Utilization Collaborative Innovation Center

Guangzhou, China

Utilization Collaborative Innovation Center

Guangzhou, China
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Wang P.,University of Economic Sciences | Wang P.,CAS South China Sea Fisheries Research Institute | Wang P.,Utilization Collaborative Innovation Center | Xu P.,University of Economic Sciences | And 7 more authors.
Israeli Journal of Aquaculture - Bamidgeh | Year: 2017

HSP60 protein plays an important role in stress response, protein folding, and cell signaling. In this study, mitochondrial HSP60 from Siniperca chuatsi was identified, and its cDNA and gDNA structures, amino acid sequence features, and phylogenetic analysis, were described. Expression profiles during embryonic development, in different tissues and under stressful conditions were analyzed using RT-PCR. During embryogenesis, low levels of transcripts of ScHSP60 were detected during early developmental stages and were upregulated at blastopore closure stages to 1 dpf. ScHSP60 showed tissue-specific variation, highly expressed in ovaries under non-stressed conditions. Acute heat shock at 34°C resulted in strong upregulation of ScHSP60 in heart, liver, and head kidney in a time-dependent manner. However rapid and gradual elevated heat shock did not affect ScHSP60 expression when temperature reached 34°C, although it was dramatically induced when temperature reached 38.8°C. ScHSP60 was also markedly induced in the liver in a stage-dependent manner under hypoxia. Additionally, Aeromonas hydrophila infection augmented ScHSP60 in head kidney and spleen. Results showed that ScHSP60 expression is significantly modified under different environmental conditions including high temperatures, hypoxia, and bacterial infection. This study will further clarify the role of fish HSP60 in embryogenesis and under stressful conditions, and contribute to further investigation to understand stress tolerance and disease resistance of mandarin fish. © 2017, Israeli Journal of Aquaculture - Bamidgeh. All rights reserved.

Yan X.,Xiamen University | Tang X.-X.,State Oceanic Administration | Tang X.-X.,Utilization Collaborative Innovation Center | Qin D.,Chinese Institute of Urban Environment | And 5 more authors.
Marine Drugs | Year: 2016

This work investigated the metabolites and their biosynthetic functional hydroxylase genes of the deep-sea sediment metagenomic clone 25D7. 5-Bromoindole was added to the 25D7 clone derived Escherichia coli fermentation broth. The new-generated metabolites and their biosynthetic byproducts were located through LC-MS, in which the isotope peaks of brominated products emerged. Two new brominated bis-indole metabolites, 5-bromometagenediindole B (1), and 5-bromometagenediindole C (2) were separated under the guidance of LC-MS. Their structures were elucidated on the basis of 1D and 2D NMR spectra (COSY, HSQC, and HMBC). The biosynthetic functional genes of the two new compounds were revealed through LC-MS and transposon mutagenesis analysis. 5-Bromometagenediindole B (1) also demonstrated moderately cytotoxic activity against MCF7, B16, CNE2, Bel7402, and HT1080 tumor cell lines in vitro. © 2016 by the authors; licensee MDPI, Basel, Switzerland.

Xu F.,CAS South China Sea Institute of Oceanology | Xu F.,University of Chinese Academy of Sciences | Xu F.,Guangdong Laboratory Animals Monitoring Institute | Li J.,CAS South China Sea Institute of Oceanology | And 8 more authors.
Fish and Shellfish Immunology | Year: 2015

Inhibitor of NF-κB (IκB), the important regulator of NF-κB/Rel signaling pathway, plays the crucial role in immune response of both vertebrates and invertebrates. Here, a novel homologue of IκB was cloned from Crassostrea gigas, and designated as CgIκB3. The complete CgIκB3 cDNA was 1282 bp in length, including a 942 bp open reading frame (ORF), a 51 bp 5' UTR and a 289 bp 3' UTR. The ORF encodes a putative protein of 313 amino acids with a predicted molecular weight of approximately 34.7 kDa. Sequence analysis reveals that CgIκB3 contains a conserved degradation motif but with only five ankyrin repeats. Neither a PEST domain nor a C-terminal casein kinase II phosphorylation site was identified through either alignment or bioinformatic prediction. Phylogenetic analysis suggested that CgIκB3 shares common ancestor with CgIκB1 rather CgIκB2, and theoretically it may originate from one duplication event prior to divergence of CgIκB1 and CgIκB2. Tissue expression analyses demonstrated that CgIκB3 mRNA is the most abundant in gills and heart. The expression following PAMP infection showed that CgIκB3 was significantly up-regulated in a similar pattern when challenged with LPS, HKLM or HKVA, respectively. Moreover, similar to CgIκB1 and CgIκB2, CgIκB3 can also inhibit Rel dependent NF-κB activation in HEK293 cells in a dose-dependent manner. In summary, these findings suggest that CgIκB3 can be as the functional inhibitor of NF-κB/Rel and involved in the host defense of C. gigas. The discovery of the third IκB emphasizes the complexity and importance of the regulation on NF-κB activation. © 2015 Elsevier Ltd.

