Binding of PGRPs to isolated polymeric peptidoglycan. PGRP-SA, sLCa, and sLCx were incubated with polymeric peptidoglycan from M. luteus (M.l.), S. aureus (S.a.), B. megaterium (B.m.), E. coli (E.c.), L. casei C (L.c.), L. plantarum (L.p.), or L. fermentum (L.f.). Bound protein (B) was separated from free protein (F) by using centrifugation, and proteins were visualized by using Coomassie staining.