Characterization of mutations that allow p-aminobenzoyl-glutamate utilization by Escherichia coli.

Characterization of mutations that allow p-aminobenzoyl-glutamate utilization by Escherichia coli.
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允许大肠杆菌利用对氨基苯甲酰谷氨酸的突变的表征。

DOI:
10.1128/jb.180.23.6260-6268.1998
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发表时间:
1998
影响因子:
3.2
通讯作者:
Nichols,BP
Nichols,BP
中科院分区:
生物学3区
文献类型:
--
作者:
Hussein,MJ;Green,JM;Nichols,BP

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对对氨基苯甲酸合成缺陷的大肠杆菌菌株进行诱变,并选择衍生物在叶酸上生长。补充剂被证明是由于在商业叶酸制剂中存在作为分解产物的顶氨基苯甲酰谷氨酸盐。获得了两类突变,其特征在于能够支持生长的对氨基苯甲酰谷氨酸的最低浓度。这两类突变在遗传和物理上都定位在E.大肠染色体从该区域克隆的野生型基因abgT(formerlyydaH)可以赋予亲本菌株类似的对氨基苯甲酰谷氨酸利用表型。突变株的质粒或染色体上的abgT基因的缺失导致表型的丧失,abgT基因是由abgA、abgB、abgT和可能的lyg组成的操纵子中的第三个基因,可能受abgR编码的LysR型调节子的调控。两个不同的单碱基对突变导致对氨基苯甲酰谷氨酸利用表型位于abgR-abgA顺反子间区域,并似乎允许表达abgT。第二类突变是由于与fnr融合的abgBandabgT的串联重复。abgA和abgB基因产物彼此同源,并与一个氨基酰基氨基水解酶家族同源。在几个突变菌株的提取物中可以检测到对氨基苯甲酰谷氨酸水解,但当abgT被反式提供时,完整的abgA和abgB对于对氨基苯甲酰谷氨酸的利用不是必需的。
AnEscherichia colistrain deficient inp-aminobenzoate synthesis was mutagenized, and derivatives were selected for growth on folic acid. Supplementation was shown to be due top-aminobenzoyl-glutamate present as a breakdown product in commercial folic acid preparations. Two classes of mutations characterized by the minimum concentration ofp-aminobenzoyl-glutamate that could support growth were obtained. Both classes of mutations were genetically and physically mapped to about 30 min on theE. colichromosome. A cloned wild-type gene from this region,abgT(formerlyydaH) could confer a similarp-aminobenzoyl-glutamate utilization phenotype on the parental strain. Interruption ofabgTon the plasmid or on the chromosome of the mutant strain resulted in a loss of the phenotype.abgTwas the third gene in an apparent operon containingabgA,abgB,abgT, and possiblyogtand might be regulated by a divergently transcribed LysR-type regulator encoded byabgR. Two different single-base-pair mutations that gave rise to thep-aminobenzoyl-glutamate utilization phenotype lay in theabgR-abgAintercistronic region and appeared to allow the expression ofabgT. The second class of mutation was due to a tandem duplication ofabgBandabgTfused tofnr. TheabgAandabgBgene products were homologous to one another and to a family of aminoacyl aminohydrolases.p-Aminobenzoyl-glutamate hydrolysis could be detected in extracts from several of the mutant strains, but intactabgAandabgBwere not essential forp-aminobenzoyl-glutamate utilization whenabgTwas supplied intrans.
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发表时间: 1986
影响因子: 11.1
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