Mild oxidation promotes myosin S2 cross-linking by microbial transglutaminase

Chunqiang Li, Youling L. Xiong

Research output: Contribution to journalArticlepeer-review

18 Scopus citations

Abstract

The cross-linking of myosin, an important property in meat processing, has previously been studied in complex myofibril systems to address free radical and microbial transglutaminase (MTG) effects. In the present study, purified myosin from pork Longissimus muscle was modified with H 2 O 2 and 10 µM Fe to determine the effects of oxidation on the subsequent cross-linking by MTG (E:S = 1:20) at 4 °C. When subjected to MTG, the degree of cross-linking in mildly oxidized myosin sample (1 mM H 2 O 2 ) reached 87.6%, compared to 64.7% in MTG-treated nonoxidized myosin and 33.8% in excessively oxidized myosin (200 mM H 2 O 2 ), based on the ε(γ-glutamyl)lysine bond, SDS-PAGE, and solubility analyses. Although S1 in myosin was always the principal cross-linking site, the S2 subfragment became a significant new region of cross-linking when stressed by 1 mM H 2 O 2 . These findings may guide the MTG application in meat processing where oxidation is not inhibited.

Original languageEnglish
Pages (from-to)390-397
Number of pages8
JournalFood Chemistry
Volume287
DOIs
StatePublished - Jul 30 2019

Bibliographical note

Publisher Copyright:
© 2019 Elsevier Ltd

Keywords

  • 1-(9-Fluorenyl)methyl chloroformate (PubChem CID: 34367)
  • Adenosine triphosphate (PubChem CID: 5957)
  • Cross-linking
  • Myosin
  • N-Ethylmaleimide (PubChem CID: 4362)
  • O-Phthalaldehyde (PubChem CID: 4807)
  • Phenylmethylsulfonyl fluoride (PubChem CID: 4784)
  • Piperazine-N,N’-bis(2-ethanesulfonic acid) (PubChem CID: 79723)
  • Propyl gallate (PubChem CID: 4947)
  • Protein oxidation
  • Tetrahydrofuran (PubChem CID: 8028)
  • Transglutaminase
  • Trolox C (PubChem CID: 40634)
  • β-Mercaptoethanol (PubChem CID: 1567)

ASJC Scopus subject areas

  • Analytical Chemistry
  • Food Science

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