Crystal structure of PPEP-1(E143A/Y178F) in complex with substrate peptide Ac-EVNPAVP-CONH2

Molecular determinants of the mechanism and substrate specificity ofClostridium difficileproline-proline endopeptidase-1.

PETRA III, EMBL c/o DESY BEAMLINE P13 (MX1)

GSHMDSTTIQQNKDTLSQIVVFPTGNYDKNEANAMVNRLANIDGKYLNALKQNNLKIKLLSGKLTDEKEYAYLKGVVPKG
WEGTGKTWDDVPGLGGSTVALRIGFSNKGKGHDAINLELHATAHAIDHIVLNDISKSAQFKQIFAKEGRSLGNVNFLGVY
PEEFFAESFAYYYLNQDTNSKLKSACPQTYSFLQNLAK

2 microl 12 mg per ml rPPEP-1 E143A Y178F with 6 mM substrate peptide in 20 mM Tris pH 7.5, 200 mM NaCl was mixed with 1 microl precipitant solution containing: 100 mM Tris pH 7.5, 2.25 M ammonium phosphate. Reservoir solution: 200 microl

The peptide is proteolytically cleaved by PPEP-1 implying that the peptide has to form a complex with the protease

Pro-Pro endopeptidase 1, zinc metallopeptidase, Clostridium difficile, virulence factor, HYDROLASE

DSTTIQQNKDTLSQIVVFPTGNYDKNEANAMVNRLANIDGKYLNALKQNNLKIKLLSGKLTDEKEYAYLKGVVPKGWEGT
GKTWDDVPGLGGSTVALRIGFSNKGKGHDAINLELHETAHAIDHIVLNDISKSAQFKQIFAKEGRSLGNVNYLGVYPEEF
FAESFAYYYLNQDTNSKLKSACPQTYSFLQNLAK

binding site for Di-peptide ACE C 118 and GLU C 119

binding site for Di-peptide VAL C 124 and LPD C 125

binding site for Di-peptide ACE D 118 and GLU D 119

binding site for Di-peptide VAL D 124 and LPD D 125