Processing and maturation of carboxypeptidase y and alkaline phosphatase in Schizosaccharomyces pombe

Hiroyuki Mukaiyama, Tomoko Iwaki, Alimjan Idiris, Kaoru Takegawa

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)


Schizosaccharomyces pombe carboxypeptidase Y (CPY) is synthesized as a zymogen and transported into the vacuole where maturation and activation occurs. The 110-kDa S. pombe CPY precursor is processed twice and finally converted to a mature form consisting of polypeptides of approximately 19 and 32 kDa linked by a single disulfide bond. In Saccharomyces cerevisiae, maturation of CPY occurs mostly through the activity of vacuolar aspartyl protease Pep4p, whereas a Pep4p homolog has not been found in the S. pombe genome database. Based on analysis of protease-deficient mutants, we found that S. pombe CPY was not able to be processed or activated in isp6Δpsp3Δ double disruptants. Both Isp6p and Psp3p are subtilase-type serine proteases with related sequences. Moreover, alkaline phosphatase of S. pombe was found to be localized at the vacuolar membrane and was also unprocessed in isp6Δpsp3Δ double disruptants. Vacuolar localization of GFP-fused Isp6p and Psp3p was determined by fluorescence microscopy. These results suggest that the two serine proteases Isp6p and Psp3p are functional in the vacuole and are involved in proteolytic processing of vacuolar proteins.

Original languageEnglish
Pages (from-to)203-213
Number of pages11
JournalApplied Microbiology and Biotechnology
Issue number1
Publication statusPublished - Apr 2011

All Science Journal Classification (ASJC) codes

  • Biotechnology
  • Applied Microbiology and Biotechnology


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