Binding Affinity Prediction Using Self-supervised Learning and QP-Ensemble

Yejin Cho,Jooyong Shim,Kyungha Seok 계명대학교 자연과학연구소 2023 Quantitative Bio-Science Vol.42 No.1

Obesity Regulation through Gut Microbiota Modulation and Adipose Tissue Browning

Yejin Cho(조예진),Rahman Md. Shamim(라만 엠디 샤밈),Yong-Sik Kim(김용식) 한국생명과학회 2019 생명과학회지 Vol.29 No.8

비만은 에너지 섭취와 소비의 불균형으로 인해 유발되는 비정상적인 지방 축적으로, 근래에 다양한 만성질환을 초래하는 주요 국제 보건 문제로 부상하였다. 이러한 이유로, 비만 문제에 대한 여러 해결책들이 제시되고 있다. 에너지를 저장하며 내분비 작용을 하는 백색 지방과 달리 열을 생성하여 에너지를 발산하는 두 종류의 지방조직인 갈색 지방과 베이지색 지방이 성인에 존재하며 외부 자극에 의해 유도될 수 있다는 것이 밝혀진 이래로, 이들은 비만 치료의 유망한 표적으로서 각광받고 있다. 이러한 외부 자극 중, 인간 장관계에서 인간과 공존하는 장내 미생물총은 다양한 대사 작용에 참여하며, 이를 조절하는 것이 여러 대사 질환의 치료에 유력한 작용을 할 것으로 보인다. 따라서, 다양한 연구에서 항비만 치료가 장내 미생물 환경 전환이나 갈색 지방 조직 활성화에 미치는 영향에 초점을 맞추고 있다. 본 총설에서는 비만과 체중 증가, 대사 질환을 해소하는 것으로 알려진 자극과, 장내 미생물총의 변화나 갈색지방의 활성화를 야기하는 자극과, 이 자극들과 장내 미생물총의 조작, 지방조직의 갈색화 사이에서 알려져 있거나 있을 수 있는 상관관계를 중점적으로 다루고자 한다. Obesity, represented by abnormal fat accumulation due to an imbalance between energy intake and expenditure, is a major public health issue worldwide, leading to multiple noncommunicable diseases, including atherosclerosis, hypertension, type 2 diabetes, and cancer. Diverse solutions have been proposed to combat obesity. Attention has focused on two types of adipose tissues as a promising therapeutic target in obesity: traditional brown and beige or brite. Unlike energy-storing white adipose (endocrine) tissue, traditional brown adipose tissue and beige adipose tissue have energy-dissipating thermogenic properties. Both types of tissue are present in adult humans and inducible through external stimuli, such as cold exposure, β3-adrenergic receptor agonists, and phytochemicals. Among these stimuli, microbiota present in the human intestinal tract participate in multiple metabolic activities. Modulation of gut microbiota may offer a potent and possibly curative strategy against various metabolic diseases. Numerous studies have focused on the effects of established antiobesity treatments on the gut microenvironment or brown-adipose-tissue activation. In this review, we focus mainly on stimuli known to alleviate obesity, weight gain, and metabolic diseases, in addition to known and possible inter-relations between gut microbiota modulation and similar interventions and adipose tissue browning. The findings may pave the way toward new strategies against obesity.

Inhibitory effect of α-terpinyl acetate on cytochrome P450 2B6 enzymatic activity

Lee, Yejin,Park, Hyoung-Goo,Kim, Vitchan,Cho, Myung-A.,Kim, Harim,Ho, Thien-Hoang,Cho, Kyoung Sang,Lee, Im-Soon,Kim, Donghak Elsevier Pub. Co 2018 Chemico-biological interactions Vol.289 No.-

