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Asiri F. Polyhydroxyalkanoates for Sustainable Aquaculture: A Review of Recent Advancements, Challenges, and Future Directions. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2024; 72:2034-2058. [PMID: 38227436 DOI: 10.1021/acs.jafc.3c06488] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/17/2024]
Abstract
Polyhydroxyalkanoates (PHA) are biodegradable biopolymers produced by prokaryotic microbes, which, at the same time, can be applied as single-cell proteins (SCPs), growing on renewable waste-derived substrates. These PHA polymers have gained increasing attention as a sustainable alternative to conventional plastics. One promising application of PHA and PHA-rich SCPs lies within the aquaculture food industry, where they hold potential as feed additives, biocontrol agents against diseases, and immunostimulants. Nevertheless, the cost of PHA production and application remains high, partly due to expensive substrates for cultivating PHA-accumulating SCPs, costly sterilization, energy-intensive SCPs harvesting techniques, and toxic PHA extraction and purification processes. This review summarizes the current state of PHA production and its application in aquaculture. The structure and classification of PHA, microbial sources, cultivation substrates, biosynthesis pathways, and the production challenges and solutions are discussed. Next, the potential of PHA application in aquaculture is explored, focusing on aquaculture challenges, common and innovative PHA-integrated farming practices, and PHA mechanisms in inhibiting pathogens, enhancing the immune system, and improving growth and gut health of various aquatic species. Finally, challenges and future research needs for PHA production and application in aquaculture are identified. Overall, this review paper provides a comprehensive overview of the potential of PHA in aquaculture and highlights the need for further research in this area.
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Affiliation(s)
- Fahad Asiri
- Environment & Life Sciences Research Center, Kuwait Institute for Scientific Research, P.O. Box 24885, Safat 13109, Kuwait
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Asiri F, Chu KH. Valorization of agro-industrial wastes into polyhydroxyalkanoates-rich single-cell proteins to enable a circular waste-to-feed economy. CHEMOSPHERE 2022; 309:136660. [PMID: 36191769 DOI: 10.1016/j.chemosphere.2022.136660] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/04/2022] [Revised: 09/26/2022] [Accepted: 09/27/2022] [Indexed: 06/16/2023]
Abstract
Recovering and converting carbon and nutrients from waste streams into healthy single-cell proteins (SCPs) can be an effective strategy to address costly waste management and support the increasing animal feed demand for the global food supply. Recently, SCPs rich in polyhydroxybutyrate (PHB) have been identified as an effective biocontrol healthy feed to replace conventional antibiotics-supplemented aquaculture feed. PHB, an intercellular polymer of short-chain-length (SCL) hydroxy-fatty acids, is a common type of polyhydroxyalkanoates (PHA) that can be microbially produced from various organics, including agro-industrial wastes. The complex chemical properties of agro-industrial wastes might produce SCPs containing PHA with SCL and/or medium chain-length (MCL) hydroxy-fatty acids. However, the effects of MCL-PHA-containing SCPs on aqua species' health and disease-fighting ability remains poorly understood. This study investigated the feasibility of producing various PHA-containing SCPs from renewable agro-industrial wastes/wastewaters, the effectiveness of SCL- and MCL-PHA as biocontrol agents, and the effects of these PHA-rich SCPs on the growth and disease resistance of an aquaculture animal model, brine shrimp Artemia. Zobellella denitrificans ZD1 and Pseudomonas oleovorans were able to grow on different pure substrates and agro-industrial wastes/wastewaters to produce various SCL- and/or MCL-PHA-rich SCPs. Low doses of MCL-fatty acids (i.e., PHA intermediates) efficiently suppressed the growth of aquaculture pathogens. Moreover, MCL-PHA-rich SCPs served as great food/energy sources for Artemia and improved Artemia's ability to fight pathogens. This study offers a win-win approach to address the challenges of wastes/wastewater management and feed supply faced by the aquaculture industry.