Gao B.,Xiamen University | Jin M.,Third Institute of Oceanography | Li L.,Third Institute of Oceanography | Qu W.,Xiamen University | And 3 more authors.
Frontiers in Microbiology | Year: 2017

Flammeovirga pacifica strain WPAGA1 is a Gram-negative, polysaccharide-degrading bacterium isolated from the marine sediment of the West Pacific Ocean. This strain is a cosmopolitan marine bacterium that uses complex polysaccharides as exclusive source of carbon and energy and plays a key role in the marine carbon cycle. Genome sequence analysis of strain WPAGA1 revealed that the assembled fine genome contains 6,610,326 bp with 32.89% G+C content, 5036 open reading frames (ORFs) and abundant genomic elements. Amongst these ORFs, 1022 genes encoding carbohydrate enzymes were found in the F. pacifica WPAGA1 genome. In addition, abundant putative enzymes involved in degrading polysaccharide were found. These enzymes include amylase, xylosidase, cellulase, alginate lyase, pectate lyase, rhamnogalacturonan lyase, chitinase, carrageenase, heparinase and fucosidase. To further investigate the use of these polysaccharides in strain WPAGA1, a schematic of various polysaccharide-degrading metabolic pathways were deduced from the genome sequence. This study showed that strain WPAGA1 may serve as a potential candidate for research of glycometabolism and have potential biotechnological and industrial applications and play key roles in the marine carbon cycle. © 2017 Gao, Jin, Li, Qu and Zeng.

Liu Y.,Sun Yat Sen University | Liu Y.,Guangdong Ocean University | Wu Y.,Sun Yat Sen University | Zhai R.,Sun Yat Sen University | And 4 more authors.
RSC Advances | Year: 2016

Five new altenusin derivatives, compounds 1-5, along with six known analogues 6-11, were isolated from a culture of the endophytic fungus Alternaria sp. SK6YW3L, which was isolated from a fresh fruit of the mangrove plant Sonneratia caseolaris, collected from the South China Sea. Their structures were elucidated by analysis of 1D and 2D NMR and high resolution mass spectroscopic data. The absolute configurations of compounds 1-3 and 5 were assigned by quantum chemical calculations of the electronic circular dichroic (ECD) spectra. Structures of compounds 1 and 4 were further confirmed by single-crystal X-ray diffraction experiments using Cu Kα radiation. All isolated compounds were evaluated for α-glucosidase inhibitory activity, and compounds 2, 3 and 9 exhibited moderate inhibitory activity. The plausible biosynthetic pathways for all the compounds were proposed. © 2016 The Royal Society of Chemistry.

Zhou G.,Third Institute of Oceanography | Jin M.,Third Institute of Oceanography | Cai Y.,Inspection and Quarantine Technology Center | Zeng R.,Third Institute of Oceanography | Zeng R.,Utilization Collaborative Innovation Center
International Journal of Biological Macromolecules | Year: 2015

A thermostable α-amylase (designated as Amy16) has been previously identified in Flammeovirga pacifica isolated from deep-sea sediments. The DNA sequence of Amy16 exhibited no significant similarity with those of any known protein, including the glycoside hydrolases. Amino acid sequence analysis revealed that Amy16 belonged to GH13 family and possessed a conserved DXEXD motif, which was essential for its hydrolysis activities. The recombinant Amy16 purified with Ni+ affinity column after its heterologous expression in Escherichia coli cells was most active at 50°C and retained more than 81% of its initial activity after incubation at 60°C for 20min. The optimal pH for Amy16 was determined to be 6.5, and a good tolerance to alkaline environment was observed. Low concentration of Mg2+, Sr2+, Na+ and K+ slightly increased the activity of Amy16. Results of thin layer chromatography experiments revealed that Amy16 was able to hydrolyse starch into maltose in a time-dependent manner, suggesting that Amy16 is a liquid-type endoenzyme with starch hydrolysis activities. Therefore, our study presented thermostable and alkali-stable Amy16, which may be suitable for use as an additive in detergents. © 2015 Elsevier B.V.

Li Q.,Ningbo University | Li Q.,State Oceanic Administration | Li Q.,Utilization Collaborative Innovation Center | Ao J.,State Oceanic Administration | And 11 more authors.
Fish and Shellfish Immunology | Year: 2015

Two cysteine proteases, cathepsin S (CatS) and cathepsin L (CatL), have been identified as the key enzymes involved in the processing of invariant chain (Ii chain) in mammals. However, little is known about the roles of fish cathepsins in the Ii chain processing. In this study, large yellow croaker cathepsin S (LycCatS) and L (LycCatL) were identified and characterized. Based on the sequence comparison and phylogenetic analysis, both LycCatS and LycCatL are highly conserved to their counterparts in teleost. These two cathepsins were constitutively expressed in all tissues and immune-related cells tested, although at different levels. Both recombinant LycCatS (rLycCatS) and LycCatL (rLycCatL) possess the typical cysteine protease activity. Like other mammalian endopeptidase cathepsins, rLycCatS and rLycCatL could be autocatalytically activated to remove propeptides and release active mature peptides. On the other hand, the autocatalytic activation of rLycCatL could be inhibited by recombinant large yellow croaker Ii chain (rLyc-TR-Ii), but the autocatalytic activation of rLycCatS was not affected by rLyc-TR-Ii. Furthermore, the activated rLycCatS can efficiently process rLyc-TR-Ii in a stepwise manner in vitro, while the activated rLycCatL can not. These data indicate that cathepsin S may be the main cathepsin involved in the Ii chain processing in bony fish. © 2015 Elsevier Ltd.

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