Cell-associated and extracellular proteinases in Blastocrithidia culicis: Influence of growth conditions

André Luis Souza dos Santos, Celina Monteiro Abreu, Letícia Moulin Batista, Celuta Sales Alviano, Rosangela Maria De Araújo Soares

Research output: Contribution to journalArticlepeer-review

20 Scopus citations


The proteinase profile of Blastocrithidia culicis was analyzed, as well as how different growth conditions influenced its expression by gelatin-SDS-PAGE and the use of specific proteinase inhibitors. Multiple cell-associated proteinases with molecular masses corresponding to 33, 55, 60 kDa (cysteine proteinases) and 77, 80, 90, and 108 kDa (metalloproteinases) were detected using these methods. All the metalloproteinases identified were partitioned into the detergent phase after Triton X-114 extract, suggesting that they are membrane-bound, while all cysteine proteinases were partitioned into the aqueous phase. The proteolytic zymograms were similar when three different media were used for variable times of incubation. However, few quantitative and qualitative changes were observed. The secreted proteinase profile showed an heterogeneous pattern of enzymatic activities whose expression was dependent on time of growth and medium composition. However, the extracellular proteinase activities were abolished by 1,10-phenanthroline, suggesting that all of them are zinc-metalloproteinases.

Original languageEnglish (US)
Pages (from-to)100-106
Number of pages7
JournalCurrent Microbiology
Issue number2
StatePublished - 2001
Externally publishedYes

ASJC Scopus subject areas

  • Microbiology
  • Applied Microbiology and Biotechnology


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