Peptides derived from a short stretch of diphtheria toxin bind to heparin-binding epidermal growth factor-like growth factor.
Toxicon
; 169: 109-116, 2019 Nov.
Article
em En
| MEDLINE
| ID: mdl-31494209
ABSTRACT
Membrane-anchored heparin-binding EGF-like growth factor (HB-EGF) is the receptor for diphtheria toxin (DT). Mutated or truncated, non-toxic DT has been used earlier for HB-EGF-targeted drug delivery and to modulate HB-EGF signaling. In the present work, we have synthesized a peptide corresponding to a 26 amino acid long stretch of the receptor-binding domain of DT. This region of DT makes multiple contacts with HB-EGF and has residues critical for binding to HB-EGF. We show that this peptide and two of its mutants bind to HB-EGF. We have also created recombinant proteins by fusing Maltose-binding Protein (MBP) with these peptides. These recombinant MBP-tagged peptides bind to HB-EGF with affinities in the range of 10-7 to 10-8â¯M. We have observed that these MBP-tagged peptides can modulate molecular signaling of HB-EGF. Therefore, this 26 amino acid long stretch of DT can be considered as an independent functional segment for binding to HB-EGF. Peptides corresponding to this region may be used for HB-EGF targeted cellular delivery of molecular cargo or to modulate HB-EGF signaling.
Palavras-chave
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Toxina Diftérica
/
Família de Proteínas EGF
Tipo de estudo:
Prognostic_studies
Idioma:
En
Revista:
Toxicon
Ano de publicação:
2019
Tipo de documento:
Article