Conformational switch regulates the DNA cytosine deaminase activity of human APOBEC3B

Ke Shi, Özlem Demir, Michael A. Carpenter, Jeff Wagner, Kayo Kurahashi, Reuben S. Harris, Rommie E. Amaro, Hideki Aihara

Producción científica: Articlerevisión exhaustiva

25 Citas (Scopus)


The APOBEC3B (A3B) single-stranded DNA (ssDNA) cytosine deaminase has important roles in innate immunity but is also a major endogenous source of mutations in cancer. Previous structural studies showed that the C-terminal catalytic domain of human A3B has a tightly closed active site, and rearrangement of the surrounding loops is required for binding to substrate ssDNA. Here we report structures of the A3B catalytic domain in a new crystal form that show alternative, yet still closed, conformations of active site loops. All-atom molecular dynamics simulations support the dynamic behavior of active site loops and recapitulate the distinct modes of interactions that maintain a closed active site. Replacing segments of A3B loop 1 to mimic the more potent cytoplasmic deaminase APOBEC3A leads to elevated ssDNA deaminase activity, likely by facilitating opening of the active site. These data collectively suggest that conformational equilibrium of the A3B active site loops, skewed toward being closed, controls enzymatic activity by regulating binding to ssDNA substrates.

Idioma originalEnglish (US)
Número de artículo17415
PublicaciónScientific reports
EstadoPublished - dic 1 2017
Publicado de forma externa

ASJC Scopus subject areas

  • General


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