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Plant made pharmaceuticals (PMP) as a convenient, safe and economical alternative to the shortfall
Wahyu Indra Fanata,In Jung Jung,Bo Hwa Son,Jae Yong Yoo,Je Hein Kim,Rikno Harmoko,Ki Seong Ko,Sang Yeol Lee,Kyun Oh Lee 한국당과학회 2010 한국당과학회 학술대회 Vol.2010 No.1
Since the completion of the human genome project, development of new therapeutic and diagnostic proteins have been exponentially increased, but widespread use of these molecules has been hampered by production bottlenecks such as low yields, poor and inconsistent product quality and a shortage of production capacity. Especially, we are facing a growing demand for protein diagnostics and therapeutics, but lack the capacity to meet those demands using established facilities. Over the last decade, plants have emerged as a convenient, safe and economical alternative to mainstream expression systems which are based on the large-scale culture of microbes or animal cells, or transgenic animals. The production of plant-made pharmaceuticals and technical proteins is known as Molecular Farming. The objective is to harness the power of agriculture to cultivate and harvest plants or plant cells producing recombinant therapeutics, diagnostics, industrial enzymes and green chemicals. Molecular Farming has the potential to provide virtually unlimited quantities of recombinant antibodies, vaccines, blood substitutes, growth factors, cytokines and enzymes for use as diagnostic and therapeutic tools in health care, the life sciences and the chemical industry. The overall aim of our research is to develop new plant molecular farming systems which are economic, efficient, stable and safe. To accomplish the purpose, we are performing specific research objectives in regards to plant molecular farming.
N-glycan maturation and plant development
Wahyu Indra Fanata,Kyoung Hwan Lee,Bo Hwa Son,Jae Yong Yoo,Rikno Harmoko,Ki Seong Ko,Nirmal Kumar Ramasamy,Kyung Hwa Kim,Hyun Suk Jung,Jae-Yean Kim,Sang Yeol Lee,Kyun Oh Lee 한국당과학회 2012 한국당과학회 학술대회 Vol.2012 No.1
Plant produce complex N-glycans with ß1,2-xylose and core α1,3-fucose residues linked to the conserved core oligosaccharide. Production of heterologous glycoprotein in plants for therapeutic purposes is limited by the presence of plant specific oligosaccharide residues that are considered to arouse immunogenic response in the recipient body. Therefore, efforts for developing humanized N-glycosylation system in plants are required for the large scale production of safe therapeutic glycoproteins. In this regard, we isolated a rice mutant lacking complex N-glycans. However, the mutant showed severe developmental defects such as retarded shoot and root development, failure in tiller formation, and finally resulted in early developmental lethality. It is also shown that the mutant contains low amount of cellulose and high content of lignin. Interestingly, callus induced from the mutant seeds was maintainable and proliferate similarly compared with that of WT despite the size were relatively smaller.
N-Acetylglucosaminyltransferase I (GnTI) is Developmentally essential in Rice (Oryza sativa)
Wahyu Indra Fanata,Jeong Chan Moon,Joo Mi Jeon,Bo Hwa Son,In Jung Jung,Jae Yong Yoo,Jae Ho Cha,Je Hein Kim,Rikno Harmoko,Ki Seong Ko,Sang Yeol Lee,Kyun Oh Lee 한국당과학회 2009 한국당과학회 학술대회 Vol.2009 No.1
N-acetylglucosaminyltransferase I (GnTI) is an enzyme that controls the formation of hybrid and complex type N-glycans. Plant produce complex N-glycans with β1,2-xylose and core α1,3-fucose residues linked to the conserved core oligosaccharide. Production of heterologous glycoprotein in plant for therapeutic purposes is limited by the presence of plant specific oligosaccharide residues that are considered to arouse immunogenic response in the recipient body. Therefore, efforts for developing humanized N-glycosylation system in plants are required for the large scale production of safe therapeutic glycoproteins. In this regard, we isolated a rice mutant lacking GnTI activity. Biochemical analyses showed that rice gnt1 mutant predominantly produced high mannose type glycans and β1,2-xylose and core α1,3-fucose were absent on the endogenous glycoproteins. However, the rice gnt1 mutant showed severe developmental defects such as retarded shoot and root development, failure in tiller formation, and finally resulted in early developmental lethality. Interestingly, callus induced from gnt1 seeds was maintainable and proliferation rate of gnt1 callus was similar with that of WT. However, gnt1 calli were relatively smaller than that of WT. [Supported by EB-NCRC & BK21 program]
Isolation and characterization of AtXBP1, a functional homolog of XBP1/Hac1, in Arabidopsis
Wahyu Indra Fanata,Jeong Chan Moon,Joo Mi Jeon,Bo Hwa Son,In Jung Jung,Jae Yong Yoo,Jae Ho Cha,Je Hein Kim,Rikno Harmoko,Ki Seong Ko,Sang Yeol Lee,Kyun Oh Lee 한국당과학회 2009 한국당과학회 학술대회 Vol.2009 No.1
