Fine-Tuning Limited Proteolysis: A Major Role for Regulated Site-Specific O-Glycosylation

Christoffer K. Goth, Sergey Y. Vakhrushev, Hiren J. Joshi, Henrik Clausen, Katrine T. Schjoldager

Index: 10.1016/j.tibs.2018.02.005

Full Text: HTML

Abstract

Limited proteolytic processing is an essential and ubiquitous post-translational modification (PTM) affecting secreted proteins; failure to regulate the process is often associated with disease. Glycosylation is also a ubiquitous protein PTM and site-specific O-glycosylation in close proximity to sites of proteolysis can regulate and direct the activity of proprotein convertases, a disintegrin and metalloproteinases (ADAMs), and metalloproteinases affecting the activation or inactivation of many classes of proteins, including G-protein-coupled receptors (GPCRs). Here, we summarize the emerging data that suggest O-glycosylation to be a key regulator of limited proteolysis, and highlight the potential for crosstalk between multiple PTMs.