Serine-rich repeat proteins from gut microbes.

Area of Science:

• Microbiology
• Bacterial Pathogenesis
• Glycobiology

Background:

• Serine-rich repeat proteins (SRRPs) are Gram-positive bacterial cell surface adhesins.
• SRRPs from pathogens are O-glycosylated and exported via the accessory secretion (aSec) system, contributing to disease.
• Emerging research reveals SRRPs in gut microbes mediate attachment and biofilm formation.

Purpose of the Study:

• To provide an updated overview of SRRP occurrence, structure, and function across bacteria.
• To emphasize the molecular and biochemical properties of SRRPs from gut symbionts, especially Lactobacilli.
• To highlight the significance of SRRP glycosylation in host-microbe interactions within the gut.

Main Methods:

• Literature review and synthesis of existing studies on SRRPs.
• Comparative analysis of SRRPs across different bacterial species.
• Focus on molecular and biochemical characterization of SRRPs from Lactobacilli.

Main Results:

• SRRPs are widespread in Gram-positive bacteria, including gut symbionts.
• The accessory secretion (aSec) system is involved in SRRP export.
• SRRP glycosylation is vital for mediating interactions between gut microbes and the host.

Conclusions:

• SRRPs are versatile adhesins with diverse functions in bacterial interactions.
• Understanding SRRPs from gut symbionts like Lactobacilli is critical for host-microbe research.
• SRRP glycosylation plays a key role in the ecological success and host interactions of gut bacteria.