<P><B>Abstract</B></P> <P>Human cytochrome P450 2B6 is an important hepatic enzyme for the metabolism of xenobiotics and clinical drugs. Recently, more attention has been paid to P450 2B6 because of the increasing number of drugs it metabolizes. It has been known to interact with terpenes, the major constituents of the essential oils used for various medicinal purposes. In this study, the effect of monoterpenes on P450 2B6 catalytic activity was investigated. Recombinant P450 2B6 was expressed in <I>Escherichia coli</I> and purified using Ni-affinity chromatography. The purified P450 2B6 enzyme displayed bupropion hydroxylation activity in gas-mass spectrometry (GC-MS) analysis with a <I>k</I> <SUB>cat</SUB> of 0.5 min<SUP>−1</SUP> and a <I>K</I> <SUB>m</SUB> of 47 μM. Many terpenes displayed the type I binding spectra to purified P450 2B6 enzyme and α-terpinyl acetate showed strong binding affinity with a <I>K</I> <SUB>d</SUB> value of 5.4 μM. In GC-MS analysis, P450 2B6 converted α-terpinyl acetate to a putative oxidative product. The bupropion hydroxylation activity of P450 2B6 was inhibited by α-terpinyl acetate and its IC<SUB>50</SUB> value was 10.4 μM α-Terpinyl acetate was determined to be a competitive inhibitor of P450 2B6 with a <I>K</I> <SUB>i</SUB> value of 7.6 μM. The molecular docking model of the binding site of the P450 2B6 complex with α-terpinyl acetate was constructed. It showed the tight binding of α-terpinyl acetate in the active site of P450 2B6, which suggests that it could be a competitive substrate for P450 2B6.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Recombinant P450 2B6 was expressed and purified. </LI> <LI> Purified P450 2B6 displayed the bupropion hydroxylation activity. </LI> <LI> Terpenes displayed the typical type I binding spectra to P450 2B6. </LI> <LI> α-Terpinyl acetate showed strong binding affinity to P450 2B6. </LI> <LI> α-Terpinyl acetate is a competitive inhibitor of P450 2B6 to bupropion. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

수능인가 학생부인가? 입학전형별 대학생의 전공만족도와 고차원학습 차이

조예진(Yejin Cho),함승환(Seung-Hwan Ham) 학습자중심교과교육학회 2024 학습자중심교과교육연구 Vol.24 No.11

목적 이 연구는 수능 위주 전형과 학생부 위주 전형으로 입학한 대학생을 대상으로 하여 입학전형별 고차원학습 수준을 실증적으로 살펴보고, 이 관계에서 전공만족도의 매개효과를 검토한다. 분석 결과를 기반으로 입학전형을 교육적인 관점에서 조명하고 정책적함의를 제시하고자 한다. 방법 서울 소재 H 대학교 재학생을 대상으로 실시한 학습경험 설문조사 자료를 분석에 사용하였다. 최종적으로 915명의 자료가분석에 활용되었다. 대학생의 고차원학습 수준을 입학전형 및 전공만족도의 함수로 설명하는 회귀분석을 실시하였으며, 전공만족도의 매개효과를 추가로 검토하였다. 결과 수능 위주 전형으로 입학한 학생은 학생부 위주 전형으로 입학한 학생에 비해 고차원학습 수준이 더 낮은 경향성을 보였다. 추가분석 결과, 학생부 위주 전형으로 입학한 학생에 비해 수능 위주 전형으로 입학한 학생의 고차원학습 수준이 더 낮은 것은 비교적 낮은 전공만족도에서 기인할 가능성이 관찰되었다. 매개효과 검증 결과, 실제로 전공만족도의 매개효과가 통계적으로 유의하였다. 결론 수능 위주 전형과 학생부 위주 전형으로 입학한 대학생 간에는 고차원학습 수준에 차이가 있으며, 그 차이는 전공만족도의 차이와 밀접하게 관련된 것으로 보인다. 이러한 결과를 바탕으로 대입제도에 대한 논의를 교육학적 관점에서 더욱 정교화할 필요성을 제기한다. Objectives This study empirically examines the level of higher-order learning among college students admitted through two distinct admission types: College Scholastic Aptitude Test (CSAT)-based and School Record-based admissions. It also investigates the mediating effect of major satisfaction in this relationship. This study aims to discuss educational implications of admission types and provide policy suggestions. Methods Data from a survey conducted on students at H University in Seoul were analyzed. A total of 915 responses were analyzed. Regression analysis was conducted to explain the relationship between admission types and the level of higher-order learning. Additionally, the mediating effect of major satisfaction was examined. Results Students admitted through CSAT-based admissions showed a tendency towards lower level of higher-order learning compared to those admitted through School Record-based admissions. Further analysis revealed that the lower level of higher-order learning among students admitted through CSAT-based admissions may be attributed to lower major satisfaction. The mediating effect of major satisfaction was statistically significant. Conclusions Difference in the level of higher-order learning exists between college students admitted through CSAT-based and School Record-based admissions. This difference appears to be closely related to their major satisfaction. These findings suggest a need to refine discussions on admission systems from an educational perspective.

