Microbiology and Biotechnology Letters (한국미생물·생명공학회지)

The Korean Society for Microbiology and Biotechnology (한국미생물·생명공학회)
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Production of Xylooligosaccharides by Yeast Cell Surface-Displayed Endoxylanase

효모 세포 표면 발현된 Endoxylanase를 이용한 Xylooligosaccharides의 생산

  • Kim, Hyun-Jin (Department of Biomaterial Control, Dong-Eui University) ;
  • Lee, Jae-Hyung (Department of Biomaterial Control, Dong-Eui University) ;
  • Kim, Yeon-Hee (Department of Biomaterial Control, Dong-Eui University) ;
  • Nam, Soo-Wan (Department of Biomaterial Control, Dong-Eui University)
  • 김현진 (동의대학교 바이오물질제어학과) ;
  • 이재형 (동의대학교 바이오물질제어학과) ;
  • 김연희 (동의대학교 바이오물질제어학과) ;
  • 남수완 (동의대학교 바이오물질제어학과)
  • Published : 2008.12.28
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Abstract

The yeast surface expression system, pCTXYN (6.8 kb), of Bacillus endoxylanase gene (xynB, 642 bp) was constructed and introduced into Saccharomyces cerevisiae EBY100 cell. The transformed yeast cell showing the highest endoxylanase activity was selected through the active staining of colonies grown on YPDG medium containing xylan. With the yeast transformant, EBY100/pCTXYN, grown on galactose containing medium, it was found that the endoxylanase was successfully displayed on the yeast cell surface and the xylooligosaccharides were efficiently produced from xylan. The most of endoxylanase activity was detected in the cell fraction and reached about 1.9 unit/mL after 48 h cultivation. The optimized conditions for xylooligosaccharides production from xylan were determined as follows: substrate and its concentration, oat spelt xylan 6%; concentration of yeast whole-cell, 5 unit/mL; temperature, $50^{\circ}C$, and reaction time $2{\sim}4\;h$. When the oat spelts xylan and corncob xylan were hydrolyzed by treatment with cell surface-displayed endoxylanase, xylotriose was formed as a main product.

Bacillus sp. endoxylanase 유전자(xynB, 642 bp)의 효모 표면발현계 pCTXYN(6.8 kb)를 구축하고 Saccharomyces cerevisiae EBY100에 형질전환시켜 형질전환체 EBY100/pCTXYN를 얻었다. 형질전환체들을 xylan이 포함된 YPDG 배지에서 배양 후 활성염색을 통하여 고찰성의 형질전환체를 최종 선별하였다. 갈락토스 배지에서 자란 효모 형질전환체로부터 xynB는 성공적으로 표면발현되었고, xylan으로 부터 xylooligosaccharides를 효율적으로 생성함도 화인하였다. Endoxylanase 활성은 세포분획에서만 검출되었고 배양 48시간에 최종 1.9 unit/mL의 활성을 보였다. Xylooligosaccharides 생산을 위한 치적 반응 조건으로, 기질과 농도는 oat spelt xylan 6%, 효모 생촉매 농도는 5 unit/mL, 반응온도는 $50^{\circ}C$, 반응시간은 $2{\sim}4$시간이었다 효모 생촉매를 oat spelt xylan과 corncob xylan에 처리한 결과, xylotriose가 주성분이었다.

Keywords

References

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