摘要:
The folic acid concentration in amino acid producing organisms is reduced or completely removed in order to increase the production of L-serine. The enzymes and genes, which are involved in the biosynthesis of folic acid, can be completely excluded or at least reduced in activity. In a preferred embodiment, SEQ ID NOs: 1-7 are utilized.
摘要翻译:为了增加L-丝氨酸的产生,产生氨基酸的生物体中的叶酸浓度被降低或完全去除。 参与叶酸生物合成的酶和基因可以完全排除或至少降低活性。 在优选的实施方案中,使用SEQ ID NO:1-7。
摘要:
This invention relates to the nucleotide sequence of coryneform bacteria coding for proteins which are involved in L-serine metabolism with reduced and switched off L-serine dehydratase activity. The invention also relates to microorganisms used in methods for producing L-serine.
摘要:
The present invention relates to nucleotide sequences of coryneform bacteria, coding for proteins involved in the bio-synthesis of L-serine and to methods for the isolation thereof. The invention further relates to an improved method for the production of L-serine. In addition, the present invention relates to the use of L-serine in the food, animal feed and/or pharmaceutical industries or in human medicine.
摘要:
The invention relates to nucleotide sequences of coryneform bacteria that encode proteins that are involved in the biosynthesis of L-serine and to a method for producing L-serine. According to the invention, at least 79 amino acids at the C terminus of the wild-type serA sequence are deleted, thereby producing a 3-phosphoglycerate dehydrogenase having a reduced feedback inhibition by L-serine vis-à-vis the wild-type sequence.
摘要:
The invention relates to nucleotide sequences of coryneform bacteria that encode proteins that are involved in the biosynthesis of L-serine and to a method for producing L-serine. According to the invention, at least 79 amino acids at the C terminus of the wild-type serA sequence are deleted, thereby producing a 3-phosphoglycerate dehydrogenase having a reduced feedback inhibition by L-serine vis-à-vis the wild-type sequence.
摘要:
This invention relates to the nucleotide sequence of coryneform bacteria coding for proteins which are involved in L-serine metabolism with reduced and switched off L-serine dehydratase activity. The invention also relates to microorganisms used in methods for producing L-serine.
摘要:
The invention relates to the nucleotide sequences of coryneform bacteria coding for proteins which are involved in L-serine metabolism with reduced and switched off L-serine dehydratase. Said invention also relates to micro-organisms and to methods for producing L-serine.
摘要:
A method is disclosed for microbially producing L-amino acids of aspartate and/or glutamate families which comprises the step of: culturing a strain of Escherichia coli that produces said L-amino acids in a medium suitable for the production of an L-amino acid, whereby said Escherichia coli strain is transformed with a gene construct comprising a polynucleotide encoding an enzyme with pyruvate carboxylase activity.
摘要:
A pyruvate carboxylase gene having SEQ ID NO:1 as well as an amino acid sequence having SEQ ID NO:2 expressed by the pyruvate carboxylate gene are disclosed. Also disclosed is a method for microbial production of amino acids of the aspartate and/or glutamate family in which the pyruvate carboxylase activity is increased by genetically changing the pyruvate carboxylase gene having SEQ ID NO:1 through expression of a microorganism which produces the corresponding amino acid having SEQ ID NO:2.
摘要翻译:公开了具有SEQ ID NO:1的丙酮酸羧化酶基因以及由丙酮酸羧酸酯基因表达的具有SEQ ID NO:2的氨基酸序列。 还公开了一种微生物生产天冬氨酸和/或谷氨酸家族的氨基酸的方法,其中丙酮酸羧化酶活性通过遗传改变具有SEQ ID NO:1的丙酮酸羧化酶基因而增加,通过表达产生相应氨基的微生物 具有SEQ ID NO:2的酸。
摘要:
L-lysine-producing strains of corynebacteria with enhanced lysE gene (lysine export carrier gene), in which strains additional genes chosen from the group comprising the dapA gene (dihydrodipicolinate synthase gene), the lysC gene (aspartate kinase gene), the dapB gene (dihydrodipicolinate reductase gene) and the pyc gene, but especially the dapA gene and the lysC gene (aspartate kinase gene), are enhanced and, in particular, over-expressed, and to a process for the preparation of L-lysine.