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Affiliation(s)
- Fahad Asiri
- Zachry Department of Civil and Environmental Engineering, Texas A&M University, 3136 TAMU, College Station, TX 77843-3136, USA; Environment & Life Sciences Research Center, Kuwait Institute for Scientific Research, P.O. Box 24885, Safat, 13109, Kuwait
| | - Kung-Hui Chu
- Zachry Department of Civil and Environmental Engineering, Texas A&M University, 3136 TAMU, College Station, TX 77843-3136, USA.
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Fukami K, Takagi F, Sonoda K, Okamoto H, Kaneno D, Horikawa T, Takita M. Effects of the Monomeric Components of Poly-hydroxybutyrate-co-hydroxyhexanoate on the Growth of Vibrio penaeicida In Vitro and on the Survival of Infected Kuruma Shrimp ( Marsupenaeus japonicus). Animals (Basel) 2021; 11:ani11020567. [PMID: 33671683 PMCID: PMC7926579 DOI: 10.3390/ani11020567] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/25/2020] [Revised: 02/18/2021] [Accepted: 02/18/2021] [Indexed: 11/16/2022] Open
Abstract
Here, we investigated the inhibitory effects of the biodegradable, water-insoluble polymer poly-hydroxybutyrate-co-hydroxyhexanoate (PHBH) and its two constituent monomers, the hydroxyalkanoic acids 3-hydroxybutyrate (3HB) and 3-hydroxyhexanoate (3HH), on the growth of the shrimp-pathogenic bacterium Vibrio penaeicida. In vitro experiments revealed that 3HH showed greater growth inhibitory activity than 3HB against V. penaeicida. In addition, the activities of hydroxyalkanoic acids were pH dependent, being greater at pH 6.0 than at pH 7.0. Investigation of the pH of the shrimp gut revealed a pH range of 5.9-6.7 (mean 6.29 ± SD 0.20), indicating that the physiological environment was suitable for 3HB and 3HH to exert their inhibitory activities against V. penaeicida. In vivo bacterial challenge experiments revealed that survival rates in kuruma shrimp (Marsupenaeus japonicus) infected by V. penaeicida were significantly increased in shrimp reared on feed containing PHBH (0.1%-5% w/w PHBH) compared with that in shrimp reared on standard diet alone. Supplementation with PHBH had no significant effects on three shrimp growth parameters: increase in body weight, daily feeding rate, and feed conversion ratio. These results suggest that supplementation of standard diet with PHBH will increase shrimp resistance to infection by V. penaeicida, thereby increasing shrimp aquaculture productivity.
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Affiliation(s)
- Kimio Fukami
- Faculty of Agriculture and Marine Science, Kochi University, Nankoku-Shi, Kochi 783-8502, Japan; (F.T.); (D.K.)
- Correspondence: ; Tel.: +81-843-4864
| | - Fumika Takagi
- Faculty of Agriculture and Marine Science, Kochi University, Nankoku-Shi, Kochi 783-8502, Japan; (F.T.); (D.K.)
| | - Kohei Sonoda
- HIGAHIMARU CO., Ltd. Ichikikushikino-Shi, Kagoshima 896-0046, Japan; (K.S.); (H.O.)
| | - Hiroshi Okamoto
- HIGAHIMARU CO., Ltd. Ichikikushikino-Shi, Kagoshima 896-0046, Japan; (K.S.); (H.O.)
| | - Daisuke Kaneno
- Faculty of Agriculture and Marine Science, Kochi University, Nankoku-Shi, Kochi 783-8502, Japan; (F.T.); (D.K.)
| | - Takao Horikawa
- Kaneka Corporation, Nakanoshima, Osaka 530-8288, Japan; (T.H.); (M.T.)
| | - Masaki Takita
- Kaneka Corporation, Nakanoshima, Osaka 530-8288, Japan; (T.H.); (M.T.)
