Staphylococcus aureus protein tyrosine phosphatase PtpA (PtpA)

Staphylococcus aureus protein tyrosine phosphatase PtpA (PtpA) is a secreted, low-molecular-weight protein tyrosine phosphatase produced by *Staphylococcus aureus*. It counteracts host defenses during infection, contributing to virulence through interference with host cell signaling, particularly by reducing SUMOylation and downregulating Ubc9, an enzyme critical for SUMO modification of host proteins. PtpA’s structure closely resembles eukaryotic protein tyrosine phosphatases, with a conserved catalytic fold but several unique features that may facilitate selective inhibitor design. Genetic deletion of ptpA impairs S. aureus’s ability to survive within macrophages, underscoring its influence on pathogenesis and bacterial persistence. The protein’s family is widely conserved across *Staphylococcus* species, indicating an important functional role. While specific drugs are not yet approved against PtpA, its structure and substrate recognition features make it a promising therapeutic target in the context of infectious disease caused by *S. aureus*.

Other names

Low molecular weight protein-tyrosine-phosphatase PtpASecreted tyrosine phosphatase PtpA

Inhibitors would act by blocking phosphatase activity and substrate binding, thus preventing virulence-related modulation of host phosphoproteins.