TL;DR: Resact acts as a chemoattractant for Arbacia punctulata and speract promotes the acrosome reaction of Hemicentrotus pulcherrimus spermatozoa as a cofactor.
Abstract: Speract (Gly-Phe-Asp-Leu-Asn-Gly-Gly-Gly-Val-Gly) and ten of its derivatives obtained from the egg jelly of sea urchins, Order Echinoida, stimulate the respiration and motility of spermatozoa of sea urchins belonging to the same order. Resact (Cys-Val-Thr-Gly-Ala-Pro-Gly-Cys-Val-Gly-Gly-Gly-Arg-LeuNH2) and mosact (Asp-Ser-Asp-Ser-Ala-Gln-Asn-Leu-Ile-Gly) and two of its derivatives obtained from Arbacia punctulata eggs, Order Arbacioida, and Clypeaster japonicus eggs, Order Clypeasteroida, also stimulate the metabolism and motility of respective sea urchin spermatozoa. Two other peptides (Gly-(X)-Pro-(X)-Gly-Gly-Ala-Val- and Open image in new window ) were isolated from the egg jelly of the sea urchin Diadema setosum, Order Diadematoida. These are specific for Diadema setosum spermatozoa. Early biochemical responses of the spermatozoa to the egg jelly peptides include at a net hydrogen ion efflux and elevations of cyclic AMP and cyclic GMP concentrations. In additoin, a major sperm plasma protein is modified in response to the peptides such that its apparent molecular weight is lowered with exception of the response of Glyptocidaris crenularis spermatozoa to alloresact (Lys-Leu-Cys-Pro-Gly-Gly-Asn-Cys-Val). The plasma membrane protein appears to be the enzyme guanylate cyclase. Resact acts as a chemoattractant for Arbacia punctulata and speract promotes the acrosome reaction of Hemicentrotus pulcherrimus spermatozoa as a cofactor.
TL;DR: The present paper shows the first biochemical and proteomic characterization of the test matrix of the Mediterranean black sea urchin Arbacia lixula (Arbacioida), and suggest that large-scale proteomic screening should be performed in order to understand which molecular functions related to calcification are conserved and which ones have been co-opted for biomineralization in particular lineages.
TL;DR: The carotenoid patterns of (I), which is the most primitive sea-urchin from the phylogenetic point of view, and of (II) which is direct developers with non-feeding larvae, were quite different from those of the otherSea-urchins showing typical development with feeding larvae.
Abstract: 1.
1. The carotenoids of seven species of more primitive sea-urchins, [orders Cidaroida (I), Echinothurioida (II), Diadematoida (III), and Arbacioida (IV)] were investigated from the comparative biochemical point of view.
2.
2. β,β-carotene and β-echinenone have been isolated as major carotenoids in (I) and (III, IV), respectively. In (II), β,β-carotene, β-echinenone, canthaxanthin and (3S,3′S)-astaxanthin were foundto be predominant carotenoids.
3.
3. The carotenoid patterns of (I) which is the most primitive sea-urchin from the phylogenetic point of view, and of (II) which is direct developers with non-feeding larvae, were quite different from those of the other sea-urchins showing typical development with feeding larvae.
TL;DR: Protein polymorphism and genetic relationship were investigated in two sea-urchin species, Glyptocidaris crenularis and Stomopneustes variolaris belonging to the order Arbacioida by enzyme electrophoresis, suggesting that the two species have the more recent evolutionary origin.
Abstract: Abstract 1. 1. Protein polymorphism and genetic relationship were investigated in two sea-urchin species, Glyptocidaris crenularis and Stomopneustes variolaris belonging to the order Arbacioida by enzyme electrophoresis. 2. 2. The degree of genetic variation was comparable to that observed in many other echinoderms from shallow water, but was considerably lower than that from deep-sea water. The glucose metabolizing enzymes were on average less variable than the non-glucose enzymes. 3. 3. Nei's genetic distance between the two species of the different families was 1.417, and comparable to the D values between closely related families of the order Echinoida. This suggests that the two species have the more recent evolutionary origin.
TL;DR: In this paper, protein polymorphism and genetic relationship were investigated in two sea-urchin species, Glyptocidaris crenularis and Stomopneustes variolaris belonging to the order Arbacioida by enzyme electrophoresis.
Abstract: 1. 1. Protein polymorphism and genetic relationship were investigated in two sea-urchin species, Glyptocidaris crenularis and Stomopneustes variolaris belonging to the order Arbacioida by enzyme electrophoresis. 2. 2. The degree of genetic variation was comparable to that observed in many other echinoderms from shallow water, but was considerably lower than that from deep-sea water. The glucose metabolizing enzymes were on average less variable than the non-glucose enzymes. 3. 3. Nei's genetic distance between the two species of the different families was 1.417, and comparable to the D values between closely related families of the order Echinoida. This suggests that the two species have the more recent evolutionary origin.