Microbiology and Biotechnology Letters (한국미생물·생명공학회지)

The Korean Society for Microbiology and Biotechnology (한국미생물·생명공학회)
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The Mechanisms for Xylose Transport into Yeasts

효모내로의 Xylose 운반 기작

  • Han, Ji-Hye (Department of Bioprocess Engineering, Chonbuk National University) ;
  • Choi, Gi-Wook (Changhae Institute of Cassava and Ethanol Research, Changhae Ethanol Co., Ltd.) ;
  • Chung, Bong-Woo (Department of Bioprocess Engineering, Chonbuk National University) ;
  • Min, Ji-Ho (Department of Bioprocess Engineering, Chonbuk National University)
  • 한지혜 (전북대학교 생물공정공학과) ;
  • 최기욱 ((주) 창해에탄올 창해연구소) ;
  • 정봉우 (전북대학교 생물공정공학과) ;
  • 민지호 (전북대학교 생물공정공학과)
  • Received : 2010.02.27
  • Accepted : 2010.03.15
  • Published : 2010.03.28
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Abstract

The biochemical study of sugar uptake in yeasts started five decades ago and led to the early production of abundant kinetic and mechanistic data. However, the first accurate overview of the underlying sugar transporter genes was obtained relatively late, due mainly to the genetic complexity of hexose uptake in the model yeast, Saccharomyces cerevisiae. The genomic era generated in turn a massive amount of information, allowing the identification of a multitude of putative sugar transporter and sensor-encoding genes in yeast genomes, many of which are phylogenetically related. This review aims to briefly summarize our current knowledges on the biochemical and molecular features of the transporters of pentoses in yeasts, when possible establishing links between previous kinetic studies and genomic data currently available. Emphasis is given to recent developments concerning the identification of D-xylose transporter genes, which are thought to be key players in the optimization of S. cerevisiae for bioethanol production from lignocellulose hydrolysates.

S. cerevisias의 치명적인 약점인 xylose 또는 arabinose가 상당부분을 차지하는 hemicellulose 기수분해물인 오탄당 발효의 극히 낮은 효율은 유전자 변형 및 대사적 흐름을 조절하여 세포 내로의 오탄당 섭취 및 활용 증가를 위한 연구가 꾸준히 진행되고 있다. S. cerevisie에서 오탄당은 육탄당보다 1-2 배 낮은 친화력을 가지고 있어, 오탄당 운반은 이를 이용한 바이오에탄올 발효에 있어서 중요한 초기 조절 단계이다. 오탄당 이용가능 S. cereivsiae에서 오탄당 운반기의 발현 관련 소수의 연구가 보고되고는 있으나 아직까지 눈에 띠는 효율 증기눈 보교되지 않았다. 최근 보고된 S. cerevisiae에서 C. intermeda 유래의 glucose/xylose의 확산을 용이하게 하는 운반기와 공동수송기의 이종발현이 처음으로 활성화 되었음이 보고 되었다. 따라서 그러므로 높은 친화력의 xylose 운반기의 발현은 이미 xylose로 부터 바이오에탄올 발효공정은 최적화되어 있지만 여전히 몇 가지 제한 요소들을 가지고 있는 S. cerevisiae 균주들의 xylsoe 발효공정 효율 향상에 큰 기여를 할 수 있을 것으로 기대된다.

Keywords

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