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Volume 153, Issue 12

SufA – a novel subtilisin-like serine proteinase of Free

Abstract

is an anaerobic Gram-positive bacterium and commensal, which is also associated with clinically important conditions such as skin and soft tissue infections. This study describes a novel subtilisin-like extracellular serine proteinase of denoted SufA (btilase of ), which is believed to be the first subtilase described among Gram-positive anaerobic cocci. SufA is associated with the bacterial cell surface, but is also released in substantial amounts during bacterial growth. Papain was used to release SufA from the surface of and the enzyme was purified by ion-exchange chromatography and gel filtration. A protein band on SDS-PAGE corresponding to the dominating proteolytic activity on gelatin zymography was analysed by MS/MS. Based on the peptide sequences obtained, the gene was sequenced. The gene comprises 3466 bp corresponding to a preprotein of 127 kDa. Like other members of the subtilase family, SufA contains the catalytic triad of aspartic acid, histidine and serine with surrounding conserved residues. A SufA homologue was identified in 33 of 34 investigated isolates of as revealed by PCR and immunoprinting. The enzyme forms dimers, which are more proteolytically active than the monomeric protein. SufA was found to efficiently cleave and inactivate the antibacterial peptide LL-37 and the CXC chemokine MIG/CXCL9, indicating that the enzyme promotes survival and colonization.

  • Received:
  • Accepted:
  • Revised:
  • Published Online:
Keyword(s): AMPs, antimicrobial peptides , GST, glutathione S-transferase , hBD-3, human β-defensin-3 , HNP-1, human neutrophil protein 1 and SufA, subtilase of Finegoldia magna
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2007-12-01
2024-04-20
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SufA – a novel subtilisin-like serine proteinase of Finegoldia magna
Microbiology 153, 4208 (2007); https://doi.org/10.1099/mic.0.2007/010322-0
/content/journal/micro/10.1099/mic.0.2007/010322-0
/content/journal/micro/10.1099/mic.0.2007/010322-0
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