Chitinase activity in the crystalline style of the american oyster Crassostrea virginica

Understanding the mechanisms involved in the high sensitivity of Pecten maximus larvae to aeration

“…In previous studies, chitinase activity was reported in C. virginica, M. edulis, and C. angulata crystalline structures (Smucker and Wright 1984;Birkbeck and McHenery 1984;Yang et al 2015), as well as in C. angulata larval stages (Yang et al 2015). As chitinases are required for the degradation of chitin-containing structures, such as algae, we hypothesize that the depletion of chitinase (CHIT1) mRNA was most likely a signal of reduced digestive function.…”

Understanding the mechanisms involved in the high sensitivity of Pecten maximus larvae to aeration

“…In previous studies, chitinase activity was reported in C. virginica, M. edulis, and C. angulata crystalline structures (Smucker and Wright 1984;Birkbeck and McHenery 1984;Yang et al 2015), as well as in C. angulata larval stages (Yang et al 2015). As chitinases are required for the degradation of chitin-containing structures, such as algae, we hypothesize that the depletion of chitinase (CHIT1) mRNA was most likely a signal of reduced digestive function.…”

Polysaccharidases in the Crystalline Styles of Selectively Bred Greenshell Mussel (Perna canaliculusGmelin) Families

“…In light of these results, were the enzyme activities assayed appropriate targets within the context of mussel nutrition? It has been known for some time that the bivalve crystalline style contains endogenous chitinase activity (Birbeck & McHenery 1984, Smucker & Wright 1984), and there are various possible functional roles for chitinases in the digestive tract of bivalves. Observations have shown that zooplankton may at times provide a significant part of the diet of bivalves (Davenport et al 2000, Zeldis et al 2004).…”

Molecular Analysis of Atypical Family 18 Chitinase from Fujian Oyster Crassostrea angulata and Its Physiological Role in the Digestive System

“…After the umbo-veliger larvae develop to a later period, the signal site of Ca -chit was shown clearly and formed into a ‘clavate’ shape. In previous studies, specific activity of chitinase was present in the Crassostrea virginica crystalline structures [ 16 ] and the Mytilus edulis contained the highest concentrations of chitinase found in the crystalline structure and in the digestive gland [ 19 ]. In filter-feeding bivalves, the crystalline structure is an elongated rod of solidified mucus, which projects into the stomach from an associated sac, and extends along the neutral arms of the visceral mass; an important part of the digestive system [ 38 , 39 ].…”

“…The crystalline structure is the principal organ of extracellular digestion, which is rotated in its sac by cilia, which head projects into the stomach and grinds against part of the chitinous gastric shield lined stomach wall. Chitinase activity has been detected in the crystalline structure of the American oyster Crassostrea virginica [ 16 ]. In other respects, two genes encoding the chitinase protein and chitinase-like protein had been characterized with their cDNAs from the oyster Crassostrea gigas , but both of them functioned on the immunity [ 17 , 18 ].…”

Understanding the mechanisms involved in the high sensitivity of Pecten maximus larvae to aeration

“…In previous studies, chitinase activity was reported in C. virginica, M. edulis, and C. angulata crystalline structures (Smucker and Wright 1984;Birkbeck and McHenery 1984;Yang et al 2015), as well as in C. angulata larval stages (Yang et al 2015). As chitinases are required for the degradation of chitin-containing structures, such as algae, we hypothesize that the depletion of chitinase (CHIT1) mRNA was most likely a signal of reduced digestive function.…”

Polysaccharidases in the Crystalline Styles of Selectively Bred Greenshell Mussel (Perna canaliculusGmelin) Families

“…In light of these results, were the enzyme activities assayed appropriate targets within the context of mussel nutrition? It has been known for some time that the bivalve crystalline style contains endogenous chitinase activity (Birbeck & McHenery 1984, Smucker & Wright 1984), and there are various possible functional roles for chitinases in the digestive tract of bivalves. Observations have shown that zooplankton may at times provide a significant part of the diet of bivalves (Davenport et al 2000, Zeldis et al 2004).…”

Molecular Analysis of Atypical Family 18 Chitinase from Fujian Oyster Crassostrea angulata and Its Physiological Role in the Digestive System

“…After the umbo-veliger larvae develop to a later period, the signal site of Ca -chit was shown clearly and formed into a ‘clavate’ shape. In previous studies, specific activity of chitinase was present in the Crassostrea virginica crystalline structures [ 16 ] and the Mytilus edulis contained the highest concentrations of chitinase found in the crystalline structure and in the digestive gland [ 19 ]. In filter-feeding bivalves, the crystalline structure is an elongated rod of solidified mucus, which projects into the stomach from an associated sac, and extends along the neutral arms of the visceral mass; an important part of the digestive system [ 38 , 39 ].…”

“…The crystalline structure is the principal organ of extracellular digestion, which is rotated in its sac by cilia, which head projects into the stomach and grinds against part of the chitinous gastric shield lined stomach wall. Chitinase activity has been detected in the crystalline structure of the American oyster Crassostrea virginica [ 16 ]. In other respects, two genes encoding the chitinase protein and chitinase-like protein had been characterized with their cDNAs from the oyster Crassostrea gigas , but both of them functioned on the immunity [ 17 , 18 ].…”

Understanding the mechanisms involved in the high sensitivity of Pecten maximus larvae to aeration

“…In previous studies, chitinase activity was reported in C. virginica, M. edulis, and C. angulata crystalline structures (Smucker and Wright 1984;Birkbeck and McHenery 1984;Yang et al 2015), as well as in C. angulata larval stages (Yang et al 2015). As chitinases are required for the degradation of chitin-containing structures, such as algae, we hypothesize that the depletion of chitinase (CHIT1) mRNA was most likely a signal of reduced digestive function.…”

Polysaccharidases in the Crystalline Styles of Selectively Bred Greenshell Mussel (Perna canaliculusGmelin) Families

“…In light of these results, were the enzyme activities assayed appropriate targets within the context of mussel nutrition? It has been known for some time that the bivalve crystalline style contains endogenous chitinase activity (Birbeck & McHenery 1984, Smucker & Wright 1984), and there are various possible functional roles for chitinases in the digestive tract of bivalves. Observations have shown that zooplankton may at times provide a significant part of the diet of bivalves (Davenport et al 2000, Zeldis et al 2004).…”

Molecular Analysis of Atypical Family 18 Chitinase from Fujian Oyster Crassostrea angulata and Its Physiological Role in the Digestive System

“…After the umbo-veliger larvae develop to a later period, the signal site of Ca -chit was shown clearly and formed into a ‘clavate’ shape. In previous studies, specific activity of chitinase was present in the Crassostrea virginica crystalline structures [ 16 ] and the Mytilus edulis contained the highest concentrations of chitinase found in the crystalline structure and in the digestive gland [ 19 ]. In filter-feeding bivalves, the crystalline structure is an elongated rod of solidified mucus, which projects into the stomach from an associated sac, and extends along the neutral arms of the visceral mass; an important part of the digestive system [ 38 , 39 ].…”

“…The crystalline structure is the principal organ of extracellular digestion, which is rotated in its sac by cilia, which head projects into the stomach and grinds against part of the chitinous gastric shield lined stomach wall. Chitinase activity has been detected in the crystalline structure of the American oyster Crassostrea virginica [ 16 ]. In other respects, two genes encoding the chitinase protein and chitinase-like protein had been characterized with their cDNAs from the oyster Crassostrea gigas , but both of them functioned on the immunity [ 17 , 18 ].…”