A detailed in silico analysis of different strategies for enhancement of bioethanol production by Scheffersomyces stipitis, = Pichia stipitis, using validated genome-scale metabolic model is presented. Glucose inhibition on xylose uptake is dominant in S. stipitis which makes fed-batch fermentation more effective for higher sugar concentrations. Bioethanol production potential of S. stipitis can be improved by growth media modification by introducing certain amino acids in small quantities. Slower sugar uptake by S. stipitis can be overcome by community-culture with recombinant Escherichia coli strain ZSC113, which has a higher xylose uptake rate. Ethanol yield and productivity of community-culture can be further enhanced by genetic modification of E. coli strain ZSC113.