A comparative study of amylases and proteinases in some decapod crustacea

Sather, Bryant T.

doi:10.1016/0010-406x(69)91350-4

Cited by 35 publications

(10 citation statements)

References 13 publications

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“…Two optimal pHs for the total protease observed in M. australiense (at pH 4.0 and 8.0) might indicate the presence of an endopeptidase that possesses a catheptic and a tryptic action as suggested by Degkwitz (1957) and Sather (1969). The term ‘catheptic’ is used to characterize an intracellular protease of animal origin, which is active at weak acid pH.…”

Section: Discussionmentioning

confidence: 98%

“…Omnivores and detritivores are in an intermediate position, showing a wide range and concentration of both protease and carbohydrase (Sather 1969; Lee, Smith & Lawrence 1984). An understanding of which digestive enzymes act in response to given dietary components is an important tool that can clarify specific aspects of the crustacean's nutritional requirements and might help in the formulation of efficient diets.…”

Section: Introductionmentioning

confidence: 99%

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Digestive enzyme spectra in crustacean decapods (Paleomonidae, Portunidae and Penaeidae) feeding in the natural habitat

Figueiredo

Anderson

2009

Aquaculture Research

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This work describes the pro¢le of ¢ve proteases and four carbohydrases from the crustacean decapods Macrobrachium australiense (Holthuis), Scylla serrata (Forskal), Portunus pelagicus (Linnaeus), Penaeus esculentus, Penaeus plebejus (Hess) and Metapenaeus bennettae (Racck & Dall), feeding in the natural habitat, in order to provide an indication of their digestive capabilities. The results raised the following points. First, species from each family showed a particular suite of digestive enzymes. Second, the activity of cellulase from M. australiensis and S. serrata, using AZCL-HE cellulose as the substrate, was around 90% higher than that observed with AZO-CM cellulose. However, for P. pelagicus and P. esculentus, the enzyme activity was better with AZO-CM cellulose. Third, M. australiense displayed the highest ratio of amylase to protease activity. In contrast, Portunidae species, P. pelagicus and S. serrata showed the lowest ratios. Fourth, comparison of the laminarinase activity of M. bennettae and P. esculentus in October (Spring) and December (early Summer) showed a sig-ni¢cant decrease in December. Finally, the wide distribution of digestive enzymes in these crustaceans may re£ect di¡erent feeding habits and habitats.

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Section: Discussionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Digestive enzyme spectra in crustacean decapods (Paleomonidae, Portunidae and Penaeidae) feeding in the natural habitat

Figueiredo

Anderson

2009

Aquaculture Research

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“…DeVillez (1965) reported a peak of prot~a8e activity at pH 6.0 using gastric juice extracts from the crayfish Orconectea vir!lis. Sather (1969) found two peaks of digestive protease activity, at pH 5.6 and pH 7.9, in the crab -118- As shown in Fig . 4.5, the activity of lobster protease increased with temperature from 25° to sooe at pH 5.…”

Section: Values Expressed Are Mean±8tandard Deviation (0=3)mentioning

confidence: 87%

“…Van Wee1 (1959 showed that a continued high protein diet caused a suppression of protease activity in snails. During a study on the amylase and proteinases of decapods t Sather (1969) A recent hypothesis states that zooplankton acclimate to ambient food concentrations such that higher digestive enzyme activities and higher maximum ingestion rates occur at higher food levels (Paulett 1974;Mayzaud and Conover, 1976;Mayzaud and Pou1et, 1978;Birche, 1981).…”

Section: Review Of the Literature: Digestive Enzymes Of Marine Invertmentioning

confidence: 99%

Changes in midgut gland morphology and digestive enzyme activities associated with development in early stages of the American lobster Homarus americanus

Biesiot¹

1986

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“…For example, many of the carbohydrate-degrading enzymes are correlated positively with dietary carbohydrate level in fish, birds, and mammals (246), crustaceans (235, 236, 389), oligochaetes (110), and possibly insects (94). Although in total these studies are consistent with the adaptational hypotheses, a number of features of the studies in the past decade strengthen the analysis, and we will focus on these studies in the paragraphs that follow.…”

Section: Catalytic Chemical Breakdown By Intrinsic Enzymesmentioning

confidence: 99%

Comparative Digestive Physiology

Karasov

Douglas

2013

Comprehensive Physiology

261

221

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In vertebrates and invertebrates, morphological and functional features of gastrointestinal (GI) tracts generally reflect food chemistry, such as content of carbohydrates, proteins, fats, and material(s) refractory to rapid digestion (e.g., cellulose). The expression of digestive enzymes and nutrient transporters approximately matches the dietary load of their respective substrates, with relatively modest excess capacity. Mechanisms explaining differences in hydrolase activity between populations and species include gene copy number variations and single-nucleotide polymorphisms. Transcriptional and posttranscriptional adjustments mediate phenotypic changes in the expression of hydrolases and transporters in response to dietary signals. Many species respond to higher food intake by flexibly increasing digestive compartment size. Fermentative processes by symbiotic microorganisms are important for cellulose degradation but are relatively slow, so animals that rely on those processes typically possess special enlarged compartment(s) to maintain a microbiota and other GI structures that slow digesta flow. The taxon richness of the gut microbiota, usually identified by 16S rRNA gene sequencing, is typically an order of magnitude greater in vertebrates than invertebrates, and the interspecific variation in microbial composition is strongly influenced by diet. Many of the nutrient transporters are orthologous across different animal phyla, though functional details may vary (e.g., glucose and amino acid transport with K+ rather than Na+ as a counter ion). Paracellular absorption is important in many birds. Natural toxins are ubiquitous in foods and may influence key features such as digesta transit, enzymatic breakdown, microbial fermentation, and absorption

show abstract

A comparative study of amylases and proteinases in some decapod crustacea

Cited by 35 publications

References 13 publications

Digestive enzyme spectra in crustacean decapods (Paleomonidae, Portunidae and Penaeidae) feeding in the natural habitat

Digestive enzyme spectra in crustacean decapods (Paleomonidae, Portunidae and Penaeidae) feeding in the natural habitat

Changes in midgut gland morphology and digestive enzyme activities associated with development in early stages of the American lobster Homarus americanus

Comparative Digestive Physiology

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