부정적 양육과 사회적 위축이 청소년 비행피해에 미치는 종단적 영향

조예진(Cho, Yejin),주해원(Ju, Haewon),현명호(Hyun, Myoungho) 한국청소년정책연구원 2015 한국청소년연구 Vol.26 No.2

본 연구는 다변량 잠재성장모형(Multivariate Latent Growth Model)에 근거하여, 부정적 양육경험, 사회적 위축, 비행피해 경험 간의 관련성을 살펴보았다. 이를 위해 2010년부터 2016년까지로 계획된 한국 아동, 청소년 패널 조사(KCYPS)의 중1 패널을 활용하였으며, 중2-고1 시점 자료(총 2311명)를 사용하였다. 그 결과 부정적 양육경험과 비행피해는 시간에 따라 감소하는 양상을 보였으며, 두 변수 모두 초기치가 높을수록 시간에 따른 감소 폭이 더 큰 것으로 나타났다. 또한 부정적 양육 경험, 사회적 위축, 비행피해 경험 모두 시간에 따른 발달궤적에 있어 유의한 개인차를 나타내었다. 사회적 위축 초기치는 부정적 양육경험 초기치와 비행피해 초기치 간의 관계를 부분 매개하여 변수들 간 횡단적 관계를 보여주었다. 즉, 부정적 양육을 많이 경험한 청소년일수록 동 시점에 사회적으로 더 위축되는 경향을 보이고, 이는 비행피해에 노출될 확률을 높임을 의미한다. 또한 사회적 위축 초기치는 부정적 양육경험 초기치와 비행피해 변화율 간의 관계도 부분 매개하는 것으로 나타나, 변수들 간 종단적 관계를 보여주었다. 이는 사회적 위축을 매개로 하여 비행 피해에 미치는 부정적 양육의 영향력이 시간의 흐름에 따라 점차 감소함을 의미한다. 위 결과들을 바탕으로 본 연구의 의의와 한계를 논의하였다. The present study investigated the relationships which exist between negative parenting attitudes (maltreatment/neglect), social withdrawal, and victimization in adolescence using the Multivariate Latent Growth Model. The participant sample was taken from the Korean Child and Youth Panel Survey(KCYPS), and the data of 2,311 adolescents in the period between 8th and 10th grade were analyzed. As a result, the trajectories of negative parenting attitudes and victimization have shown to follow a decrease over time. Additionally, all three variables represented significant individual differences in terms of initial value and rates of change. Furthermore, the initial value of social withdrawal was shown to partially mediate the initial effects of negative parenting attitudes on victimization. Moreover, the initial value of social withdrawal partially mediated the effects of negative parenting attitudes on the rate of change in victimization.

Susceptibility of field populations of Plutella xylostella and Spodoptera exigua to four diamide insecticides

Sun-Ran Cho,Yejin Kyung,Soeun Shin,Won-Jin Kang,Dae Hoon Jeong,Seung-Ju Lee,Geun-Ho Park,Sung Il Kim,Sung Woo Cho,Hyun Kyung Kim,Hyun-Na Koo,Gil-Hah Kim 한국응용곤충학회 2018 한국응용곤충학회 학술대회논문집 Vol.2018 No.04

The present study evaluated the susceptibility of field populations of Plutella xylostella and Spodoptera exigua larvae to four diamide insecticides—chlorantraniliprole, cyantraniliprole, cyclaniliprole, and flubendiamide. All the four diamide insecticides induced 100% mortality in the populations from Seongju (SJ) and Geochang (GC) when treated at a concentration recommended for P. xylostella. However, a very low insecticidal activity was observed in the population from Pyeongchang (PC) with 42.3% 3 d after treatment with chlorantraniliprole. Further, the populations of S. exigua from Cheongju (CJ), Jindo (JD), and Yeonggwang (YG) were not completely controlled by the 4 diamide insecticides. A comparison of susceptibility of S. exigua larvae to chlorantraniliprole between 2014 and 2017 showed that chlorantraniliprole induced 100% mortality in all populations in 2014, whereas a very low insecticidal activity was observed among the populations in 2017. This study can serve as a basis to control pests effectively using diamide insecticides.

