The tar and tap genes are located adjacent to one another in an operon of chemotaxis-related functions. They encode methyl-accepting chemotaxis proteins implicated in tactic responses to aspartate and maltose stimuli. The functional roles of these two gene products were investigated by isolating and characterizing nonpolar, single-gene deletion mutants at… (More)
The tar locus of Escherichia coli specifies one of the major species of methyl-accepting proteins involved in the chemotactic behavior of this organism. The physical and genetic organization of the tar region was investigated with a series of specialized lambda transducing phages and plasmid clones. The tar gene was mapped at the promoter-proximal end of an… (More)
The tar and tap loci of Escherichia coli encode methyl-accepting inner membrane proteins that mediate chemotactic responses to aspartate and maltose or to dipeptides. These genes lie adjacent to each other in the same orientation on the chromosome and have extensive sequence homology throughout the C-terminal portions of their coding regions. Many… (More)
Computer hackers or their malware surrogates constantly look for software vulnerabilities in the cyberspace to perform various online crimes, such as identity theft, cyber espionage, and denial of service attacks. It is thus crucial to assess accurately the likelihood that a software can be exploited before it is put into practical use. In this work, we… (More)
Duplication end-point mapping in the rIIB cistron indicates that the order of the BS-B10b segments is the inverse of that presented in Benzer's (1961) genetic maps. This findings is supported by two- and three-factor crosses and the phenotypes of rII deletions extending into the D region.