Hirondellea species are common inhabitants in the hadal region deeper than 7,000 m. We found that Hirondellea gigas thrived in the Challenger Deep possessed polysaccharide hydrolases as digestive enzymes. To obtain various enzymes of other H. gigas, we captured amphipods from the Japan Trench, and Izu-Ogasawara (Bonin) Trench. A phylogenetic analysis based on the cytochrome oxidase I gene showed close relationships among amphipods, despite the geographic distance between the localities. However, several differences in enzymatic properties were observed in these H. gigas specimens. We also carried out RNA sequencing of H. gigas from the Izu-Ogasawara Trench. The cellulase gene of H. gigas was highly homologous to cellobiohydrolase of Glucosyl Hydrolase family 7 (GH7). On the other hand, enzymatic properties of H. gigas's cellulase were different from those of typical GH7 cellobiohydrolase. Thus, these results indicate that hadal-zone amphipod can be good candidates as the new enzyme resource.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1080/09168451.2018.1459178 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Occurrence of polybrominated diphenyl ethers and benzotriazole UV stabilizers in the hadal amphipod .
iScience
July 2023
RZSS WildGenes, Royal Zoological Society of Scotland, Edinburgh EH12 6TS, UK.
The accumulation of polybrominated diphenyl ethers (PBDEs) and benzotriazole UV stabilizers (BZT-UVs) were examined in the hadal amphipod caught from a near-land trench off the Japan island (9200 m). were collected from two distinct sites: one is located at the outlet of submarine canyons directly connected to land and the other is apart from the outlet and geographically isolated from the first site. The level of the PBDEs in at the canyon outlet (mean 219 ng/g lipid weight (l.
View Article and Find Full Text PDFLarge effective population size masks population genetic structure in Hirondellea amphipods within the deepest marine ecosystem, the Mariana Trench.
Mol Ecol
May 2023
Minderoo-UWA Deep-Sea Research Centre, School of Biological Sciences and Oceans Institute, The University of Western Australia, Perth, Western Australia, Australia.
The examination of genetic structure in the deep-ocean hadal zone has focused on divergence between tectonic trenches to understand how environment and geography may drive species divergence and promote endemism. There has been little attempt to examine localized genetic structure within trenches, partly because of logistical challenges associated with sampling at an appropriate scale, and the large effective population sizes of species that can be sampled adequately may mask underlying genetic structure. Here we examine genetic structure in the superabundant amphipod Hirondellea gigas in the Mariana Trench at depths of 8126-10,545 m.
View Article and Find Full Text PDFUnusual bromine enrichment in the gastric mill and setae of the hadal amphipod Hirondellea gigas.
PLoS One
August 2022
Institute for Extra-cutting-edge Science and Technology Avant-garde Research (X-STAR), Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Yokosuka, Kanagawa, Japan.
The hadal amphipod Hirondellea gigas is an emblematic animal of the Pacific trenches, and has a number of special adaptations to thrive in this 'extreme' environment, which includes the deepest part of the Earth's ocean. One such adaptation that has been suggested is the presence of an 'aluminum gel shield' on the surface of its body in order to prevent the dissolution of calcitic exoskeleton below the carbonate compensation depth. However, this has not been investigated under experimental conditions that sufficiently prevent aluminum artefacts, and the possibility of other elements with similar characteristic X-ray energy as aluminum (such as bromine) has not been considered.
View Article and Find Full Text PDFGut Microbial Divergence Between Three Hadal Amphipod Species from the Isolated Hadal Trenches.
Microb Ecol
August 2022
Shanghai Engineering Research Center of Hadal Science & Technology, College of Marine Sciences, Shanghai Ocean University, Shanghai, 201306, China.
Amphipods are the dominant scavenging metazoan species in the hadal trenches at water depths below 6,000 m. The gut microbiota have been considered to be contribution to the adaptation of deep-sea organisms; however, few comparative analyses of animal gut microbiota between different isolated hadal environments have been done so far. Here, we employed high-throughput 16S rRNA sequencing to compare the gut microbial taxonomic composition and functional potential diversity of three hadal amphipod species, Hirondellea gigas, Bathycallisoma schellenbergi, and Alicella gigantea, collected from the Mariana Trench, Marceau Trench, and New Britain Trench in the Pacific Ocean, respectively.
View Article and Find Full Text PDFMetagenomic Insights Into the Structure and Function of Intestinal Microbiota of the Hadal Amphipods.
Front Microbiol
June 2021
Key Laboratory of Sustainable Exploitation of Oceanic Fisheries Resources, Ministry of Education, College of Marine Sciences, Shanghai Ocean University, Shanghai, China.
Hadal trenches are the deepest known areas of the ocean. Amphipods are considered to be the dominant scavengers in the hadal food webs. The studies on the structure and function of the hadal intestinal microbiotas are largely lacking.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!