This is an acidic sequence segment domain found in the splicing factor SYNCRIP (hnRNP Q) which is involved in viral replication, neural morphogenesis, modulation of circadian oscillation and the regulation of the cytidine deaminase APOBEC1. This domain is a self-folding globular domain with an all alpha-helix architecture with negatively charged surface areas. Additionally it contains a large hydrophobic cavity and a positively charged surface area as potential epitopes for inter-molecular interactions [1].

1: The acidic domain is a unique structural feature of the splicing factor SYNCRIP. Beuck C, Williamson JR, Wuthrich K, Serrano P; Protein Sci. 2016;25:1545-1550. PMID:27081926