A method for the use of a transgenic plant for production of a compound comprising: harvesting a transgenic plant or part thereof expressing a modified protein having a target protein and an intein fused internally within the target protein in such a position that the intein presence inactivates the activity of the target protein, wherein the intein has the ability to cleave and ligate the modified protein in cis conformation and the activity of the target protein is recoverable upon induction of intein splicing, the target protein is a lignocellulosic degrading protein, the intein is selected from the group consisting of an intein from Pyrococcus spp. polymerase, the Psp pol intein, and the coding sequence of the Psp pol intein is amplifiable by a PCR reaction using primers of SEQ ID NOS: 5 and 6; mechanically processing the transgenic plant or part thereof; combining the mechanically processed transgenic plant or part thereof with a non-transgenic plant in a proportion of transgenic plant: non-trangsenic plant greater than zero; and chemically processing the combination of the mechanically processed transgenic plant or part thereof and the non-transgenic plant under conditions effective for obtaining the compound wherein the compound is selected from the group consisting of glucose, fructose, xylose, phenol, glycerol, mannose, lactic acid, acetic acid, ethylene, propylene, toluene, ethyl benzene, styrene, xylene, ethylene glycol, butadiene, formaldehyde, isopropanol, acetone, butanediol, methanol, ethanol, propanol, butanol, propanediol, vitamins, methane, ethane, propane, butane, pentane, hexane, heptane, octane, octanol, benzene, and biopolymers. harvesting a transgenic plant or part thereof expressing a modified protein having a target protein and an intein fused internally within the target protein in such a position that the intein presence inactivates the activity of the target protein, wherein the intein has the ability to cleave and ligate the modified protein in cis conformation and the activity of the target protein is recoverable upon induction of intein splicing, the target protein is a lignocellulosic degrading protein, the intein is selected from the group consisting of an intein from Pyrococcus spp. polymerase, the Psp pol intein, and the coding sequence of the Psp pol intein is amplifiable by a PCR reaction using primers of SEQ ID NOS: 5 and 6; mechanically processing the transgenic plant or part thereof; combining the mechanically processed transgenic plant or part thereof with a non-transgenic plant in a proportion of transgenic plant: non-trangsenic plant greater than zero; and chemically processing the combination of the mechanically processed transgenic plant or part thereof and the non-transgenic plant under conditions effective for obtaining the compound wherein the compound is selected from the group consisting of glucose, fructose, xylose, phenol, glycerol, mannose, lactic acid, acetic acid, ethylene, propylene, toluene, ethyl benzene, styrene, xylene, ethylene glycol, butadiene, formaldehyde, isopropanol, acetone, butanediol, methanol, ethanol, propanol, butanol, propanediol, vitamins, methane, ethane, propane, butane, pentane, hexane, heptane, octane, octanol, benzene, and biopolymers.