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Roles of lignin biosynthesis and regulatory genes in plant development
Yoon, Jinmi,Choi, Heebak,An, Gynheung John Wiley and Sons Inc. 2015 Journal of integrative plant biology Vol.57 No.11
<P><B>Abstract</B></P><P>Lignin is an important factor affecting agricultural traits, biofuel production, and the pulping industry. Most lignin biosynthesis genes and their regulatory genes are expressed mainly in the vascular bundles of stems and leaves, preferentially in tissues undergoing lignification. Other genes are poorly expressed during normal stages of development, but are strongly induced by abiotic or biotic stresses. Some are expressed in non‐lignifying tissues such as the shoot apical meristem. Alterations in lignin levels affect plant development. Suppression of lignin biosynthesis genes causes abnormal phenotypes such as collapsed xylem, bending stems, and growth retardation. The loss of expression by genes that function early in the lignin biosynthesis pathway results in more severe developmental phenotypes when compared with plants that have mutations in later genes. Defective lignin deposition is also associated with phenotypes of seed shattering or brittle culm. MYB and NAC transcriptional factors function as switches, and some homeobox proteins negatively control lignin biosynthesis genes. Ectopic deposition caused by overexpression of lignin biosynthesis genes or master switch genes induces curly leaf formation and dwarfism.</P>
Determination of HIF-1α degradation pathways via modulation of the propionyl mark
Kwanyoung Jeong,Jinmi Choi,Ahrum Choi,Joohee Shim,Young Ah Kim,Chang-Seok Oh,Hong-Duk Youn,Eun-Jung Cho 생화학분자생물학회 2023 BMB Reports Vol.56 No.4
The hypoxia-inducible factor-1α (HIF-1α) is a key regulator ofhypoxic stress under physiological and pathological conditions. HIF-1α protein stability is tightly regulated by the ubiquitin-proteasomesystem (UPS) and autophagy in normoxia, hypoxia,and the tumor environment to mediate the hypoxic response. However, the mechanisms of how the UPS and autophagy interplayfor HIF-1α proteostasis remain unclear. Here, we founda HIF-1α species propionylated at lysine (K) 709 by p300/CREBbinding protein (CBP). HIF-1α stability and the choice of degradationpathway were affected by HIF-1α propionylation. K709-propionylation prevented HIF-1α from degradation throughthe UPS, while activated chaperon-mediated autophagy (CMA)induced the degradation of propionylated and nonpropionylatedHIF-1α. CMA contributed to HIF-1α degradation in both normoxiaand hypoxia. Furthermore, the pan-cancer analysis showedthat CMA had a significant positive correlation with the hypoxicsignatures, whereas SIRT1, responsible for K709-depropionylationcorrelated negatively with them. Altogether, our results revealeda novel mechanism of HIF-1α distribution into two differentdegradation pathways.
Histone acylation marks respond to metabolic perturbations and enable cellular adaptation
조찬희,박석재,Oh Sungjoon,Choi Jinmi,김은경,윤홍덕,조은정 생화학분자생물학회 2020 Experimental and molecular medicine Vol.52 No.-
Acetylation is the most studied histone acyl modification and has been recognized as a fundamental player in metabolic gene regulation, whereas other short-chain acyl modifications have only been recently identified, and little is known about their dynamics or molecular functions at the intersection of metabolism and epigenetic gene regulation. In this study, we aimed to understand the link between nonacetyl histone acyl modification, metabolic transcriptional regulation, and cellular adaptation. Using antibodies specific for butyrylated, propionylated, and crotonylated H3K23, we analyzed dynamic changes of H3K23 acylation upon various metabolic challenges. Here, we show that H3K23 modifications were highly responsive and reversibly regulated by nutrient availability. These modifications were commonly downregulated by the depletion of glucose and recovered based on glucose or fatty acid availability. Depletion of metabolic enzymes, namely, ATP citrate lyase, carnitine acetyltransferase, and acetyl-CoA synthetase, which are involved in Ac-CoA synthesis, resulted in global loss of H3K23 butyrylation, crotonylation, propionylation, and acetylation, with a profound impact on gene expression and cellular metabolic states. Our data indicate that Ac-CoA/CoA and central metabolic inputs are important for the maintenance of histone acylation. Additionally, genome-wide analysis revealed that acyl modifications are associated with gene activation. Our study shows that histone acylation acts as an immediate and reversible metabolic sensor enabling cellular adaptation to metabolic stress by reprogramming gene expression.
Jinhuan Wei,Yunfei Wu,Lae-Hyeon Cho,Jinmi Yoon,Heebak Choi,Hyeryung Yoon,Ping Jin,Jakyung Yi,Yang-Seok Lee,Hee Joong Jeong,Jungil Yang,Gynheung An 한국식물학회 2017 Journal of Plant Biology Vol.60 No.3
T-DNA tagging lines are useful for analyzing the functions of genes and regulatory elements. We have previously generated approximately 100,000 insertional mutants in japonica rice (Oryza sativa), using T-DNA vectors carrying the promoter-less GUS reporter gene. In this study, we conducted GUS assays of seedlings from 430 lines in which TDNA was inserted into transcription factor genes. Among the 75 lines that showed GUS signals, nine displayed an endospermpreferential expression pattern; two lines demonstrated GUS signals in both endosperm and roots; 21 lines had GUS expression mainly in leaves; 19 lines showed GUS signal in both leaves and roots; and 24 lines expressed GUS predominantly in the roots. Co-segregation analyses of 49 homozygous lines indicated that the GUS expression patterns observed from 38 lines were due to the T-DNA insertion. We also identified fusion transcripts between tagged genes and the GUS reporter in six lines. Quantitative RT-PCR confirmed that the GUS expression patterns of those tagged lines indeed represent organ- and tissue-preferential expression of the tagged genes. The GUS-tagged transcription factor lines identified here will be useful for functional analysis of these candidates.
