A portable allosteric mechanism.
The allosteric mechanism by which the gene expression regulatory protein AraC regulates its DNA-binding activity is shown to be portable by grafting it to beta-galactosidase, generating an arabinose-regulated beta-galactosidase. A portion of the alpha-peptide sequence that complements the activity of alpha-acceptor beta-galactosidase was inserted into a nonessential region of the regulatory peptidyl arm of AraC protein. Arabinose, which regulates the position of the arm in AraC protein now regulates the availability of the alpha-peptide to alpha-acceptor beta-galactosidase, thereby modulating its activity in response to arabinose.
Biology Department, Johns Hopkins University, Baltimore, Maryland 21218, USA.
Urszula
U
Gryczynski
Robert
R
Schleif
D000494:Allosteric Regulation; D051777:AraC Transcription Factor; D001089:Arabinose / Q000378:metabolism; D001426:Bacterial Proteins / Q000737:chemistry* / Q000378:metabolism; D004926:Escherichia coli / Q000378:metabolism; D029968:Escherichia coli Proteins; D016297:Mutagenesis, Site-Directed; D010446:Peptide Fragments / Q000737:chemistry / Q000378:metabolism; D011485:Protein Binding; D011993:Recombinant Fusion Proteins / Q000737:chemistry / Q000378:metabolism; D012097:Repressor Proteins / Q000737:chemistry* / Q000378:metabolism; D013329:Structure-Activity Relationship; D014157:Transcription Factors / Q000737:chemistry* / Q000378:metabolism; D001616:beta-Galactosidase / Q000737:chemistry / Q000378:metabolism
D051777:AraC Transcription Factor; C497371:AraC protein, E coli; D001426:Bacterial Proteins; D029968:Escherichia coli Proteins; D010446:Peptide Fragments; D011993:Recombinant Fusion Proteins; D012097:Repressor Proteins; D014157:Transcription Factors; D001089:Arabinose; D001616:beta-Galactosidase