Gene/Protein Disease Symptom Drug Enzyme Compound
Pivot Concepts:   Target Concepts:
Query: EC:3.2.1.23 (beta-galactosidase)
 14,648 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

Bacterial two-hybrid system is a newly developed method for studying protein-protein interactions, especially for effects of the environmental factors on the interaction. In our studies of the effect of NH(4)( ) or oxygen on the NifL-NifA interaction, it was found that E.coli strain DHP1 cya(-), when transformed by T18-NifL together with T25-NifA, exhibited high activity of beta-galactosidase in the presence of NH(4)( ), and appeared as red colonies when grown in MacConkey/maltose agar. This indicated the direct interaction of NifL and NifA. However,similar phenomena were also shown in the case of the DHP1 cya(-) strain harboring T18-NifL or T25-NifL alone, respectively, without its interacting counterpart T25-NifA or T18-NifA. In this paper, a brief method is presented to detect the protein-protein interaction using direct assay of the adenylate cyclase, thus minimizing the false positives produced by the beta-galactosidase activity assay or MacConkey/maltose agar plating.
 ...
PMID:Improvement of Bacterial Two Hybrid System. 1205 Jul 95