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Wang X, Jiang X, Wu F, Ma Y, Che X, Chen X, Liu P, Zhang W, Ma X, Chen G. Microbial Poly‐3‐Hydroxybutyrate (PHB) as a Feed Additive for Fishes and Piglets. Biotechnol J 2019; 14:e1900132. [PMID: 31119892 DOI: 10.1002/biot.201900132] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2019] [Revised: 05/13/2019] [Indexed: 12/20/2022]
Affiliation(s)
- Xuan Wang
- School of Life Sciences, Tsinghua‐Peking Center for Life Sciences, Center for Synthetic and Systems BiologyTsinghua UniversityBeijing 100084 China
| | - Xiao‐Ran Jiang
- School of Life Sciences, Tsinghua‐Peking Center for Life Sciences, Center for Synthetic and Systems BiologyTsinghua UniversityBeijing 100084 China
| | - Fuqing Wu
- School of Life Sciences, Tsinghua‐Peking Center for Life Sciences, Center for Synthetic and Systems BiologyTsinghua UniversityBeijing 100084 China
- Center for Nano and Micro‐MechanicsTsinghua UniversityBeijing 100084 China
- MOE Key Lab for Industrial BiocatalysisTsinghua UniversityBeijing 100084 China
| | - Yiming Ma
- School of Life Sciences, Tsinghua‐Peking Center for Life Sciences, Center for Synthetic and Systems BiologyTsinghua UniversityBeijing 100084 China
- Center for Nano and Micro‐MechanicsTsinghua UniversityBeijing 100084 China
| | - Xuemei Che
- School of Life Sciences, Tsinghua‐Peking Center for Life Sciences, Center for Synthetic and Systems BiologyTsinghua UniversityBeijing 100084 China
- Center for Nano and Micro‐MechanicsTsinghua UniversityBeijing 100084 China
| | - Xiyue Chen
- State Key Laboratory of Animal NutritionChina Agricultural UniversityNo. 2 Yuanmingyuan West Road Beijing 100193 China
| | - Ping Liu
- State Key Laboratory of Animal NutritionChina Agricultural UniversityNo. 2 Yuanmingyuan West Road Beijing 100193 China
| | - Wenbing Zhang
- The Key Laboratory of Aquaculture Nutrition and Feeds, Ministry of Agriculture, The Key Laboratory of Mariculture (Ministry of Education)Ocean University of ChinaQingdao 266003 China
| | - Xi Ma
- State Key Laboratory of Animal NutritionChina Agricultural UniversityNo. 2 Yuanmingyuan West Road Beijing 100193 China
| | - Guo‐Qiang Chen
- School of Life Sciences, Tsinghua‐Peking Center for Life Sciences, Center for Synthetic and Systems BiologyTsinghua UniversityBeijing 100084 China
- Center for Nano and Micro‐MechanicsTsinghua UniversityBeijing 100084 China
- MOE Key Lab for Industrial BiocatalysisTsinghua UniversityBeijing 100084 China
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Van Hung N, Bossier P, Hong NTX, Ludeseve C, Garcia-Gonzalez L, Nevejan N, De Schryver P. Does Ralstonia eutropha, rich in poly-β hydroxybutyrate (PHB), protect blue mussel larvae against pathogenic vibrios? JOURNAL OF FISH DISEASES 2019; 42:777-787. [PMID: 30850999 DOI: 10.1111/jfd.12981] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/23/2018] [Revised: 01/23/2019] [Accepted: 01/25/2019] [Indexed: 06/09/2023]
Abstract
The natural amorphous polymer poly-β-hydroxybutyrate (PHB-A: lyophilized Ralstonia eutropha containing 75% PHB) was used as a biological agent to control bacterial pathogens of blue mussel (Mytilus edulis) larvae. The larvae were supplied with PHB-A at a concentration of 1 or 10 mg/L for 6 or 24 hr, followed by exposure to either the rifampicin-resistant pathogen Vibrio splendidus or Vibrio coralliilyticus at a concentration of 105 CFU/ml. Larvae pretreated 6 hr with PHB-A (1 mg/L) survived a Vibrio challenge better relative to 24 hr pretreatment. After 96 hr of pathogen exposure, the survival of PHB-A-treated mussel larvae was 1.41- and 1.76-fold higher than the non-treated larvae when challenged with V. splendidus and V. coralliilyticus, respectively. Growth inhibition of the two pathogens at four concentrations of the monomer β-HB (1, 5, 25 and 125 mM) was tested in vitro in LB35 medium, buffered at two different pH values (pH 7 and pH 8). The highest concentration of 125 mM significantly inhibited the pathogen growth in comparison to the lower levels. The effect of β-HB on the production of virulence factors in the tested pathogenic Vibrios revealed a variable pattern of responses.