이경득(Kyoung-Deug Lee),한재용(Jae-Yong Han),정진미(Jinmi Jeung),이순흠(Sunheum Lee),한상민(Sang-Min Han),최관순(Kwan-Sun Choi) 한국정보기술학회 2011 Proceedings of KIIT Conference Vol.2011 No.5
현재 생산되고 있는 디지털 혼은 기구물의 편차를 보정하기 위한 전문 작업 인력이 필요하고 작업 시간이 오래 걸리는 문제점이 있다. 이에 본 논문에서는 기구물의 편차를 쉽게 보정할 수 있는 디지털 혼을 구현하였다. 이를 통해 작업 시간과 작업 인력을 감소시켜 생산성이 증가하는 효과를 얻을 수 있다. The experts is needed to compensate for the gap between the manufactured horns and the expected horns in the process of production currently being used and therefore working time is easily affected and prolonged by the degree of experts’ skill. In this paper, the digital horn has been implemented, which can be easily compensated for the gap. The implemented horn reduces working time and work force and the productivity has been considerably enhanced.
Nano-SiO<sub>2</sub> 복합에 의한 바이오매스 기반 폴리우레탄 무공형 멤브레인 필름의 투습성 향상에 관한 연구
강승구,최현진,김진미,이승재,박종성,권오경,민병길,Kang, Seung-Gu,Choi, Hyeon-jin,Kim, Jinmi,Lee, Seungjae,Park, Jong Sung,Kwon, Oh Kyung,Min, Byung Gil 한국섬유공학회 2015 한국섬유공학회지 Vol.52 No.2
The aim of this work was to enhance water vapor permeability of bio-polyurethane thin films, which is essential in non-microporous-type films for applications in breathable fabrics, by hybridizing with silica particles. As the bio-polyurethane, which was synthesized using biomass-based $Susterra^{(R)}$ 1,3-propanediol, did not have enough hydrophilicity for a breathable film, the hybridizing effect of hydrophilic nano- or micro-sized silica ($SiO_2$) on the breathability of bio-polyurethane thin films was investigated by measuring the water contact angle and water vapor permeability of the films. It was found that the permeability of the bio-polyurethane film could be significantly enhanced by hybridizing with $nano-SiO_2$ as well as $micro-SiO_2$. It was also observed that the $nano-SiO_2$ was more effective than the $micro-SiO_2$ in improving permeability. It was found that permeability in bio-polyurethane film could be improved up to more than 100% with $nano-SiO_2$ content at 9 wt%.
혼합용매에 의한 단순화 반응 기반 다중 관능기 도입 킬레이트 수지의 합성 및 보론 흡착특성 향상
방영길(Young-Kill Bang),박창현(Changhyun Park),한정현(Junghyun Han),이태진(Taejin Lee),최영주(Youngju Choi),정진미(Jinmi Jung),김형일(Hyung-Il Kim) 한국고분자학회 2020 폴리머 Vol.44 No.3
수처리 시스템에 적용하기 위한 보론 흡착용 기본 수지로 poly(St-co-DVB) 가교중합체를 현탁중합으로 합성하였다. 기본 수지에 대하여 염화메틸화 반응을 거쳐 글루카민기가 도입된 킬레이트 수지를 평균 입경 500 μm 구형의 고다공성 수지로 합성하였다. 이러한 반응과정에서 혼합용매와 상용화 용매를 사용하여 상분리 없이 반응단계를 간소화하여 킬레이트 수지를 합성하였다. 글루카민기의 입체장애에 따라 글루카민 치환반응이 원활히 진행되지 못하는 문제점을 하이드록시기를 갖는 저분자량 아미노알코올을 사용하여 해결함으로써 보론 이온 흡착률이 30% 이상 향상된 새로운 구조의 킬레이트 수지를 합성하였다. 이러한 킬레이트 수지에 대해서 가교제 함량, 글루카민기 및 아미노알코올기 도입이 보론 흡착특성에 미치는 영향을 조사하였다. Poly(St-co-DVB) crosslinked polymer was synthesized by suspension polymerization as a base material for boron adsorption in order to apply to the water treatment system. Poly(St-co-DVB) crosslinked polymer was subjected to chloromethylation reaction to synthesize various chelate resins having glucamine groups, as porous spherical particles of an average size of 500 μm. The chelate resins were synthesized by the simplified reaction of chloromethylation and glucamine substitution without phase separation by applying mixed solvent and compatibilizing solvent. Chelate resins with the new structure were synthesized using low molecular weight amino alcohol containing a hydroxyl group in order to solve the steric hindrance problem among glucamine groups in the substitution reaction. As a result, the new structure of chelate resin enabled the adsorption of boron ion to be improved more than 30% higher. Boron removal characteristics of chelate resins were evaluated depending on crosslinking agent content and introduction of both glucamine and aminoalcohol groups.