Fn3_5 is an fn3-like domain which is frequently found as the first of three on streptococcal C5a peptidase (SCP), a highly specific protease and adhesin/invasin. The family is found in conjunction with Pfam:PF00082, Pfam:PF02225 and Pfam:PF00746 [1].

1: Structure of the streptococcal cell wall C5a peptidase. Brown CK, Gu ZY, Matsuka YV, Purushothaman SS, Winter LA, Cleary PP, Olmsted SB, Ohlendorf DH, Earhart CA; Proc Natl Acad Sci U S A. 2005;102:18391-18396. PMID:16344483