Characterization of mutations that allow p-aminobenzoyl-glutamate utilization by Escherichia coli.
Characterization of mutations that allow p-aminobenzoyl-glutamate utilization by Escherichia coli.
复制标题
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
复制
发表时间:
1998
影响因子:
3.2
通讯作者:
Nichols,BP
中科院分区:
文献类型:
--
作者:
Hussein,MJ;Green,JM;Nichols,BP
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.
登录
查看更多内容
DOI:
--
发表时间:
1984
期刊:
The Journal of biological chemistry
影响因子:
--
作者:
Matocha,MF;Waterman,MR
通讯作者:
Waterman,MR
影响因子:
4.8
作者:
Trzeciak,WH;Waterman,MR;Simpson,ER
通讯作者:
Simpson,ER
DOI:
10.1073/pnas.83.19.7490
发表时间:
1986
影响因子:
11.1
作者:
Trzeciak,WH;Ahmed,CE;Simpson,ER;Ojeda,SR
通讯作者:
Ojeda,SR
DOI:
10.1073/pnas.81.18.5628
发表时间:
1984
影响因子:
11.1
作者:
John,ME;John,MC;Ashley,P;MacDonald,RJ;Simpson,ER;Waterman,MR
通讯作者:
Waterman,MR
影响因子:
--
作者:
Hall,PF
通讯作者:
Hall,PF