Probing Protein-protein Interactions and Druggable Site Identification: Mechanistic Binding Events Between Ubiquitin and Zinc Finger with UFM1-specific Peptidase Domain Protein (ZUFSP).

Abstract

Deubiquitinating enzymes (DUBs) protein family have been implicated in some deregulated pathways involved in carcinogeneses, such as cell cycle, gene expression, and DNA damage response (DDR). Zinc finger with UFM1-specific peptidase domain protein (ZUFSP) is one of the recently discovered members of the DUBs. To identify and cross-validate the ZUFSP binding site using the bioinformatic tools, including SiteMap&Metapocket, respectively. To understand the molecular basis of complementary ZUFSP-Ub interaction and associated structural events using MD Simulation. In this study, four binding pockets were predicted, characterized, and cross-validated based on physiochemical features such as site score, druggability score, site volume, and site size. Also, a molecular dynamics simulation technique was employed to determine the impact of ubiquitin-binding on ZUFSP. Site 1 with a site score 1.065, Size 102, D scores 1.00, and size volume 261 was predicted to be the most druggable site. Structural studies revealed that upon ubiquitin-binding, the motional movement of ZUFSP was reduced when compared to the unbound ZUFSP. Also, the ZUFSP helical arm (ZHA) domain orient in such a way that it moves closer to the Ub; this orientation enables the formation of a UBD which is very peculiar to ZUFSP. The impact of ubiquitin on ZUFSP movement and the characterization of its predicted druggable site can be targeted in the development of therapeutics.