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Affiliation(s)
- Nguyen Van Hung
- Laboratory of Aquaculture & Artemia Reference Center, Ghent University, Ghent, Belgium
- Research Institute for Aquaculture No.3, Nhatrang, Vietnam
| | - Peter Bossier
- Laboratory of Aquaculture & Artemia Reference Center, Ghent University, Ghent, Belgium
| | - Nguyen Thi X Hong
- Laboratory of Aquaculture & Artemia Reference Center, Ghent University, Ghent, Belgium
| | - Christine Ludeseve
- Laboratory of Aquaculture & Artemia Reference Center, Ghent University, Ghent, Belgium
| | | | - Nancy Nevejan
- Laboratory of Aquaculture & Artemia Reference Center, Ghent University, Ghent, Belgium
| | - Peter De Schryver
- Laboratory of Aquaculture & Artemia Reference Center, Ghent University, Ghent, Belgium
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El Abbadi SH, Criddle CS. Engineering the Dark Food Chain. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2019; 53:2273-2287. [PMID: 30640466 DOI: 10.1021/acs.est.8b04038] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Meeting global food needs in the face of climate change and resource limitation requires innovative approaches to food production. Here, we explore incorporation of new dark food chains into human food systems, drawing inspiration from natural ecosystems, the history of single cell protein, and opportunities for new food production through wastewater treatment, microbial protein production, and aquaculture. The envisioned dark food chains rely upon chemoautotrophy in lieu of photosynthesis, with primary production based upon assimilation of CH4 and CO2 by methane- and hydrogen-oxidizing bacteria. The stoichiometry, kinetics, and thermodynamics of these bacteria are evaluated, and opportunities for recycling of carbon, nitrogen, and water are explored. Because these processes do not require light delivery, high volumetric productivities are possible; because they are exothermic, heat is available for downstream protein processing; because the feedstock gases are cheap, existing pipeline infrastructure could facilitate low-cost energy-efficient delivery in urban environments. Potential life-cycle benefits include: a protein alternative to fishmeal; partial decoupling of animal feed from human food; climate change mitigation due to decreased land use for agriculture; efficient local cycling of carbon and nutrients that offsets the need for energy-intensive fertilizers; and production of high value products, such as the prebiotic polyhydroxybutyrate.
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Affiliation(s)
- Sahar H El Abbadi
- Department of Civil and Environmental Engineering , Stanford University , Stanford , California 94305-4020 , United States
| | - Craig S Criddle
- Department of Civil and Environmental Engineering , Stanford University , Stanford , California 94305-4020 , United States
- William and Cloy Codiga Resource Recovery Center , Stanford University , Stanford , California 94305-4020 , United States
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Defoirdt T, Mai Anh NT, De Schryver P. Virulence-inhibitory activity of the degradation product 3-hydroxybutyrate explains the protective effect of poly-β-hydroxybutyrate against the major aquaculture pathogen Vibrio campbellii. Sci Rep 2018; 8:7245. [PMID: 29740008 PMCID: PMC5940922 DOI: 10.1038/s41598-018-25385-w] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2018] [Accepted: 04/19/2018] [Indexed: 11/23/2022] Open
Abstract
The bacterial storage compound poly-β-hydroxybutyrate, a polymer of the short-chain fatty acid 3-hydroxybutyrate, has been reported to protect various aquatic animals from bacterial disease. In order to obtain a better mechanistic insight, we aimed to (1) investigate whether 3-hydroxybutyrate is released from poly-β-hydroxybutyrate within sterile brine shrimp larvae, (2) determine the impact of 3-hydroxybutyrate on the virulence of Vibrio campbellii to brine shrimp larvae and on its cell density in the shrimp, and (3) determine the impact of this compound on virulence factor production in the pathogen. We detected 3-hydroxybutyrate in poly-β-hydroxybutyrate-fed brine shrimp, resulting in 24 mM 3-hydroxybutyrate in the intestinal tract of shrimp reared in the presence of 1000 mg l-1 poly-β-hydroxybutyrate. We further demonstrate that this concentration of 3-hydroxybutyrate does not affect the growth of V. campbellii, whereas it decreases the production of different virulence factors, including hemolysin, phospholipase and protease activities, and swimming motility. We hypothesize that by affecting all these virulence factors at once, 3-hydroxybutyrate (and thus also poly-β-hydroxybutyrate) can exert a significant impact on the virulence of V. campbellii. This hypothesis was confirmed in a challenge test showing that 3-hydroxybutyrate protected gnotobiotic brine shrimp from pathogenic V. campbellii, without affecting the number of host-associated vibrios.
