http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Review : Regulation of a Novel Guanine Nucleotide Binding Protein Tissue Transglutaminase ( Gαn )
(Mie Jae Im) 생화학분자생물학회 2001 BMB Reports Vol.34 No.2
Tissue transglutaminase (TGII, Gαh) belongs to a family of enzymes which catalyze post-translational modification of proteins by forming isopeptides via Ca^(2+)-dependent reaction. Although TGII-mediated formation of isopeptides has been implicated to play a role in a variety of cellular processes, the physiological function of TGII remains unclear. In addition to this Tease activity, TGII is a guanosine triphosphatase (GTPase) which binds and hydrolyzes GTP It is now well recognized that the GTPase action of TGII regulates a receptor-mediated transmembrane signaling, functioning as a signal transducer of the receptor. This TGII function signifies that TGII is a new class of GTP-binding regulatory protein (G-protein) that differs from $quot;Classical$quot; heterotrimeric G-proteins. Regulation of enzyme is an important biological process for maintaining cell integrity This review summarizes the recent development in regulation of TGII that may help for the better understanding of this unique enzyme. Since activation and inactivation of GTPase of TGII are similar to the heterotrimeric G-proteins, the regulation of heterotrimeric G-protein in the transmembrane signaling is also discussed.
Regulation of a Novel Guanine Nucleotide Binding Protein Tissue Transglutaminase ($G{\alpha}_n$).
Im, Mie-Jae Korean Society for Biochemistry and Molecular Biol 2001 Journal of biochemistry and molecular biology Vol.34 No.2
Tissue transglutaminase (TGII, $G{\alpha}h$) belongs to a family of enzymes which catalyze post-translational modification of proteins by forming isopeptides via $Ca^{2+}$-dependent reaction. Although TGII-mediated formation of isopeptides has been implicated to play a role in a variety of cellular processes, the physiological function of TGII remains unclear. In addition to this Tease activity, TGII is a guanosine triphosphatase (GTPase) which binds and hydrolyzes GTP It is now well recognized that the GTPase action of TGII regulates a receptor-mediated transmembrane signaling, functioning as a signal transducer of the receptor. This TGII function signifies that TGII is a new class of GTP-binding regulatory protein (G-protein) that differs from "Classical" heterotrimeric G-proteins. Regulation of enzyme is an important biological process for maintaining cell integrity. This review summarizes the recent development in regulation of TGII that may help for the better understanding of this unique enzyme. Since activation and inactivation of GTPase of TGII are similar to the heterotrimeric G-proteins, the regulation of heterotrimeric G-protein in the transmembrane signaling is also discussed.
Anisylidenenitromethane의 친핵성 가수분해 반응의 반응기구
박옥현,임미재 梨花女子大學校 韓國生活科學硏究院 1973 韓國生活科學硏究院 論叢 Vol.11 No.-
Anisylidenenitromethane (ANM)의 친핵성 가수분해 반응의 반응속도 상수를 여러 pH에서 구하였고 이 반응메카니즘에 잘 적용되는 전체 반응속도식을 구하였다. 이 반응속도식에서 산성쪽 반응메카니즘과 염기성쪽 반응메카니즘이 서로 다르다는 것을 알았다. 즉 산성쪽의 가수분해반응은 ANM에 물분자가 먼저 첨가됨으로서 반응이 시작되나 염기성쪽에서는 hydroxide ion의 첨가에 의하여 반응이 시작된다. 그러나 Mechael 반응에 따르지 않고 복잡하다. 왜냐하면 ANM이 강염기용매에서는 약산으로 작용하여 해리가 이루어지기 때문이다. 따라서 acid dissociation constant (K_a)로 고려해야 하므로 pH 11 이상에서는 rate contant가 일정함을 볼 수 있다. The rate-constants of the nucleophilic hydrolysis of anisylidenenitromethane (ANM) were determined at various pH and a rate-equation that could be well applied to the all range of pH were also obtained. This rate-equation shows that the mechanism of the reaction in acidic media is different from that in basic media: The reaction of hydrolysis in acid media is started by addition of water molecule, but that in basic media is started by addition of hydroxyl ion. However it is not involved in Michael reaction, because ANM in strong basic media behaves as weak acid and acid dissociation costant (Ka) of ANM should be considered at the rate-equation. Here the rate constants keep the same when above pH 11 it is.
Acid and Alkaline Phosphatases of the Pine Moth, Dendrolimus Spectabilis Butler
( Chong Myung Yoo ),( Mie Jae Im ) 숭실대학교 인문과학연구소 1972 인문학연구 Vol.3 No.-
松虫의 acid 및 alkaline Phosphatase의 活性度를 발생 단계인 幼虫에서 부터 成虫에 이르기 까지 測定하였다. 兩酵素의 活性度는 幼虫의 成長과 더 불어 점점 增加하고 前蛹期에 감소하였다. Acid phosphatase는 蛹期初에 그리고 Alkaline phosphatase는 幼虫齡에서 各各 最高의 값을 나타내었다. 그리고 前蛹期에서 兩酵素間의 差異는 별로 없으나 幼虫齡에 있어서 보다는 훨씬 높았다. 蛹期初에 兩酵素의 活性度는 증가하고 後期에 감소, 成虫時期에 다시 上昇하였다. The activity of acid and alkaline phosphatases of pine moth, Dendrolimlls spectabilis Butler was measured in a series of developmental stages ranging from the larva to the adult. The activity of both the enzymes increased gradually with age of larvae, and in the prepllpal stage, it decreased. Acid enzyme was at a maximum in the pupal early stage and alkaline enzyme in the 8th instar larva, respectively. And in the prepupal stage there were no significant differences between both acid alkaline phophatases. However, their activities were far lower than in the 8th instar larva. In the pupal early stage there occurs a increase in the activity of both enzymes followed by a decrease in the pupal later stage, and in the adult stage their activities increased again.
Physicochemical Properties of Heme Iron Products in the Korean Market
Uh-Hyun Kim,Young-Mi Shin,Mie-Jae Im,Seon-Yong Kim 한국식품영양과학회 2006 Journal of medicinal food Vol.9 No.2
Since absorption efficacy of heme iron (HI) is critically dependent on its solubility in aqueous solution, we in-vestigated the physicochemical properties of two HI products available in the Korean market. The two HI products did notdiffer in ingredients and color. However, HI polypeptide (HIP), produced in Korea, was fairly soluble over a wide pH rangein water-based solutions, whereas HI imported from Japan was insoluble except in strong acid and base solutions. Analysisusing an ultraviolet-visible spectrophotometer showed that the chromophore of HIP was shifted to the red compared with thatof HI. Fourier transform-infrared analysis revealed that HIP contained mainly amide (NH) groups, while HI largely containedamine (NH2) groups. With regard to constituents, between HIP and HI, their major components were different from each otheraccording to their ratio of fronts obtained by thin-layer chromatography. These results suggest that determination of solubil-ity should be included in the quality control process of HI products.
ω-nitro-2-vinylthiophene의 친핵성 가수분해 반응메카니즘의 반응속도론적 연구
朴玉鉉,吳容玉,任美宰 梨花女子大學校 韓國生活科學硏究院 1974 韓國生活科學硏究院 論叢 Vol.13 No.-
The rats constants of the nucleophilic hudrolysis of ω-nitro-2-vinyl thiophene (NVT) were determined at vrious pH and the rate equations were obtained that can be applied to the whole range of pH. From these rate equations, the mechanisms of the reaction are different in acidic and basic media. The reaction of hydrolysis in acid media is started by the addition of the hydroxide ion.