Activity‐based proteomics reveals nine target proteases for the recombinant protein‐stabilizing inhibitor SlCYS8 in Nicotiana benthamiana

Summary Co‐expression of protease inhibitors like the tomato cystatin SlCYS8 is useful to increase recombinant protein production in plants, but key proteases involved in protein proteolysis are still unknown. Here, we performed activity‐based protein profiling to identify proteases that are inhibit...

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Veröffentlicht in:Plant biotechnology journal 2019-08, Vol.17 (8), p.1670-1678
Hauptverfasser: Jutras, Philippe V., Grosse‐Holz, Friederike, Kaschani, Farnusch, Kaiser, Markus, Michaud, Dominique, Hoorn, Renier A.L.
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container_issue 8
container_start_page 1670
container_title Plant biotechnology journal
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creator Jutras, Philippe V.
Grosse‐Holz, Friederike
Kaschani, Farnusch
Kaiser, Markus
Michaud, Dominique
Hoorn, Renier A.L.
description Summary Co‐expression of protease inhibitors like the tomato cystatin SlCYS8 is useful to increase recombinant protein production in plants, but key proteases involved in protein proteolysis are still unknown. Here, we performed activity‐based protein profiling to identify proteases that are inhibited by SlCYS8 in agroinfiltrated Nicotiana benthamiana. We discovered that SlCYS8 selectively suppresses papain‐like cysteine protease (PLCP) activity in both apoplastic fluids and total leaf extracts, while not affecting vacuolar‐processing enzyme and serine hydrolase activity. A robust concentration‐dependent inhibition of PLCPs occurred in vitro when purified SlCYS8 was added to leaf extracts, indicating direct cystatin–PLCP interactions. Activity‐based proteomics revealed that nine different Cathepsin‐L/‐F‐like PLCPs are strongly inhibited by SlCYS8 in leaves. By contrast, the activity of five other Cathepsin‐B/‐H‐like PLCPs, as well as 87 Ser hydrolases, was unaffected by SlCYS8. SlCYS8 expression prevented protein degradation by inhibiting intermediate and mature isoforms of granulin‐containing proteases from the Resistant‐to‐Desiccation‐21 (RD21) PLCP subfamily. Our data underline the key role of endogenous PLCPs on recombinant protein degradation and reveal candidate proteases for depletion strategies.
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subjects activity‐based protein profiling
Biodegradation
biotechnology
Cathepsins
cystatin
Cystatins
Cystatins - pharmacology
Cysteine
Cysteine proteinase
Degradation
Depletion
Desiccation
Grants
Granulin
Hydrolase
Isoforms
Leaves
Mass spectrometry
Nicotiana - enzymology
Nicotiana benthamiana
Papain
papain‐like cysteine proteases
Peptide Hydrolases - genetics
Peptides
Plant extracts
Plants
Protease
protease inhibitor
Protease inhibitors
Protease Inhibitors - pharmacology
protein degradation
protein synthesis
Proteinase inhibitors
Proteins
Proteolysis
Proteomics
Recombinant Proteins
Scientific imaging
Serine
Serine hydrolase
SlCYS8
Tomatoes
title Activity‐based proteomics reveals nine target proteases for the recombinant protein‐stabilizing inhibitor SlCYS8 in Nicotiana benthamiana
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