Korean Journal of Microbiology (미생물학회지)

The Microbiological Society of Korea (한국미생물학회)
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Characterization and N Terminal Amino Acid Sequence Analysis of Catechol 1,2-Dioxy-genase from Benzoate Degrading Acinetobacter sp. KS-1

Benzoate 분해세균 Acinetobacter sp. kS-1에서 분리된 catechol 1,2-dioxygenase의 특성 및 N 말단 아미노산 서열 분석

  • 오계헌 (순천향대학교 자연과학대학 생명과학부) ;
  • 송승열 (순천향대학교 자연과학대학 생명과학부) ;
  • 김승일 (기초과학지원연구원 프로테옴분석팀) ;
  • 윤경하 (순천향대학교 자연과학대학 생명과학부)
  • Published : 2002.06.01
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Abstract

The purpose of this work was to investigate the characterization and sequence of catechol 1,2-dioxygenase (Cl,2O) purified from Acinetobacter sp. KS-1 which was grown on benzoate as a sole carbon source. Cl,2O demonstrated its enzyme activity to catechol and 4-methylcatechol. The optimum temperature of Cl,2O was $35^{\circ}C$, and the optimal pH was in the range from pH 7.5 to 9.0. $Ag^{+}$, $Hg^{+}$, and $Cu^{2+}$ showed inhibitory effect on the activity of Cl,2O. Molecular weight of the enzyme was determined to approximately 36 kDa by SDS-PAGE and 7-terminal amino acid sequence of Cl,2O was analyzed as $^{1}MNYQQIDALVKQMNVDTAKG^{20}$and exhibited 95% sequence homology with that of Cl,2O from Acinetobacter radioresistens In addition, trypsin digestion and peptide mapping were performed for internal sequencing analysis. Molecular weights of three digested peptide fragments were analyzed as 966.3 Da, 1933.8 Da and 2081.7 Da by MALDI-TOF, which were matched with each internal sequences $^{1}SQSDFNLRR^{9}\, ^{1}HGNRPSHVHYFNSAPGYR^{18}\, ^{1}TIEGPLYVAGAPESVGFAR^{19}$) of. A. radioresistens. PCR product was amplified with the degenerated primers derived from N-terminal and each internal amino acid sequences.

단일 탄소원 및 에너지원으로 benzoate를 이용하는 Acinetobacter sp. KS-1에서 분리 정제한 catechol 1,2-dioxygenase (Cl,2O)의 특성과 아미노산 서 열을 분석하였다. Cl,2O는 catechol과 4-methylcatechol에 대해서 효소활성을 나타내었으며, 활성 최적온도는 $35^{\circ}C$이고, 활성 최적 pH는 7.5-9.0의 범위 내에 있었다. 효소활성 저해제로서 은, 수은, 그리고 구리는 Acinetobacter sp. KS-1의 Cl,2O 활성을 억제하였다. SDS-PAGE에 의해 측정된 Cl,2O의 분자량은 약 36 kDa 였으며, N-말단 아미노산 서 열을 분석한 결과, $^{1}MNYQQIDALVKQMNVDTAKG^{20}$로 Acinetobacter radioresistens의 Cl,2O와 95%의 유사성을 보여주었다. In-gel 아미노산 서열 분석을 위하여 trypsin 처리와 peptide mapping을 실시하였다. MALDI-TOF를 이용하여 trypsin으로 처리된 세 개의 peptide flagmen써 분자량을 분석한 결과 966.3 Da, 2081.7 Da, 그리고 1933.8 Da으로 각각 나타났는데, 이는 A. radioresistens의 Cl,2O와 내부 서 열$^{1}SQSDFNLRR^{9}\, ^{1}HGNRPSHVHYFNSAPGYR^{18}\, ^{1}TIEGPLYVAGAPESVGFAR^{19}$ 이 일치하는 것으로 분석되었다. N-말단 서열과 내부 서열을 바탕으로 primer를 제작하여 polymerase chain reaction을 실시하였다.

Keywords

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