An O-phosphoserine (OPS) export protein variant, and a method for producing O-phosphoserine, cysteine, and cysteine derivatives using the same.

Methods and fluid compositions are provided for decreasing an amount of sulfur-containing compounds in downhole fluids and/or subterranean reservoir wellbores by including at least one enzyme destabilizer in a fluid composition. The fluid composition may then be circulated into a subterranean reservoir wellbore. The fluid composition may further include a base fluid and at least one sulfur producing enzyme. The base fluid may be or include, but is not limited to, drilling fluids, servicing fluids, production fluids, completion fluids, injection fluids, refinery fluids, and combinations thereof. The enzyme destabilizer(s) may be destabilize the sulfur producing enzymes and thereby decrease an amount of sulfur-containing compounds produced vis-à-vis the sulfur producing enzyme(s).

The present invention relates to a microorganism, wherein the activity of a polypeptide capable of exporting O-phosphoserine (OPS) is enhanced, and a method of producing O-phosphoserine, cysteine, or a cysteine derivative using the microorganism.

Provided is a method of recovering phosphoric acid from a fermentation broth or a waste liquid thereof and reusing the recovered phosphoric acid in fermentation.

The present application relates to a microorganism producing O-phosphoserine and a method for producing O-phosphoserine, cysteine or a cysteine derivative using same.

The present application relates to a microorganism producing O-phosphoserine and a method for producing O-phosphoserine, cysteine or a cysteine derivative using same.

The present invention relates to a microorganism, wherein the activity of a polypeptide capable of exporting O-phosphoserine (OPS) is enhanced, and a method of producing O-phosphoserine, cysteine, or a cysteine derivative using the microorganism.

The present application relates to a recombinant microorganism, in which the expression of NADH:quinone oxidoreductase is regulated, and a method for producing O-phosphoserine, cysteine, and cysteine derivatives using the same.

The present invention provides methods for the production of cysteine or derivates thereof by culturing a microorganism having reduced activity of endogenous phosphoserine phosphatase and the activity of PhnC, PhnD, and PhnE is reduced, and enhanced activity of phosphoglycerate dehydrogenase and/or phosphoserine aminotransferase. The O-phosphoserine produced by such an organism can then be reacted with a sulfide in the presence of a sulfydrylase or a microorganism expressing a sulfhydrylase to produce cysteine or a derivative thereof. Microorganisms having these reduced and enhanced properties noted above are also provided herein.

The present invention provides methods for the production of cysteine or derivates thereof by culturing a microorganism having reduced activity of endogenous phosphoserine phosphatase. The O-phosphoserine produced by such an organism can then be reacted with a sulfide in the presence of a sulfydrylase or a microorganism expressing a sulfhydrylase to produce cysteine or a derivative thereof. Microorganisms having the properties noted above are also provided herein.