• 한국식품영양과학회:학술대회논문집
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• 한국식품영양과학회 2001년도 International Symposium on Food,Nutrition and Health for 21st Century
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• pp.69-73
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• 2001

Two opioid peptides, YPLDL and YPLDLF, were isolated from enzymatic digests of spinach ribulose-1, 5-bisphosphate carboxylase/oxygenase (RuBisCO) and named rubiscolin-5 and -6, respectively. These peptides were selective for delta-receptor and the latter was about 3 times more potent than the former. After oral administration in mice at the dose of 100 mg/kg, rubiscolin-6 showed analgesic activity in tail pinch test. It also stimutated learning performance at the same dose in passive avoidance experiment using step-through apparatus. An immunostimulating peptide, MITLAIPVNKPGR, was isolated from a trypsin digest of soybean protein and named soymetide. Immunostimulating activy of soymetide was mediated by fMLP receptor. Interestingly, after oral administration in rats at a dose of 300 mg/kg (po.), soymetide-4 (MITL) protected alopecia (hair-loss) induced by etoposide, a cancer chemotherapy agent. Stimulation of IL-1 release by the peptide was involved in the mechanism. Ovokinin(2-7), RADHPF, is a vasorelaxing peptide released from ovalbumin by the action of chymotrypsin. It lowered blood pressure of spontaneously hypersensive rats (SHR) after oral administration at a dose of 10 mg/kg. RPLKPW, which was designed by replacing 4 amino acid residues in ovokinin(2-7), exhibited hypotensive activity at a dose of 0.1 mg/kg (po.). This peptides was introduced into 3 homologous sites in soybean beta-conglycinin alpha' subunit by site-directed mutagenesis of the cDNA and expressed in E. coli. The minimum effective dose for hypotensive activity of the genetically modified beta-conglycinin alpha' subunit was 10 mg/kg (po.), which is about 1/200 that of ovalbumin.

• Journal of Animal Science and Technology
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• 제64권6호
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• pp.1132-1143
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• 2022

Insects are a valuable natural source that can produce a variety of bioactive compounds due to their increasing species diversity. CopA3 is an antimicrobial peptide derived from Copris tripartitus (i.e., the dung beetle). It is known to increase the proliferation of colonic epithelial and neuronal stem cells by regulating cell cycle. This research hypothesized that CopA3 can promote the proliferation of porcine muscle satellite cells (MSCs). The effects of CopA3 on porcine MSCs, which are important for muscle growth and regeneration, remain unclear. Here, we investigated the effects of CopA3 on porcine MSCs. According to viability results, we designed four groups: control (without CopA3) and three treatment groups (treated with 5,10, and 25 ㎍/mL of CopA3). At a CopA3 concentration of 5 ㎍/mL and 10 ㎍/mL, the proliferation of MSCs increased more than that observed in the control group. Furthermore, compared to that in the control, CopA3 treatment increased the S phase but decreased the G0/G1 phase ratio. Additionally, early and late apoptotic cells were found to be decreased in the 5 ㎍/mL group. The expressions of the myogenesis-related transcription factor PAX7 and MYOD proteins were significantly upregulated in the 5 ㎍/mL and 10 ㎍/mL groups, whereas the MYOG protein remained undetected in all group. This study suggested that CopA3 promotes muscle cell proliferation by regulating the cell cycle of MSCs and can regulate the activity of MSCs by increasing the expressions of PAX7 and MYOD.

• 한국축산식품학회지
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• 제29권6호
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• pp.659-667
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• 2009

카제인은 우유에서 단백질의 주요 급원으로 알려져 있으며, 이에 따라 카제인 유래 생리활성 펩타이드와 체내 작용에 대한 연구들이 지속적으로 보고되어 왔다. 카제인은 모체단백질 내에서는 불활성을 띄지만 여러 종류의 protease의 작용, 미생물 발효 시 효소적인 가수분해 및 위장에서의 소화를 거치면서 모체단백질에서 방출되어 활성을 띄게 된다. 카제인은 체내에서 흡수된 후 여러 생리활성을 지니게 된다. 먼저 심장혈관계에서 카제인 유래 펩타이드는 ACE 저해활성을 가지므로 고혈압을 예방하는데 도움을 줄 것으로 기대된다. 신경계에서는 opioid 유사물질로서 모르핀과 같은 효과를 나타낸다. 면역계에서는 여러 측면에서 면역기능을 조절한다고 알려져 있으며, 마지막으로 영양계에서는 대표적으로 CPP(caseinophosphopeptide) 및 GMP(glycomacropeptide)가 칼슘, 철과 같은 무기질 흡수에 도움을 준다. 이와 같이 카제인 유래 펩타이드의 다양한 생리활성은 다양한 기능성 유제품에 적용되어왔다. 본고에서는 생리활성 펩타이드의 생성, 흡수 및 흡수기전과 이들의 대표적인 생리활성기능 중 심혈관, 신경, 면역 및 영양에 미치는 영향에 대해 논하였다.

• 한국진공학회:학술대회논문집
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• 한국진공학회 2016년도 제50회 동계 정기학술대회 초록집
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• pp.78-78
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• 2016

For the past three decades, extensive research has been performed in the surface design of new polymers for a variety of medical applications. Great progress in therapeutics and diagnostics can be attributed to these scientific advances in biomedical polymers. A variety of bioinert materials or bioactive materials using drugs, cells, and growth factors are widely utilized for the implants, devices and tissue regeneration. These materials provide an improved biocompatible materials to host, to significantly decrease or increase the host/tissue/blood response to the foreign materials. In the future, biomaterials will play a different role in modern therapeutics. New materials will be tailored to interact more on a protein and cellular level to achieve high degree of biocompatibility, biospecificity and bioacitivity. In this presentation, various biocompatible materials based on surface/bulk engineering will be demonstrated, which can be utilized as therapeutics implants and therapeutic vehicles for biologically active molecules such as cell, protein /peptide and gene.

