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winged-helix domain (WHD) found in cockayne syndrome group B (CSB) and similar proteins CSB, also called cockayne syndrome protein CSB, DNA excision repair protein ERCC-6, ERCC Excision Repair 6, or ATP-dependent helicase ERCC6, is involved in many DNA repair processes and is essential for transcription-coupled repair (TCR). It regulates DNA double-strand break (DSB) repair and checkpoint activation. Upon DNA-binding, it locally modifies DNA conformation by wrapping the DNA around itself, thereby modifying the interface between stalled RNA polymerase II and DNA. It is required for TCR complex formation. CSB also regulates transcription and chromatin remodeling activities that are essential for neuronal differentiation and neuritogenesis. This model corresponds to the winged-helix domain (WHD) of CSB, which is involved in the recruitment of CSB to DSBs. The CSB WHD folds as a single globular domain, defining a class of ubiquitin-binding domains (UBDs) different from other UBD classes.
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Jiyao W et al.(2023). "The conserved domain database in 2023.",