Genetic reconstitution of the high-affinity L-arabinose transport system

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Genetic reconstitution of the high-affinity L-arabinose transport system.

Expression plasmids containing various portions of araFGH operon sequences were assayed for their ability to facilitate the high-affinity L-arabinose transport process in a strain lacking the chromosomal copy of this operon. Accumulation studies demonstrated that the specific induction of all three operon coding sequences was necessary to restore high-affinity L-arabinose transport. Kinetic ana...

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The Penicillium chrysogenum transporter PcAraT enables high-affinity, glucose-insensitive l-arabinose transport in Saccharomyces cerevisiae

Background l-Arabinose occurs at economically relevant levels in lignocellulosic hydrolysates. Its low-affinity uptake via the Saccharomyces cerevisiae Gal2 galactose transporter is inhibited by d-glucose. Especially at low concentrations of l-arabinose, uptake is an important rate-controlling step in the complete conversion of these feedstocks by engineered pentose-metabolizing S. cerevisiae s...

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Solubilization and reconstitution of the Pseudomonas aeruginosa high affinity branched-chain amino acid transport system.

The high affinity branched-chain amino acid transport system (LIV-I) in Pseudomonas aeruginosa is composed of five components: BraC, a periplasmic binding protein for branched-chain amino acids; BraD and BraE, integral membrane proteins; BraF and BraG, putative nucleotide-binding proteins. By using a T7 RNA polymerase/promoter system we overproduced the BraD, BraE, BraF, and BraG proteins in Es...

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Regulation of the L-arabinose transport operons in Escherichia coli.

I,-Arabinosr is transported into Escherichia coli via two independent transport systems, a system possessing relatively low affinity for arabinose, the araE system, and a system of higher affinity for arabinose, t)he araFG system. In the work reported here we demonstrate that insert,ion of the Mu-Zac bacteriophage isolated by Casadaban 8r Cohen (1979) permits a reliable measurement’ of the expr...

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The araE low affinity L-arabinose transport promoter. Cloning, sequence, transcription start site and DNA binding sites of regulatory proteins.

The promoter for the gene encoding the low affinity L-arabinose uptake protein in Escherichia coli was studied. The promoter was cloned, sequenced, its transcription start site determined by S1 nuclease mapping, the proteins required for in vitro transcription were determined, and the regulatory protein binding sites located by DNase footprinting. The araE promoter shows no evidence of an opera...

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ژورنال

عنوان ژورنال: Journal of Bacteriology

سال: 1989

ISSN: 0021-9193,1098-5530

DOI: 10.1128/jb.171.6.3053-3059.1989