title: Structural requirement of leucine for activation of p70 S6 kinase.
abstract: The addition of leucine induced activation of p70S6k in amino acid-depleted H4IIE cells. Whereas the activation of p70S6k by leucine was transient, the complete amino acid stimulated p70S6k more persistently. The effect of leucine on p70S6k was sensitive to rapamycin, but less sensitive to wortmannin. Using various amino acids and derivatives of leucine, we found that the chirality, the structure of the four branched hydrocarbons, and the primary amine are required for the ability of leucine to stimulate p70S6k, indicating that the structural requirement of leucine to induce p70S6k activation is very strict and precise. In addition, some leucine derivatives exhibited the ability to stimulate p70S6k and the other derivatives acted as inhibitors against the leucine-induced activation of p70S6k.
authors.affiliation: Biosignal Research Center, Kobe University, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Shigemitsu
authors.forename: Y
authors.initials: Y
authors.lastname: Tsujishita
authors.forename: H
authors.initials: H
authors.lastname: Miyake
authors.forename: S
authors.initials: S
authors.lastname: Hidayat
authors.forename: N
authors.initials: N
authors.lastname: Tanaka
authors.forename: K
authors.initials: K
authors.lastname: Hara
authors.forename: K
authors.initials: K
authors.lastname: Yonezawa
mesh_terms: D000596:Amino Acids / Q000494:pharmacology; D000730:Androstadienes / Q000494:pharmacology; D000818:Animals; D002460:Cell Line; D004789:Enzyme Activation / Q000187:drug effects; D007930:Leucine / Q000031:analogs & derivatives / Q000737:chemistry / Q000494:pharmacology*; D051381:Rats; D019893:Ribosomal Protein S6 Kinases / Q000378:metabolism*; D020123:Sirolimus / Q000494:pharmacology; D013329:Structure-Activity Relationship; D000077191:Wortmannin
chemical_list: D000596:Amino Acids; D000730:Androstadienes; C117670:N-acetylleucinamide; D019893:Ribosomal Protein S6 Kinases; D007930:Leucine; D020123:Sirolimus; D000077191:Wortmannin