Journal of the Korean Society of Food Science and Nutrition (한국식품영양과학회지)

The Korean Society of Food Science and Nutrition (한국식품영양과학회)
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Isolation and Characterization of Helicobacter pylori Urease Inhibitor from Rubus coreanus Miquel

복분자(Rubus coreanus Miquel)로부터 Helicobacter pylori Urease Inhibitor의 분리 및 특성

  • Published : 2004.06.01
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Abstract

A Helicobacter pylori urease inhibitor from Rubus coreanus Miquel has been isolated and partially characterized for aiming to Prevent H. pylori growth and decrease harmful accumulation of ammonia in human gastric mucosa. We screened urease inhibitory activities in 519 extracts library prepared by solvent extraction from 173 kinds of edible plants, medicinal herbs, herbs and seaweeds using a colorimetric urease assay system. As results of primary and secondary screening, 70% acetone extract of Rubus coreanus Miquel was selected as potent candidate, showing about 24% inhibitory activity. The acetone extract was sequentially partitioned into RCE/RCWI and RCB/RCW2 layers with ethyl acetate and butanol. The major active component in RCW2, water layer from butanol fractionation was revealed to be peptidic or proteinous substance by inhibitory activity determination after pronase digestion and periodate oxidation. RCW2-IIIc a was isolated by sequential column chromatography on DEAE-Toyopearl 650C, Butrl-Toyopearl 650M and Sephadex LH-20. The isolated urease inhibitor RCW2-IIIc $\alpha$, was highly pure proteinous substance with molecular weight of 13kDa by high-performance gel permeation liquid chromatography. RCW2-IIIc$\alpha$ has about 5 times higher inhibitory activity than 70％ acetone extract, showing high stability against heat treatment and peptic digestion.

위염과 위궤양의 일차적 발병 인자로 알려진 Helicobacter pylori의 생육을 억제하고 urease 산물인 암모니아의 축적에 의한 위점막 손상을 완화시킬 목적으로 복분자로부터 H. pylori urease저해물질을 분리정제하고 소재화와 관련된 일부 성질을 규명하였다. 양념 채소류, 차류, 죽류, 건강채소류등의 식용식물, 약용식물, 허브 및 해조류, 총 173종으로부터 극성도에 따라 계통추출한 수용성인 냉수추출물(Fr, 1), methanol 추출물(Fr.4), 열수추출물(Fr.5) 519점을 대상으로 H. pylori urease 저해활성을 검색하였다. 1차 및 2차 저해활성 검색 결과 복분자의 70% acetone추출물이 약 24%의 가장 높은 저해활성을 나타내었으며, 이 추출물을 ethyl acetate와 butanol을 사용하여 ethyl acetate/DW layer(RCE/RCWl)와 butanol/DW layer(RCB/RCW2)로 순차 분획한 후 활성획분인 RCW2 내의 활성 본체를 확인할 목적으로 periodate oxidation과 pronase digestion을 실시한 결과 펩타이드 또는 단백질성 물질로 판명되었다. 저해활성 물질은 DEAE-Toyopearl 650C, Butyl-Toyopearl 650M 및 Sephadex LH-20순의 column chromatography에 의 해 분리 정제되었다. 분리 urease 저해물질, RCW2-IIIc $\alpha$는 HPLC의 gel permeation chromatography에 의해 비교적 순도 높은 분자량 약 13 kDa의 단일 물질임이 확인되었다. 저해활성물질은 열에 안정성을 보이 는 내열성 단백질임을 알 수 있었고 위내 단백분해효소인 pepsin에도 가수분해 저항성을 나타냄으로써 기능성식품의 소재로 높은 소재화 적성을 보였다.

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