Relative contributions of non-essential Sec pathway components and cell envelope-associated proteases to high-level enzyme secretion by Bacillus subtilis.

Abstract:

BACKGROUND:Bacillus subtilis is an important industrial workhorse applied in the production of many different commercially relevant proteins, especially enzymes. Virtually all of these proteins are secreted via the general secretion (Sec) pathway. Studies from different laboratories have demonstrated essential or non-essential contributions of various Sec machinery components to protein secretion in B. subtilis. However, a systematic comparison of the impact of each individual Sec machinery component under conditions of high-level protein secretion was so far missing. RESULTS:In the present study, we have compared the contributions of non-essential Sec pathway components and cell envelope-associated proteases on the secretion efficiency of three proteins expressed at high level. This concerned the α-amylases AmyE from B. subtilis and AmyL from Bacillus licheniformis, and the serine protease BPN' from Bacillus amyloliquefaciens. We compared the secretion capacity of mutant strains in shake flask cultures, and the respective secretion kinetics by pulse-chase labeling experiments. The results show that secDF, secG or rasP mutations severely affect AmyE, AmyL and BPN' secretion, but the actual effect size depends on the investigated protein. Additionally, the chaperone DnaK is important for BPN' secretion, while AmyE or AmyL secretion are not affected by a dnaK deletion. Further, we assessed the induction of secretion stress responses in mutant strains by examining AmyE- and AmyL-dependent induction of the quality control proteases HtrA and HtrB. Interestingly, the deletion of certain sip genes revealed a strong differential impact of particular signal peptidases on the magnitude of the secretion stress response. CONCLUSIONS:The results of the present study highlight the importance of SecDF, SecG and RasP for protein secretion and reveal unexpected differences in the induction of the secretion stress response in different mutant strains.

journal_name

Microb Cell Fact

journal_title

Microbial cell factories

authors

Neef J,Bongiorni C,Schmidt B,Goosens VJ,van Dijl JM

doi

10.1186/s12934-020-01315-2

subject

Has Abstract

pub_date

2020-02-28 00:00:00

pages

52

issue

1

issn

1475-2859

pii

10.1186/s12934-020-01315-2

journal_volume

19

pub_type

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