인문학
사회과학
자연과학
공학
의약학
농수해양학
예술체육학
복합학
지원사업
학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
커뮤니티
연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
초록·키워드
Lignocellulosic biomass is a sustainable feedstock for biorefineries, but inefficient xylose utilization limits microbial bioproduction. Here, the oleaginous yeast Yarrowia lipolytica was engineered to produce succinic acid (SA) from xylose by resolving metabolic and regulatory conflicts. Initial overexpression of xylose catabolic genes (XR, XDH, XK) in an SA-hyperproducing strain did not activate xylose utilization, indicating underlying cryptic constraints. Adaptive evolution identified critical mutations (Snf1<sup>R78W</sup>, Scp1<sup>delGTC</sup>) that globally downregulated downstream pathways, including glycolysis and β-oxidation, restoring growth using xylose but reducing SA production. To overcome this trade-off, a random expression library strategy incorporating multi-copy amplification of XR, XDH, and XK genes via nonhomologous end joining (NHEJ) was employed. This approach significantly enhanced xylose utilization and SA production, achieving 83.78 g L<sup>-1</sup> SA from corn stover hydrolysate at pH 3.5 (yield: 0.66 g g<sup>-1</sup> mixed sugars; productivity: 1.21 g L<sup>-1</sup> h<sup>-1</sup>). Mechanistic studies revealed that fatty acid metabolism drives a futile cycle converting cytosolic NADPH to mitochondrial NADH, essential for SA biosynthesis via the reductive TCA pathway. This cycle competitively inhibits xylose catabolism unless pathway genes are amplified to balance cofactor demand. This work highlights the importance of fatty acid metabolism in Y. lipolytica for SA biosynthesis, cofactor rebalancing, and pathway cross-talks.
인공지능 문자 인식 모델을 통해 추출된 텍스트로, 일부 오타나 오류가 포함될 수 있으나 지속적으로 개선 중입니다.
오류를 발견하셨다면 해당 부분을 드래그한 후 ' 를 통해 신고해주세요.
오류를 발견하셨다면 해당 부분을 드래그한 후 ' 를 통해 신고해주세요.