Jiang YR, Yoshida A, Sun XM, Higashitani H, Yamada K, Miyazaki R, Noguchi E, Kuwahara K, Osatomi K. Identification of a Tissue Inhibitor of Metalloproteinase-2: An Endogenous Inhibitor of
Modori-Inducing Insoluble Metalloproteinase from Yellowtail
Seriola quinqueradiata Muscle.
J Agric Food Chem 2023;
71:3414-3423. [PMID:
36753295 DOI:
10.1021/acs.jafc.2c07803]
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Abstract
The existence of an endogenous protease inhibitor (EPI) was expected from the comparison of the gel properties between washed and nonwashed yellowtail surimi gels. A possible candidate, tissue inhibitor of metalloproteinase-2 (TIMP-2), was partially purified from the soluble fraction of yellowtail muscle, and an 18 kDa protein band was detected by sodium dodecyl-sulfate polyacrylamide gel electrophoresis (SDS-PAGE) under nonreducing conditions and western blot analysis. Its N-terminal amino acid sequence was determined as XSXSPAHPQQAF, with high homology to TIMP-2 from other fish species, suggesting that it was identified as yellowtail TIMP-2. Subsequently, full-length cDNA of two isoforms (TIMP-2a and TIMP-2b) was successfully cloned from yellowtail muscle. The N-terminal sequence of purified TIMP-2 completely corresponded to TIMP-2b. When the surimi gel quality decreased after spawning, the mRNA expression of TIMP-2b also decreased. Human TIMP-2 could inhibit autolysis of myofibrillar proteins from yellowtail muscle. Thus, TIMP-2b was considered the major EPI of the modori-inducing insoluble metalloproteinase in yellowtail muscle.
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