Phosphoproteomic insight into the changes in structural proteins of muscle architecture associated with texture softening of grass carp (Ctenopharyngodon idella) fillets during chilling storage

•More down-regulated phosphosites of structural proteins were found at d6 than d0.•Dephosphorylation of structural proteins was related with texture softening.•Myosin, actin, collagen and cytoskeleton were major structural dephosphoproteins.•Kinases, phosphatases and assembly regulators tended to be dephosphorylated.•Dephosphorylation mostly appeared at Serine site in structural proteins of muscle.