A number of environmental and physiological stimuli, such as perturbation in calcium homeostasis, shift of endoplasmic reticulum (ER) redox potential, altered glycosylation and elevated protein synthesis lead to accumulation of unfolded or misfolded proteins in the ER lumen, and subsequently impose stress to ER. Such condition activates a set of signaling pathway termed the unfolded protein response (UPR). To date, a large number of components for UPR signaling pathway has been isolated and characterized in yeast or mammals. Plants also show a quite similar response compared to the UPR in yeast and mammals when they are exposure to the stimuli. However, the plant UPR and its signaling pathway are rarely studied. In this report, we present our research regarding to the characterization of a UPR signaling component AtXBP1 in Arabidopsis. AtXBP1 is alternatively spliced generating two isoforms; long isoform (AtXBP1L) and short isoform (AtXBP1S). Overexpression of AtXBP1S has shown to up regulate the expression of ER stress responsive genes. Futhermore, expression of the luciferase gene, driven by BiP3 promoter, under the ER stress condition has been significantly decreased in the atxbp1 mutant. Electrophoretic mobility shift assay revealed that only AtXBP1S is able to interact with putative XBP1 binding cis-elements in AtBiP2 and AtBiP3 promoters. These results support our hypothesis that the AtXBP1 is an important regulatory component in the UPR signaling in Arabidopsis. [Supported by BK21 program]
RNA-dependent RNA polymerase 6 is required for efficient hpRNA-induced gene silencing in plants
Harmoko, Rikno,Fanata, Wahyu Indra Duwi,Yoo, Jae Yong,Ko, Ki Seong,Rim, Yeong Gil,Uddin, Mohammad Nazim,Siswoyo, Tri Agus,Lee, Seung Sik,Kim, Dool Yi,Lee, Sang Yeol,Lee, Kyun Oh Springer-Verlag 2013 Molecules and cells Vol.35 No.3
Functional characterization of endoplasmic reticulum stress sensors in Arabidopsis thaliana
Jae Yong Yoo,Wahyu Indra Fanata,Rikno Harmoko,Ki Seong Ko,Nirmal Kumar Ramasamy,Kyung Hwa Kim,Thiyagarajan Thulasinathan,Ryun Gyeong Kim,Sang Yeol Lee,Kyun Oh Lee 한국당과학회 2013 한국당과학회 학술대회 Vol.2013 No.1
Environmental or physiological influences that induce accumulation of unfolded proteins in the lumen of endoplasmic reticulum (ER) cause ER stress and activate signaling pathway called unfolded protein response (UPR). An ER-located transmembrane receptor protein kinase/ribonuclease called Ire1 plays an essential role in the UPR in yeasts and mammals. However, it has been unclear whether a similar mechanism is applicable to Arabidopsis. To elucidate the role of Arabidopsis IRE1, we performed functional analyses by isolating loss-of-function mutants of IRE1A and IRE1B. We found that a double mutant of Arabidopsis IRE1A and IRE1B (ire1a ire1b) is more sensitive to the ER stress inducer tunicamycin than the wild-type. ire1a ire1b result in a delayed induction of BiP3 that is well known ER chaperone by tunicamycin treatment, whereas induction of several other ER chaperones in ire1a ire1b was similar with that of WT. Our results indicate that IRE1A and IRE1B are implicated in unfolded protein response signaling in plants.
Loss of ALG3 function (alg3) Leads to Enhanced ER Quality Control (ERQC) in Arabidopsis thaliana
Bo Hwa Son,Wahyu Indra Fanata,Jae Yong Yoo,Rikno Harmoko,Ki Seong Ko,Nirmal Kumar Ramasamy,Kyung Hwa Kim,Thiyagarajan Thulasinathan,Sang Yeol Lee,Kyun Oh Lee 한국당과학회 2012 한국당과학회 학술대회 Vol.2012 No.1
In plants, glycoproteins have been implicated in a wide variety of cellular processes including production of cell walls, pollination, pathogen defence and cell-to-cell communication. In addition, they have attracted considerable interest from the medical field as the main cause of food and pollen allergies. N-glycosylation is a complex process that encompasses the biosynthesis and modification of sugar moieties in the endoplasmic reticulum (ER) and Golgi. The core oligosaccharide Glc3Man9GlcNAc2 is assembled by a series of membrane-bound glycosyltransferases as the lipid carrier dolichylpyrophosphate-linked glycan in the endoplasmic reticulum (ER). The first step of this assembly pathway on the ER luminal side is mediated by ALG3 (asparagine-linked glycosylation 3), which is a highly conserved reaction among eukaryotic cells. In Arabidopsis ALG3 mutant (alg3), an immature lipid-linked oligosaccharide structure, M5ER, was synthesized and efficiently processed into complex-type glycans. Although no high-mannose-type glycoproteins are detected in alg3 plants, these plants do not show a growth phenotype under normal growth conditions. However, the glycosylation abnormalities result in activation of marker genes diagnostic of the unfolded protein response and alg3 mutant showed a stress sensitive phenotype. These results indicate that ALG3 is a critical factor for correct N-glycosylation of proteins and is involved in the ER stress response.