Fumigation activity and phytotoxicity of phosphine to control Pseudococcus longispinus (Hemiptera: Pseudococcidae) and P. orchidicola on imported nursery plants

Sung Woo Cho,YeJin Kyung,Geun-Ho Park,Sun-Ran Cho,Byung-Ho Lee,Jeong-Oh Yang,Hyun-Na Koo,Hyun Kyung Kim,Gil-Hah Kim 한국응용곤충학회 2018 한국응용곤충학회 학술대회논문집 Vol.2018 No.10

This study investigated the fumigant activity of phosphine (PH3) on 2 kinds of mealybug (Pseudococcus longispinus and P. orchidicola (Hemiptera: Pseudococcidae)) adults and nymphs. All of the two mealybugs adults showed higher LCT99 values than nymphs, and P. longispinus showed higher tolerance than P. orchidicola in a 12 L desiccator. The absorption of phosphine on 13 nursery plants showed 12.2~41.5% difference depending on the plant. All of the mealybugs treated with phosphine 2 mg/L in 0.5 m3 fumigation chamber for 4 h showed 100% fumigant activity, except P. longispinus adult (approximately 90% at bottom part). However, when the exposure time was increased to 24 h, all of them showed 100% mortality. In the treatment of 10 m3 container, the 24 h treatment of phosphine showed 100% mortality to P. longispinus and P. orchidicola adults and nymphs. In all the experiments, no phytotoxicity of phosphine observed on 13 plants until 1 month after treatment.

Fumigation activity and phytotoxicity of combination of phosphine and ethyl formate to Pseudococcus longispinus (Hemiptera: Pseudococcidae) and P. orchidicola on imported nursery plants

Sung Woo Cho,YeJin Kyung,Geun-Ho Park,Sun-Ran Cho,Byung-Ho Lee,Jeong-Oh Yang,Hyun Kyung Kim,Gil-Hah Kim 한국응용곤충학회 2018 한국응용곤충학회 학술대회논문집 Vol.2018 No.10

A combination using phosphine (PH3) and ethyl formate (EF) was performed to compensate for the disadventages (long exposure time and phytotoxicity) of a single substance. P. longisipinus was more susceptible to mixed phosphine and ethyl formate than P. orchidicola in 12 L dessicator. Mortality of mixed treatment was higher than aggregated mortalities that treated individually, so it indicated to have a synergic effect on each other. Ethyl formate was showed higher adsorption rate than phosphine on imported nursery plants and showed differences depending on the plant. P. longispinus and P. orchidicola was showed 100% mortality when phosphine and ethyl formate was treated as 1 g/m3 and 30 g/m3 for 4 hour in 0.5 m3 fumigation chamber and in 10 m3 container. Phytotoxicity was evaluated to mixture of phosphine and ethyl formate at 1 month after treatment.

Fumigation activity and phytotoxicity of combination of phosphine and ethyl formate to Pseudococcus longispinus (Hemiptera: Pseudococcidae) and P. orchidicola on imported nursery plants

Sung Woo Cho,YeJin Kyung,Geun-Ho Park,Sun-Ran Cho,Byung-Ho Lee,Jeong-Oh Yang,Hyun Kyung Kim,Gil-Hah Kim 한국농약과학회 2018 한국농약과학회 학술발표대회 논문집 Vol.2018 No.10

Fumigation activity and phytotoxicity of phosphine to control Pseudococcus longispinus (Hemiptera: Pseudococcidae) and P. orchidicola on imported nursery plants

Sung Woo Cho,YeJin Kyung,Geun-Ho Park,Sun-Ran Cho,Byung-Ho Lee,Jeong-Oh Yang,Hyun-Na Koo,Hyun Kyung Kim,Gil-Hah Kim 한국농약과학회 2018 한국농약과학회 학술발표대회 논문집 Vol.2018 No.10