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
影响因子:
3.5
通讯作者:
Mack M
中科院分区:
文献类型:
--
作者:
Hemberger S;Pedrolli DB;Stolz J;Vogl C;Lehmann M;Mack M
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).
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影响因子:
4.1
作者:
Lee ER;Blount KF;Breaker RR
通讯作者:
Breaker RR
影响因子:
3.2
作者:
Rodionov, Dmitry A.;Hebbeln, Peter;Eitinger, Thomas
通讯作者:
Eitinger, Thomas
DOI:
10.1073/pnas.44.10.1072
发表时间:
1958-01-01
影响因子:
11.1
作者:
SPIZIZEN, J
通讯作者:
SPIZIZEN, J
影响因子:
4.8
作者:
ter Beek, Josy;Duurkens, Ria H.;Slotboom, Dirk Jan
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:
Coquard, D;Huecas, M;Hohmann, HP
通讯作者:
Hohmann, HP