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Title: 1.92 Angstrom Zinc-Free APOBEC3F Catalytic Domain Crystal Structure

Journal Article · · Journal of Molecular Biology

The APOBEC3 family of DNA cytosine deaminases is capable of restricting the replication of HIV-1 and other pathogens. Here, we report a 1.92 Å resolution crystal structure of the Vif-binding and catalytic domain of APOBEC3F (A3F). This structure is distinct from the previously published APOBEC and phylogenetically related deaminase structures, as it is the first without zinc in the active site. We determined an additional structure containing zinc in the same crystal form that allows direct comparison with the zinc-free structure. In the absence of zinc, the conserved active site residues that normally participate in zinc coordination show unique conformations, including a 90 degree rotation of His249 and disulfide bond formation between Cys280 and Cys283. We found that zinc coordination is influenced by pH, and treating the protein at low pH in crystallization buffer is sufficient to remove zinc. Zinc coordination and catalytic activity are reconstituted with the addition of zinc only in a reduced environment likely due to the two active site cysteines readily forming a disulfide bond when not coordinating zinc. We show that the enzyme is active in the presence of zinc and cobalt but not with other divalent metals. Furthermore, these results unexpectedly demonstrate that zinc is not required for the structural integrity of A3F and suggest that metal coordination may be a strategy for regulating the activity of A3F and related deaminases.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE; NIH NIGMS; NIH-ORIP HEI
Grant/Contract Number:
AC02-06CH11357; GM095558; GM109770; P41 GM103403; S10 RR029205
OSTI ID:
1255304
Alternate ID(s):
OSTI ID: 1425518
Journal Information:
Journal of Molecular Biology, Vol. 428, Issue 11; ISSN 0022-2836
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
ENGLISH
Citation Metrics:
Cited by: 27 works
Citation information provided by
Web of Science

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Cited By (11)

Mechanism of Enhanced HIV Restriction by Virion Coencapsidated Cytidine Deaminases APOBEC3F and APOBEC3G journal November 2016
Structural perspectives on HIV‐1 Vif and APOBEC3 restriction factor interactions journal November 2019
Understanding the structural basis of HIV-1 restriction by the full length double-domain APOBEC3G journal January 2020
Structural basis for targeted DNA cytosine deamination and mutagenesis by APOBEC3A and APOBEC3B journal December 2016
Deamination hotspots among APOBEC3 family members are defined by both target site sequence context and ssDNA secondary structure journal January 2020
APOBEC3H structure reveals an unusual mechanism of interaction with duplex RNA journal October 2017
Apolipoprotein B mRNA editing enzyme catalytic polypeptide-like family genes activation and regulation during tumorigenesis journal June 2018
Structural Analysis of the Active Site and DNA Binding of Human Cytidine Deaminase APOBEC3B journal November 2018
Computational Model and Dynamics of Monomeric Full-Length APOBEC3G journal October 2017
APOBEC3B, a molecular driver of mutagenesis in human cancers journal May 2017
A Novel Regulator of Activation-Induced Cytidine Deaminase/APOBECs in Immunity and Cancer: Schrödinger’s CATalytic Pocket journal April 2017