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Plant Cell Reports

, Volume 39, Issue 1, pp 89–100 | Cite as

Toward alternative sources of milk coagulants for cheese manufacturing: establishment of hairy roots culture and protease characterization from Cynara cardunculus L.

  • André Folgado
  • Ana Sofia Pires
  • Ana Cristina Figueiredo
  • Catarina Pimentel
  • Rita AbranchesEmail author
Original Article

Abstract

Key message

Extracts from hairy root cultures of Cynara cardunculus L. contain proteases and show milk-clotting activity.

Abstract

Cynara cardunculus L. or cardoon is often used as rennet in traditional cheese manufacturing, due to the presence of specific proteases in the flower. However, the flower extracts are variable depending on the provenance and quality of the flowers as well as high genetic variability among cardoon populations, and this affects the quality of the final product. In search for alternative sources of milk-clotting enzymes, hairy root cultures from cardoon were obtained and characterized regarding their protease content and proteolytic activity toward milk proteins. Aspartic, serine and cysteine proteases were identified in hairy roots by mass spectrometry analysis and an azocasein assay combined with specific inhibitors. RT-PCR analysis revealed the expression of cardosin A and D, and immunoblotting analysis suggested the presence of cardosin A or cardosin A-like enzyme in its mature form, supporting this system as an alternative source of cardosins. Hairy root protein extracts showed activity over caseins, supporting its use as milk coagulant, which was further tested by milk-clotting assays. This is also the first report on the establishment of hairy root cultures from cardoon, which paves the way for future work on controlled platforms for production of valuable metabolites which are known to be present in this species.

Keywords

Cardoon Hairy roots Proteolytic activity Enzyme Protease Cardosin 

Abbreviations

APs

Aspartic proteases

BSA

Bovine serum albumin

HR

Hairy roots

PBS

Phosphate-buffered saline

PMSF

Phenylmethylsulfonyl fluoride

PVPP

Polyvinylpolypyrrolidone

SH

Schenk and Hildebrandt medium

Notes

Acknowledgements

This work was supported by Fundação para a Ciência e Tecnologia (FCT, Portugal) through project “Proteases from Cynara cardunculus L.: study of gene expression and establishment of alternative production platforms” (ref. PTDC/BAA-AGR/30447/2017), Research Unit Bioresources 4 Sustainability (ref. UID/Multi/04551/2013), and PhD Fellowship to AF (ref. PD/BD/114488/2016, Plants for Life PhD Program). MS data were obtained by the UniMS – Mass Spectrometry Unit, ITQB/IBET, Oeiras, Portugal. The authors wish to thank Isaura Simões and Rita B. Santos for helpful discussions throughout the course of this work, Bruno Alexandre for help with the MS analysis, and Andreas Schiermeyer for critical reading of the manuscript.

Author contribution statement

AF and RA conceived and designed the research. AF and ASP conducted experiments. ACF and CP contributed reagents and tools for hairy root cultures and gene expression analysis, respectively. AF and RA wrote the manuscript. All authors analyzed the data and approved the manuscript.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Plant Cell Biology Laboratory, Instituto de Tecnologia Química e Biológica António Xavier (ITQB NOVA)Universidade Nova de LisboaOeirasPortugal
  2. 2.Faculdade de Ciências da Universidade de LisboaCentro de Estudos do Ambiente e do Mar (CESAM Lisboa), Centro de Biotecnologia Vegetal (CBV)LisbonPortugal
  3. 3.Genomics and Stress Laboratory, Instituto de Tecnologia Química e Biológica António Xavier (ITQB NOVA)Universidade Nova de LisboaOeirasPortugal

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