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Affiliation(s)
- Tom Defoirdt
- Center for Microbial Ecology and Technology, Ghent University, Coupure Links 653, Ghent, Belgium.
| | - Nguyen Thi Mai Anh
- Laboratory of Aquaculture & Artemia Reference Center, Gent University, Coupure Links 653, Ghent, Belgium
- Research Institue in Aquaculture no 2, Ho Chi Minh City, Vietnam
| | - Peter De Schryver
- Laboratory of Aquaculture & Artemia Reference Center, Gent University, Coupure Links 653, Ghent, Belgium
- INVE Technologies NV, Hoogveld 93, Dendermonde, Belgium
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Franke A, Roth O, Schryver PD, Bayer T, Garcia-Gonzalez L, Künzel S, Bossier P, Miest JJ, Clemmesen C. Poly-β-hydroxybutyrate administration during early life: effects on performance, immunity and microbial community of European sea bass yolk-sac larvae. Sci Rep 2017; 7:15022. [PMID: 29118332 PMCID: PMC5678127 DOI: 10.1038/s41598-017-14785-z] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2017] [Accepted: 10/16/2017] [Indexed: 12/31/2022] Open
Abstract
The reliable production of marine fish larvae is one of the major bottlenecks in aquaculture due to high mortalities mainly caused by infectious diseases. To evaluate if the compound poly-β-hydroxybutyrate (PHB) might be a suitable immunoprophylactic measure in fish larviculture, its capacity to improve immunity and performance in European sea bass (Dicentrarchus labrax) yolk-sac larvae was explored. PHB was applied from mouth opening onwards to stimulate the developing larval immune system at the earliest possible point in time. Larval survival, growth, microbiota composition, gene expression profiles and disease resistance were assessed. PHB administration improved larval survival and, furthermore, altered the larva-associated microbiota composition. The bacterial challenge test using pathogenic Vibrio anguillarum revealed that the larval disease resistance was not influenced by PHB. The expression profiles of 26 genes involved e.g. in the immune response showed that PHB affected the expression of the antimicrobial peptides ferritin (fer) and dicentracin (dic), however, the response to PHB was inconsistent and weaker than previously demonstrated for sea bass post-larvae. Hence, the present study highlights the need for more research focusing on the immunostimulation of different early developmental stages for gaining a more comprehensive picture and advancing a sustainable production of high quality fry.
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Affiliation(s)
- Andrea Franke
- GEOMAR Helmholtz Centre for Ocean Research Kiel, Evolutionary Ecology of Marine Fishes, Kiel, Germany.
