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Roles of the RGG Domain and RNA Recognition Motif of Nucleolin in G-Quadruplex Stabilization.

ABSTRACT: G-quadruplexes have important biologic functions that are regulated by G-quadruplex-binding proteins. In particular, G-quadruplex structures are folded or unfolded by their binding proteins and affect transcription and other biologic functions. Here, we investigated the effect of the RNA recognition motif (RRM) and arginine-glycine-glycine repeat (RGG) domain of nucleolin on G-quadruplex formation. Our findings indicate that Phe in the RGG domain of nucleolin is responsible for G-quadruplex binding and folding. Moreover, the RRM of nucleolin potentially binds to a guanine-rich single strand and folds the G-quadruplex with a 5'-terminal and 3'-terminal single strand containing guanine. Our findings contribute to our understanding of how the RRM and RGG domains contribute to G-quadruplex folding and unfolding.

SUBMITTER: Masuzawa T

PROVIDER: S-EPMC7081427 | biostudies-literature | 2020 Mar

REPOSITORIES: biostudies-literature

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Roles of the RGG Domain and RNA Recognition Motif of Nucleolin in G-Quadruplex Stabilization.

Masuzawa Tatsuki T Oyoshi Takanori T

ACS omega 20200305 10

G-quadruplexes have important biologic functions that are regulated by G-quadruplex-binding proteins. In particular, G-quadruplex structures are folded or unfolded by their binding proteins and affect transcription and other biologic functions. Here, we investigated the effect of the RNA recognition motif (RRM) and arginine-glycine-glycine repeat (RGG) domain of nucleolin on G-quadruplex formation. Our findings indicate that Phe in the RGG domain of nucleolin is responsible for G-quadruplex bind ...[more]

PMID: 32201808

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