title: Synthesis and contractile activity of the C-terminal heptapeptide of substance P with N5-dimethyl glutamine in the 6-position. Active site studies.
abstract: The synthesis and testing of [N5-dimethyl-Gln6]-SP5-11 showed 37 +/- 12% contractile activity relative to SP, and intrinsic efficacy 98 +/- 4%. This finding indicates that the carboxamide groups of the dual Gln5-Cln6 moiety are not equally related with the contractile response of the C-terminal heptapeptide of SP.
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D001681:Biological Assay; D006168:Guinea Pigs; D007082:Ileum / Q000187:drug effects; D009119:Muscle Contraction / Q000187:drug effects*; D010446:Peptide Fragments; D013329:Structure-Activity Relationship; D013373:Substance P / Q000031:analogs & derivatives* / Q000138:chemical synthesis / Q000494:pharmacology
chemical_list: D010446:Peptide Fragments; D013373:Substance P; C027167:substance P (5-11), N,N-diMe-Gln(6)-