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Updated: Jun 14, 2025
In Vitro Ubiquitination and Deubiquitination Assays of Nucleosomal Histones
Published on: July 25, 2019
Protocol for evaluating the E3 ligase activity of BRCA1-BARD1 and its variants by nucleosomal histone ubiquitylation
O'Taveon Fitzgerald1, Bo Wu1, Meiling Wang1
1Department of Biochemistry and Structural Biology, University of Texas Health Science Center at San Antonio, San Antonio, TX 78229, USA.
Abstract:
The tumor suppressor breast cancer 1 (BRCA1) complexed with BRCA1-associated RING domain 1 (BARD1), a RING-type E3 ligase, facilitates the attachment of ubiquitin onto the substrate protein. Here, we present a protocol for evaluating the E3 ligase activity of BRCA1-BARD1 and its variants by nucleosomal histone ubiquitylation. We describe steps for isolating 147 bp Widom 601 DNA and assembling nucleosome core particles (NCPs). We then detail procedures for the in vitro ubiquitylation of nucleosome histone H2A by BRCA1-BARD1 and its variants. For complete details on the use and execution of this protocol, please refer to Wang et al.1.
