Unravelling the dominant role of phosphorylation degree in governing the functionality of reassembled casein micelles: Implications for future dairy production through precision fermentation

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Názov: Unravelling the dominant role of phosphorylation degree in governing the functionality of reassembled casein micelles: Implications for future dairy production through precision fermentation
Autori: Che, Jing, Fan, Zekun, Bijl, Etske, Thomsen, Julia Prangchat Stub, Mijakovic, Ivan, 1975, Hettinga, Kasper, Poulsen, Nina Aagaard, Larsen, Lotte Bach
Zdroj: Är Bacillus subtilis PtkA reglerad som ett "cyclin-dependant" kinas? Food Hydrocolloids. 159
Predmety: Acid-induced gelation, TEM, Calcium-binding ability, Reassembled casein micelles, Dephosphorylation
Popis: This study investigated the effect of bovine casein (CN) phosphorylation degree on micelle reassembly, stability, calcium-binding, and acid-induced gelation or precipitation, with the aim of assessing the feasibility of utilising microbial CNs in future dairy production. The four CNs (αS1-, αS2-, β-, and κ-CN) were purified from bovine milk and subjected to enzymatic dephosphorylation, resulting in three pools – fully and partially phosphorylated and fully dephosphorylated. Nine reassembled CN micelle solutions (RCMS) were investigated, consisting of three systems (two of four-CN, and one of β/κ-CN) and three phosphorylation degrees of the corresponding CNs. The distribution of different components (protein, calcium, and phosphorus) into micellar, serum, and insoluble fractions after two centrifugation steps was studied. The pH stability relative to acid-gelation or precipitation of the formed RCMS was further investigated. Results showed that the micelle reassembly ability of RCMS containing all four CNs was proportional to the phosphorylation degree; CNs with higher phosphorylation degrees contained a higher proportion of micelles and exhibited greater calcium-binding ability, whereas fully dephosphorylated CNs hardly formed CN micelle structures. The gelation pH of RCMS increased with decreasing phosphorylation degree, whereas the fully dephosphorylated CNs completely failed in gelation but precipitated when reaching their isoelectric point at pH 5.5. Moreover, RCMS containing only β/κ-CN at their native full phosphorylation were unstable at the salt concentrations applied, with more than half of the CNs self-associating to flocculate. Our study confirms the essential role of phosphorylation degree in micelle reassembly and stability, providing important information for potential future applications of microbial CNs that are expected to exhibit non-native phosphorylation levels.
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Prístupová URL adresa: https://research.chalmers.se/publication/542841
https://research.chalmers.se/publication/542841/file/542841_Fulltext.pdf
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Items – Name: Title
  Label: Title
  Group: Ti
  Data: Unravelling the dominant role of phosphorylation degree in governing the functionality of reassembled casein micelles: Implications for future dairy production through precision fermentation
– Name: Author
  Label: Authors
  Group: Au
  Data: <searchLink fieldCode="AR" term="%22Che%2C+Jing%22">Che, Jing</searchLink><br /><searchLink fieldCode="AR" term="%22Fan%2C+Zekun%22">Fan, Zekun</searchLink><br /><searchLink fieldCode="AR" term="%22Bijl%2C+Etske%22">Bijl, Etske</searchLink><br /><searchLink fieldCode="AR" term="%22Thomsen%2C+Julia+Prangchat+Stub%22">Thomsen, Julia Prangchat Stub</searchLink><br /><searchLink fieldCode="AR" term="%22Mijakovic%2C+Ivan%22">Mijakovic, Ivan</searchLink>, 1975<br /><searchLink fieldCode="AR" term="%22Hettinga%2C+Kasper%22">Hettinga, Kasper</searchLink><br /><searchLink fieldCode="AR" term="%22Poulsen%2C+Nina+Aagaard%22">Poulsen, Nina Aagaard</searchLink><br /><searchLink fieldCode="AR" term="%22Larsen%2C+Lotte+Bach%22">Larsen, Lotte Bach</searchLink>
– Name: TitleSource
  Label: Source
  Group: Src
  Data: <i>Är Bacillus subtilis PtkA reglerad som ett "cyclin-dependant" kinas? Food Hydrocolloids</i>. 159
– Name: Subject
  Label: Subject Terms
  Group: Su
  Data: <searchLink fieldCode="DE" term="%22Acid-induced+gelation%22">Acid-induced gelation</searchLink><br /><searchLink fieldCode="DE" term="%22TEM%22">TEM</searchLink><br /><searchLink fieldCode="DE" term="%22Calcium-binding+ability%22">Calcium-binding ability</searchLink><br /><searchLink fieldCode="DE" term="%22Reassembled+casein+micelles%22">Reassembled casein micelles</searchLink><br /><searchLink fieldCode="DE" term="%22Dephosphorylation%22">Dephosphorylation</searchLink>
– Name: Abstract
  Label: Description
  Group: Ab
  Data: This study investigated the effect of bovine casein (CN) phosphorylation degree on micelle reassembly, stability, calcium-binding, and acid-induced gelation or precipitation, with the aim of assessing the feasibility of utilising microbial CNs in future dairy production. The four CNs (αS1-, αS2-, β-, and κ-CN) were purified from bovine milk and subjected to enzymatic dephosphorylation, resulting in three pools – fully and partially phosphorylated and fully dephosphorylated. Nine reassembled CN micelle solutions (RCMS) were investigated, consisting of three systems (two of four-CN, and one of β/κ-CN) and three phosphorylation degrees of the corresponding CNs. The distribution of different components (protein, calcium, and phosphorus) into micellar, serum, and insoluble fractions after two centrifugation steps was studied. The pH stability relative to acid-gelation or precipitation of the formed RCMS was further investigated. Results showed that the micelle reassembly ability of RCMS containing all four CNs was proportional to the phosphorylation degree; CNs with higher phosphorylation degrees contained a higher proportion of micelles and exhibited greater calcium-binding ability, whereas fully dephosphorylated CNs hardly formed CN micelle structures. The gelation pH of RCMS increased with decreasing phosphorylation degree, whereas the fully dephosphorylated CNs completely failed in gelation but precipitated when reaching their isoelectric point at pH 5.5. Moreover, RCMS containing only β/κ-CN at their native full phosphorylation were unstable at the salt concentrations applied, with more than half of the CNs self-associating to flocculate. Our study confirms the essential role of phosphorylation degree in micelle reassembly and stability, providing important information for potential future applications of microbial CNs that are expected to exhibit non-native phosphorylation levels.
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  Label: File Description
  Group: SrcInfo
  Data: electronic
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        Value: 10.1016/j.foodhyd.2024.110615
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      – Text: English
    Subjects:
      – SubjectFull: Acid-induced gelation
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      – SubjectFull: TEM
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      – SubjectFull: Calcium-binding ability
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            – TitleFull: Är Bacillus subtilis PtkA reglerad som ett "cyclin-dependant" kinas? Food Hydrocolloids
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