FIG. 1.

Schematic representation of the predicted domains of PrtH (22) and PrtH2 of L. helveticus CNRZ32. Each number refers to the last amino acid of a domain. The catalytic triad and the amino acid number corresponding in the catalytic domain are indicated. The localization of the primers used in this work is shown by arrows. S, signal sequence; PP, preprodomain; PR, catalytic proteinase domain; A, A domain; B, B domain; H, helical domain; W, cell wall domain. The hatched part of the PrtH catalytic domain corresponds to insertion domain I. The C-terminal 101-aa region of PrtH showing homology with S-layer proteins is overlined.