The present invention relates to an L-cysteine-producing mutant microorganism having introduced therein genes encoding enzymes which are involved in the L-cysteine metabolic pathway, and more particularly to an L-cysteine-producing mutant microorganism having introduced therein cysE, cysK and cysR, which are genes encoding enzymes which are involved in the L-cysteine metabolic pathway, and to a method of producing L-cysteine using the mutant microorganism. According to the present invention, L-cysteine can be produced with high efficiency as a result of regulating metabolic fluxes associated with the L-cysteine metabolic pathway of the mutant microorganism and regulating a system for supplying a sulfur source essential for synthesis of L-cysteine.

The present invention relates to an L-cysteine-producing mutant microorganism having introduced therein genes encoding enzymes which are involved in the L-cysteine metabolic pathway, and more particularly to an L-cysteine-producing mutant microorganism having introduced therein cysE, cysK and cysR, which are genes encoding enzymes which are involved in the L-cysteine metabolic pathway, and to a method of producing L-cysteine using the mutant microorganism. According to the present invention, L-cysteine can be produced with high efficiency as a result of regulating metabolic fluxes associated with the L-cysteine metabolic pathway of the mutant microorganism and regulating a system for supplying a sulfur source essential for synthesis of L-cysteine.