| | - Olivia Roth
- GEOMAR Helmholtz Centre for Ocean Research Kiel, Evolutionary Ecology of Marine Fishes, Kiel, Germany
| | - Peter De Schryver
- Laboratory of Aquaculture and Artemia Reference Center, Ghent University, Ghent, Belgium.,INVE Technologies N.V., Hoogveld 93, Dendermonde, Belgium
| | - Till Bayer
- GEOMAR Helmholtz Centre for Ocean Research Kiel, Evolutionary Ecology of Marine Fishes, Kiel, Germany
| | | | - Sven Künzel
- Max Planck Institute for Evolutionary Biology, Department for Evolutionary Genetics, Plön, Germany
| | - Peter Bossier
- Laboratory of Aquaculture and Artemia Reference Center, Ghent University, Ghent, Belgium
| | - Joanna J Miest
- GEOMAR Helmholtz Centre for Ocean Research Kiel, Evolutionary Ecology of Marine Fishes, Kiel, Germany.,University of Greenwich, Department of Life & Sports Sciences, Chatham Maritime, London, United Kingdom
| | - Catriona Clemmesen
- GEOMAR Helmholtz Centre for Ocean Research Kiel, Evolutionary Ecology of Marine Fishes, Kiel, Germany
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Situmorang ML, De Schryver P, Dierckens K, Bossier P. Effect of poly-β-hydroxybutyrate on growth and disease resistance of Nile tilapia Oreochromis niloticus juveniles. Vet Microbiol 2015; 182:44-9. [PMID: 26711027 DOI: 10.1016/j.vetmic.2015.10.024] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2015] [Revised: 10/20/2015] [Accepted: 10/26/2015] [Indexed: 11/18/2022]
Abstract
The growth promoting effect of the bacterial storage compound poly-β-hydroxybutyrate (PHB) has been studied for young fish of high trophic level (European sea bass) and intermediate trophic level (Siberian sturgeon). Here, the effect of PHB on growth, digestive enzyme activities, body composition and diseases resistance of juvenile Nile tilapia (Oreochromis niloticus) of low trophic level was investigated. Although dietary PHB supplementation (5, 25 and 50 g PHB kg(-1) formulated semi-purified diet) during 28 days resulted in a trend of increased weight gain, there was no significant difference in the mean final body weight (258-284 mg) when compared to the fish from the control group (on average 218 mg). Lipase activity increased significantly with about 20-40% by the supplementation of PHB in the diet, which may have led to the significant increase in total lipid content with about 10% in the PHB treatment groups. However, the profile of total (n-6) fatty acids (FAs), total monounsaturated FAs and total saturated FAs relative to the total lipid was similar among various PHB treatments. An additional challenge test on gnotobiotic Nile tilapia larvae using the pathogen Edwardsiella ictaluri gly09R showed that feeding challenged larvae with PHB-enriched Artemia nauplii resulted in a 20% higher survival as compared to the challenged control larvae. Overall, it is suggested that the trend of increased body weight gain resulted from intestinal lipid digestion, absorption and deposition and that PHB is effective as an antimicrobial agent for application in Nile tilapia larviculture.
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Affiliation(s)
- Magdalena Lenny Situmorang
- Laboratory of Aquaculture &Artemia Reference Center, Department of Animal Production, Ghent University, Rozier 44, 9000 Ghent, Belgium; School of Life Sciences and Technology, Bandung Institute of Technology, Jalan Ganesha 10, Bandung, Indonesia
| | - Peter De Schryver
- Laboratory of Aquaculture &Artemia Reference Center, Department of Animal Production, Ghent University, Rozier 44, 9000 Ghent, Belgium.
| | - Kristof Dierckens
- Laboratory of Aquaculture &Artemia Reference Center, Department of Animal Production, Ghent University, Rozier 44, 9000 Ghent, Belgium
| | - Peter Bossier
- Laboratory of Aquaculture &Artemia Reference Center, Department of Animal Production, Ghent University, Rozier 44, 9000 Ghent, Belgium
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Malik MR, Yang W, Patterson N, Tang J, Wellinghoff RL, Preuss ML, Burkitt C, Sharma N, Ji Y, Jez JM, Peoples OP, Jaworski JG, Cahoon EB, Snell KD. Production of high levels of poly-3-hydroxybutyrate in plastids of Camelina sativa seeds. PLANT BIOTECHNOLOGY JOURNAL 2015; 13:675-88. [PMID: 25418911 DOI: 10.1111/pbi.12290] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/22/2013] [Accepted: 10/07/2014] [Indexed: 05/20/2023]
Abstract
Poly-3-hydroxybutyrate (PHB) production in plastids of Camelina sativa seeds was investigated by comparing levels of polymer produced upon transformation of plants with five different binary vectors containing combinations of five seed-specific promoters for expression of transgenes. Genes encoding PHB biosynthetic enzymes were modified at the N-terminus to encode a plastid targeting signal. PHB levels of up to 15% of the mature seed weight were measured in single sacrificed T1 seeds with a genetic construct containing the oleosin and glycinin promoters. A more detailed analysis of the PHB production potential of two of the best performing binary vectors in a Camelina line bred for larger seed size yielded lines containing up to 15% polymer in mature T2 seeds. Transmission electron microscopy showed the presence of distinct granules of PHB in the seeds. PHB production had varying effects on germination, emergence and survival of seedlings. Once true leaves formed, plants grew normally and were able to set seeds. PHB synthesis lowered the total oil but not the protein content of engineered seeds. A change in the oil fatty acid profile was also observed. High molecular weight polymer was produced with weight-averaged molecular weights varying between 600 000 and 1 500 000, depending on the line. Select lines were advanced to later generations yielding a line with 13.7% PHB in T4 seeds. The levels of polymer produced in this study are the highest reported to date in a seed and are an important step forward for commercializing an oilseed-based platform for PHB production.
