的异源基因产物RibM存在于细胞质膜中。大肠杆菌中 ribM 的表达增加了 [14C] 核黄素的摄取,而这不受质子载体羰基氰间氯苯腙 (CCCP) 的影响。 ribMopt 的表达支持枯草芽孢杆菌 ΔribB::Ermr ΔribU::Kanr 双突变体的生长,该突变体缺乏核黄素合成 (ΔribB),并且也缺乏核黄素摄取 (ΔribU)。 ribMopt 的表达增加了枯草芽孢杆菌 ΔribU::Kanr 菌株的玫瑰黄素(由 S. davawensis 产生的有毒核黄素类似物)敏感性。根据诱导剂 IPTG 的量,过量生产 RibM 的模型核黄素枯草芽孢杆菌生产菌株的核黄素合成显着增加。能量非依赖性黄素促进剂RibM原则上可以催化核黄素输出,因此可用于在使用重组RibM过量生产枯草芽孢杆菌菌株(或任何其他微生物)的核黄素生产过程中增加核黄素产量。
The bacterium Bacillus subtilis, which is not a natural riboflavin overproducer, has been converted into an excellent production strain by classical mutagenesis and metabolic engineering. To our knowledge, the enhancement of riboflavin excretion from the cytoplasm of overproducing cells has not yet been considered as a target for (further) strain improvement. Here we evaluate the flavin transporter RibM from Streptomyces davawensis with respect to improvement of a riboflavin production strain. The gene ribM from S. davawensis, coding for a putative facilitator of riboflavin uptake, was codon optimized (ribMopt) for expression in B. subtilis. The gene ribMopt was functionally introduced into B. subtilis using the isopropyl-β-thiogalactopyranoside (IPTG)-inducible expression plasmid pHT01: Northern-blot analysis of total RNA from IPTG treated recombinant B. subtilis cells revealed a ribMopt specific transcript. Western blot analysis showed that the his6-tagged heterologous gene product RibM was present in the cytoplasmic membrane. Expression of ribM in Escherichia coli increased [14C]riboflavin uptake, which was not affected by the protonophore carbonyl cyanide m-chlorophenylhydrazone (CCCP). Expression of ribMopt supported growth of a B. subtilis ΔribB::Ermr ΔribU::Kanr double mutant deficient in riboflavin synthesis (ΔribB) and also deficient with respect to riboflavin uptake (ΔribU). Expression of ribMopt increased roseoflavin (a toxic riboflavin analog produced by S. davawensis) sensitivity of a B. subtilis ΔribU::Kanr strain. Riboflavin synthesis by a model riboflavin B. subtilis production strain overproducing RibM was increased significantly depending on the amount of the inducer IPTG. The energy independent flavin facilitator RibM could in principle catalyze riboflavin export and thus may be useful to increase the riboflavin yield in a riboflavin production process using a recombinant RibM overproducing B. subtilis strain (or any other microorganism).
DOI: 10.4161/rna.6.2.7727
发表时间: 2009-04
期刊: RNA biology
影响因子: 4.1
作者:
Lee ER;Blount KF;Breaker RR
通讯作者: Breaker RR
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发表时间: 2009-01-01
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发表时间: 2011-02-18
影响因子: 4.8
作者:
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通讯作者: Slotboom, Dirk Jan
DOI: 10.1007/s004380050393
发表时间: 1997-03-18
期刊: MOLECULAR & GENERAL GENETICS
影响因子: --
作者:
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