Mapping Hidden Residual Structure within the Myc bHLH-LZ Domain Using Chemical Denaturant Titration.
Structure
; 27(10): 1537-1546.e4, 2019 10 01.
Article
en En
| MEDLINE
| ID: mdl-31402220
ABSTRACT
Intrinsically disordered proteins (IDPs) underpin biological regulation and hence are highly desirable drug-development targets. NMR is normally the tool of choice for studying the conformational preferences of IDPs, but the association of regions with residual structure into partially collapsed states can lead to poor spectral quality. The bHLH-LZ domain of the oncoprotein Myc is an archetypal example of such behavior. To circumvent spectral limitations, we apply chemical denaturant titration (CDT)-NMR, which exploits the predictable manner in which chemical denaturants disrupt residual structure and the rapid exchange between conformers in IDP ensembles. The secondary structure propensities and tertiary interactions of Myc are determined for all bHLH-LZ residues, including those with poor NMR properties under native conditions. This reveals conformations that are not predictable using existing crystal structures. The CDT-NMR method also maps sites perturbed by the prototype Myc inhibitor, 10058-F4, to areas of residual structure.
Palabras clave
Texto completo:
1
Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Proteínas Proto-Oncogénicas c-myc
Tipo de estudio:
Prognostic_studies
Límite:
Humans
Idioma:
En
Revista:
Structure
Asunto de la revista:
BIOLOGIA MOLECULAR
/
BIOQUIMICA
/
BIOTECNOLOGIA
Año:
2019
Tipo del documento:
Article
País de afiliación:
Reino Unido