title: Stimulation of Escherichia coli F-18Col- type-1 fimbriae synthesis by leuX.
abstract: Escherichia coli F-18, a normal human fecal isolate, is an excellent colonizer of the streptomycin-treated mouse large intestine. E. coli F-18Col-, a derivative of E. coli F-18 which no longer makes the E. coli F-18 colicin, colonizes the large intestine as well as E. coli F-18 when fed to mice alone but is eliminated when fed together with E. coli F-18. Recently we randomly cloned E. coli F-18 DNA into E. coli F-18Col- and let the mouse intestine select the best colonizer. In this way, we isolated a 6.5-kb E. coli F-18 DNA sequence that simultaneously stimulated synthesis of type 1 fimbriae and enhanced E. coli F-18Col- colonizing ability. In the present investigation we show that the gene responsible for stimulation of type 1 fimbriae synthesis appears to be leuX, which encodes a tRNA specific for the rare leucine codon UUG. Moreover, it appears that expression of leuX may be regulated by two proteins (22 kDa and 26 kDa) encoded by genes immediately adjacent to leuX.
authors.affiliation: Department of Biochemistry, Microbiology, and Molecular Genetics, University of Rhode Island, Kingston 02881.
authors.forename: J V
authors.initials: JV
authors.lastname: Newman
authors.forename: R L
authors.initials: RL
authors.lastname: Burghoff
authors.forename: L
authors.initials: L
authors.lastname: Pallesen
authors.forename: K A
authors.initials: KA
authors.lastname: Krogfelt
authors.forename: C S
authors.initials: CS
authors.lastname: Kristensen
authors.forename: D C
authors.initials: DC
authors.lastname: Laux
authors.forename: P S
authors.initials: PS
authors.lastname: Cohen
mesh_terms: D000371:Agglutination; D001422:Bacterial Adhesion; D003062:Codon; D003087:Colicins / Q000235:genetics; D004926:Escherichia coli / Q000235:genetics* / Q000472:pathogenicity; D010861:Fimbriae, Bacterial / Q000378:metabolism*; D008358:Mannose / Q000378:metabolism; D012343:RNA, Transfer / Q000235:genetics*; D015183:Restriction Mapping; D014774:Virulence / Q000235:genetics
chemical_list: D003062:Codon; D003087:Colicins; D012343:RNA, Transfer; D008358:Mannose