Secreted XEG1-like protein that has lost enzyme activity but binds to host soybean apoplastic glucanase inhibitor protein GIP1 more tightly than does XEG1, thus it outcompetes XEG1 for GIP1 binding and frees functional XEG1 to support P.sojae infection (PubMed:28082413). With XEG1, is required to elevate apoplastic sugar during P.sojae infection (PubMed:28082413). Interacts with host apoplastic glucanase inhibitor GIP1. Conserved residues in regions X1 (position 26), X2 (positions 39 to 44), X3 (positions 77 and 78), and X5 (positions 146 to 150) are all required for full binding activity of XLP1 to host soybean GIP1. Leads to strongly decreased virulence. Belongs to the glycosyl hydrolase 12 (cellulase H) family. Lacks the conserved Glu residue in position 222 essential activity and has thereforelost enzyme activity. Lure - Issue 218 of October 2019