• 대한방사성의약품학회지
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• 제3권2호
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• pp.113-115
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• 2017

Since the nitrile group is commonly found in natural products and bioactive molecules, many scientists' interest has been focused on the usage of nitrile group. Novel reactions for $^{11}C-labelling$ using nitrile group have been developed, and novel preparation protocols of biomolecules labeled with $^{11}C$ have been studied. In this highlight review, recent researches for the novel labeling reactions using nitrile group are illustrated.

• BMB Reports
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• 제47권7호
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• pp.369-375
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• 2014

Pituitary adenylate cyclase-activating polypeptide (PACAP) is a pleiotropic bioactive peptide that was first isolated from an ovine hypothalamus in 1989. PACAP belongs to the secretin/glucagon/vasoactive intestinal polypeptide (VIP) superfamily. PACAP is widely distributed in the central and peripheral nervous systems and acts as a neurotransmitter, neuromodulator, and neurotrophic factor via three major receptors (PAC1, VPAC1, and VPAC2). Recent studies have shown a neuroprotective role of PACAP using in vitro and in vivo models. In this review, we briefly summarize the current findings on the neurotrophic and neuroprotective effects of PACAP in different brain injury models, such as cerebral ischemia, Parkinson's disease (PD), and Alzheimer's disease (AD). This review will provide information for the future development of therapeutic strategies in treatment of these neurodegenerative diseases.

• Biomolecules & Therapeutics
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• 제27권2호
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• pp.127-133
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• 2019

The study of the genus Streptomyces is of particular interest because it produces a wide array of clinically important bioactive molecules. The genomic sequencing of many Streptomyces species has revealed unusually large numbers of cytochrome P450 genes, which are involved in the biosynthesis of secondary metabolites. Many macrolide biosynthetic pathways are catalyzed by a series of enzymes in gene clusters including polyketide and non-ribosomal peptide synthesis. In general, Streptomyces P450 enzymes accelerate the final, post-polyketide synthesis steps to enhance the structural architecture of macrolide chemistry. In this review, we discuss the major Streptomyces P450 enzymes research focused on the biosynthetic processing of macrolide therapeutic agents, with an emphasis on their biochemical mechanisms and structural insights.

• 대한약학회:학술대회논문집
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• 대한약학회 2003년도 Proceedings of the Convention of the Pharmaceutical Society of Korea Vol.1
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• pp.300.1-300.1
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• 2003

Salmon calcitonin (sCT) is a therapeutic polypeptide hormone consisting of 32 amino acids (3432 Da). As with other bioactive peptide therapeutics, however, therapeutic use of sCT has been limited due to the problems of short circulating half-life and rapid proteolytic degradation. To get over this problem, the three positional isomers of mono-PEGylated sCT were prepared and among these, the best drug candiate for nasal application was chosen. (omitted)

• 한국축산식품학회지
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• 제44권2호
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• pp.299-308
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• 2024

Proteins in whey have prebiotic and antimicrobial properties. Whey protein comprises numerous bioactive proteins and peptides, including glycomacropeptide (GMP), a hydrophilic casein peptide that separates with the whey fraction during cheese making. GMP has traditionally been used as a protein source for individuals with phenylketonuria and also has prebiotic (supporting the growth of Bifidobacterium and lactic acid bacteria) and antimicrobial activities. GMP supplementation may help positively modulate the gut microbiome, help treat dysbiosis-related gastrointestinal disorders and improve overall health in consumers.

• 생명과학회지
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• 제31권2호
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• pp.219-222
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• 2021

본 연구에서는 저분자펩타이드로부터 유래되는 단백질을 확인하기 위해 갈색거저리의 유충, 번데기, 성충의 저분자 단백질체 분석을 수행하였다. 저분자 펩타이드 분석으로부터 유래된 54 단백질이 최종적으로 확인되었다. 확인된 단백질 중 성체에만 존재하는 단백질이 가장 높은 빈도로 존재하였고, 그 다음은 성체와 유충에 동시 존재하는 단백질이 높은 빈도로 탐색되었다. 그러나 번데기를 포함하는 그룹들은 모두 낮은 빈도로 감지되었다. 분석된 단백질에 orthologous classification의 결과에서 일반적 기능 예견만(general function prediction only) 보이는 단백질이 가장 높은 빈도로 조사되었다. 크로마틴 구조와 동적상태(chromatin structure and dynamics)에 연관된 단백질은 비교적 높은 빈도로 탐색되었다. 또한, 아미노산 수송과 물질대사(amino acid transport and metabolism) 및 탄수화물 수송 및 물질대사(carbohydrate transport and metabolism)와 연관된 단백질도 높은 빈도로 분석되었다. 그러나 뉴클레오타이드 수송 물질대사, 코엔자임 수송 및 물질대사, 세포외 구조, 모빌로좀(mobilome), 및 핵 구조와 연관된 단백질은 전혀 탐지되지 않았다. 따라서 크로마틴, 아미노산, 탄수화물 물질대사와 연관된 단백질들이 보다 쉽게 저분자 펩타이드로 전환되어 체액 중에 잔존될 수 있는 것으로 보이며, 이들 펩타이드들이 생리활성물질로써 기능을 수행할 수 있을 가능성이 높은 것으로 추정된다.