The present disclosure relates to a novel microorganism with plastic (polystyrene)-degrading activity and its use, and newly discovered strains of Pseudomonas lini JNU 01 and Acinetobacter johnsonii JNU 01 capable of degrading plastic, especially polystyrene, and has the effect of providing a method for degrading plastic using the same.

A method of treating a cancer, the method comprising: providing a genetically modified macrophage or monocyte that contains a nucleic acid sequence encoding a Hom-1 polypeptide or a fragment thereof that contains the Hom-1 homeobox domain, wherein the nucleic acid sequence is operably linked to a heterologous promoter and the modified macrophage or monocyte expresses the Hom-1 polypeptide or the fragment thereof; and administering the modified macrophage or monocyte to a subject with a cancer.

The present invention generally relates to the microbiological industry, and specifically to the production of L-serine using genetically modified bacteria. The present invention provides genetically modified microorganisms, such as bacteria, wherein the expression of genes encoding for enzymes involved in the degradation of L-serine is attenuated, such as by inactivation, which makes them particularly suitable for the production of L-serine at higher yield. The present invention also provides means by which the microorganism, and more particularly a bacterium, can be made tolerant towards higher concentrations of serine. The present invention also provides methods for the production of L-serine or L-serine derivative using such genetically modified microorganisms.

Provided is a method of producing L-amino acids by using a recombinant coryneform microorganism in which the expression of a target gene is weakened by using a gene transcription inhibition method.

Provided is a method of producing L-amino acids by using a recombinant coryneform microorganism in which the expression of a target gene is weakened by using a gene transcription inhibition method.

The present invention relates to the technical field of microbial engineering. Specifically disclosed are a recombinant microorganism, a method for constructing same and use thereof. According to the present invention, by means of constructing a phosphate acetyltransferase-inactivated strain and applying the strain to the production of threonine, the threonine-producing ability of the strain is remarkably improved, and the strain has a remarkably increased production of threonine as compared to an unmodified strain. Combined with attenuated expression or inactivation of acetate kinase, HTH-type transcriptional regulator and the like, as well as improved activity of pyruvate carboxylase and enzymes involved in a threonine synthesis-related pathway, the production of threonine is further improved. The described modifications can be used in the fermentative production of threonine and have relatively good application value.

An engineered pathway for carbon fixation without rubisco incorporates carbon dioxide into fructose-6-phosphate.

The present invention provides a method for constructing a threonine-producing engineered bacterium. According to the present invention, a 2-methylcitrate synthase 1-inactivated strain (Corynebacterium) is applied to the production of threonine, and the production of threonine produced by the 2-methylcitrate synthase 1-inactivated strain is increased by about 42% compared with that produced by an unengineered strain. When the application of the 2-methylcitrate synthase 1-inactivated strain is further combined with enhanced expression of at least one of aspartate aminotransferase, aspartate kinase, homoserine dehydrogenase, threonine synthase, NAD kinase, fructose-1,6-bisphosphatase 2 and the like in the threonine synthesis pathway, the production of threonine is improved. The method provides a new way for large-scale production of threonine and has high application value.

Provided are a recombinant microorganism for producing threonine and the use thereof in the fermentation production of threonine or a derivative thereof. A 20-30 bp segment upstream of a start codon of a gene encoding phosphoenolpyruvate carboxylase in the recombinant microorganism is replaced with a strong promoter. By means of the specific optimization of the promoter of the gene encoding phosphoenolpyruvate carboxylase and the mutation of the encoding region of the gene, the ability of the strain to synthesize threonine is significantly improved.

A method of treating a cancer, the method comprising: providing a genetically modified macrophage or monocyte that contains a nucleic acid sequence encoding a Hom-1 polypeptide or a fragment thereof that contains the Hom-1 homeobox domain, wherein the nucleic acid sequence is operably linked to a heterologous promoter and the modified macrophage or monocyte expresses the Hom-1 polypeptide or the fragment thereof; and administering the modified macrophage or monocyte to a subject with a cancer.