Coexistence of two main folded G-quadruplexes within a single G-rich domain in the EGFR promoter.

ABSTRACT: EGFR is an oncogene which codifies for a tyrosine kinase receptor that represents an important target for anticancer therapy. Indeed, several human cancers showed an upregulation of the activity of this protein. The promoter of this gene contains some G-rich domains, thus representing a yet unexplored point of intervention to potentially silence this gene. Here, we explore the conformational equilibria of a 30-nt long sequence located at position -272 (EGFR-272). By merging spectroscopic and electrophoretic analysis performed on the wild-type sequence as well as on a wide panel of related mutants, we were able to prove that in potassium ion containing solution this sequence folds into two main G-quadruplex structures, one parallel and one hybrid. They show comparable thermal stabilities an

SUBMITTER: Greco ML 

PROVIDER: S-EPMC5737278 | biostudies-literature | 2017 Sep

REPOSITORIES: biostudies-literature