title: Functional groups of elongation factor 2 involved in interactions with guanosine nucleotides and ribosomes.
abstract: Treatment of rat liver EF-2 with N-ethylmaleimide (MalNEt) did not affect the direct interactions of the factor with guanine nucleotides or with ribosomes, but inhibited the binding of guanosine 5'-(beta, gamma-methylene)triphosphate (GuoPP(CH2)P) to the EF-2-ribosome complex. The amino group reactive reagent 2,4,6-trinitrobenzenesulfonate (TNBS), however, inhibited specifically the direct interactions of EF-2 with guanine nucleotides, but not the binding of GuoPP(CH2)P to the EF-2-ribosome complex. The different sensitivities of EF-2 to MalNEt and to TNBS suggested that the binding sites involved in the binary vs. ternary complex might correspond to different conformational states or might even be distinct physical entities.
mesh_terms: D000246:Adenosine Diphosphate Ribose / Q000378:metabolism; D005033:Ethylmaleimide / Q000494:pharmacology; D006150:Guanine Nucleotides / Q000378:metabolism*; D006160:Guanosine Triphosphate / Q000031:analogs & derivatives / Q000378:metabolism; D020652:Peptide Elongation Factor 2; D010445:Peptide Elongation Factors / Q000378:metabolism*; D012270:Ribosomes / Q000378:metabolism*; D014302:Trinitrobenzenesulfonic Acid / Q000494:pharmacology
chemical_list: D006150:Guanine Nucleotides; D020652:Peptide Elongation Factor 2; D010445:Peptide Elongation Factors; D000246:Adenosine Diphosphate Ribose; C011265:guanosine 5'-(beta,gamma-methylene)triphosphate; D006160:Guanosine Triphosphate; D014302:Trinitrobenzenesulfonic Acid; D005033:Ethylmaleimide