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Affiliation(s)
| | - Wenyu Yang
- Donald Danforth Plant Science Center, Saint Louis, MO, USA
| | | | | | | | - Mary L Preuss
- Donald Danforth Plant Science Center, Saint Louis, MO, USA
- Department of Biological Sciences, Webster University, Saint Louis, MO, USA
| | | | | | - Yuanyuan Ji
- Metabolix Oilseeds Inc, Saskatoon, SK, Canada
| | - Joseph M Jez
- Donald Danforth Plant Science Center, Saint Louis, MO, USA
- Department of Biology, Washington University, Saint Louis, MO, USA
| | | | - Jan G Jaworski
- Donald Danforth Plant Science Center, Saint Louis, MO, USA
| | - Edgar B Cahoon
- Donald Danforth Plant Science Center, Saint Louis, MO, USA
- Center for Plant Science Innovation and Department of Biochemistry, University of Nebraska, Lincoln, NE, USA
| | - Kristi D Snell
- Metabolix Oilseeds Inc, Saskatoon, SK, Canada
- Metabolix Inc, Cambridge, MA, USA
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Snell KD, Singh V, Brumbley SM. Production of novel biopolymers in plants: recent technological advances and future prospects. Curr Opin Biotechnol 2015; 32:68-75. [DOI: 10.1016/j.copbio.2014.11.005] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2014] [Accepted: 11/06/2014] [Indexed: 12/27/2022]
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Probing the protective mechanism of poly-ß-hydroxybutyrate against vibriosis by using gnotobiotic Artemia franciscana and Vibrio campbellii as host-pathogen model. Sci Rep 2015; 5:9427. [PMID: 25822312 PMCID: PMC4378509 DOI: 10.1038/srep09427] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2014] [Accepted: 02/24/2015] [Indexed: 02/07/2023] Open
Abstract
The compound poly-ß-hydroxybutyrate (PHB), a polymer of the short chain fatty acid ß-hydroxybutyrate, was shown to protect experimental animals against a variety of bacterial diseases, (including vibriosis in farmed aquatic animals), albeit through undefined mechanisms. Here we aimed at unraveling the underlying mechanism behind the protective effect of PHB against bacterial disease using gnotobiotically-cultured brine shrimp Artemia franciscana and pathogenic Vibrio campbellii as host-pathogen model. The gnotobiotic model system is crucial for such studies because it eliminates any possible microbial interference (naturally present in any type of aquatic environment) in these mechanistic studies and furthermore facilitates the interpretation of the results in terms of a cause effect relationship. We showed clear evidences indicating that PHB conferred protection to Artemia host against V. campbellii by a mechanism of inducing heat shock protein (Hsp) 70. Additionally, our results also showed that this salutary effect of PHB was associated with the generation of protective innate immune responses, especially the prophenoloxidase and transglutaminase immune systems – phenomena possibly mediated by PHB-induced Hsp70. From overall results, we conclude that PHB induces Hsp70 and this induced Hsp70 might contribute in part to the protection of Artemia against pathogenic V. campbellii.
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