Abstract:
The present invention provides methods to engineer microorganisms for the production of C30-aldehyde carotenoids. Specifically, various combinations of crtM, sqs, crtN and crtN2 genes from Staphylococcus aureus and Methylomonas sp. 16a can be co-expressed in transformant hosts, leading to the production of diaponeurosporene monoaldehyde, diapocarotene monoaldehyde, and/or diapocarotene dialdehyde. In a preferred embodiment, the genetically engineered pathway is introduced into a strain of Escherichia coli that has been engineered for the expression of carotenoids, and the C30-carotenoid product is diapocarotene dialdehyde.
Abstract:
This invention provides prokaryotic glycosyltransferases, including a bifunctional sialyltransferase that has both an null2,3- and an null2,8-activity. A null1,4-GalNAc transferase and a null1,3-galactosyltransferase are also provided by the invention, as are other glycosyltransferases and enzymes involved in synthesis of lipooligosaccharide (LOS). The glycosyltransferases can be obtained from, for example, Campylobacter species, including C. jejuni. In additional embodiments, the invention provides nucleic acids that encode the glycosyltransferases, as well as expression vectors and host cells for expressing the glycosyltransferases.
Abstract:
A process for the preparation of D-pantothenic acid and/or salts thereof or feedstuffs additives comprising these by fermentation of microorganisms of the Enterobacteriaceae family, in particular those which already produce D-pantothenic acid, in which the nucleotide sequence(s) in the microorganisms which code(s) for the cysK gene is/are enhanced, in particular over-expressed.
Abstract:
The invention provides a transformation system based on bacteriophage Mx9, a temperate phage that infects Myxococcus xanthus. Vectors containing an integrase-encoding gene and a phage attachment site (attP) integrate into a chromosomal attB site and can be used to alter or introduce genes into a variety of host cells.
Abstract:
The present invention provides An isolated polypeptide which has proline specific endoprotease activity, selected from the group consisting of:(a) a polypeptide which has an amino acid sequence which has at least 40% amino acid sequence identity with amino acids 1 to 526 of SEQ ID NO:2 or a fragment thereof;(b) a polypeptide which is encoded by a polynucleotide which hybridizes under low stringency conditions with (i) the nucleic acid sequence of SEQ ID NO:1 or a fragment thereof which is at least 80% or 90% identical over 60, preferably over 100 nucleotides, more preferably at least 90% identical over 200 nucleotides, or (ii) a nucleic acid sequence complementary to the nucleic acid sequence of SEQ ID NO:1.
Abstract translation:本发明提供了具有脯氨酸特异性内切蛋白酶活性的分离多肽,其选自:(a)多肽,其具有与SEQ ID NO:1至526的氨基酸至少具有40%氨基酸序列同一性的氨基酸序列 或其片段;(b)由在低严格条件下与(i)SEQ ID NO:1的核酸序列或其片段至少80%的杂交的多核苷酸编码的多肽, 或超过200个核苷酸的90%以上,优选超过100个核苷酸,更优选至少90%相同,或(ii)与SEQ ID NO:1的核酸序列互补的核酸序列。
Abstract:
A process for the production of ergosterol and its intermediate products using recombinant yeasts and plasmids for transformation of yeasts is described.
Abstract:
A method for producing human-like glycoproteins by expressing a Class 2 null-mannosidase having a substrate specificity for Mannull1,3 and Mannull1,6 glycosidic linkages in a lower eukaryote is disclosed. Hydrolysis of these linkages on oligosaccharides produces substrates for further N-glycan processing in the secretory pathway.
Abstract:
This invention provides prokaryotic glycosyltransferases, including a bifunctional sialyltransferase that has both an null2,3- and an null2,8-activity. A null1,4-GalNAc transferase and a null1,3-galactosyltransferase are also provided by the invention, as are other glycosyltransferases and enzymes involved in synthesis of lipooligosaccharide (LOS). The glycosyltransferases can be obtained from, for example, Campylobacter species, including C. jejuni. In additional embodiments, the invention provides nucleic acids that encode the glycosyltransferases, as well as expression vectors and host cells for expressing the glycosyltransferases.
Abstract:
High level expression of heterologous proteins in host cells is frequently limited by the presence of rarely utilized codons, due to depletion of the internal tRNA pool and stalling of translation. This invention provides expression host cells generated by introduction of a vector for the expression of an array of tRNA genes that are rare in the host cells. The modified host cells are capable of efficiently supporting expression of selected recombinant genes which otherwise would be limited by the presence of rare codons.
Abstract:
The present invention relates to a method of screening for constitutively active mutants of a desired eukaryotic MAPK pathway member of a MAPK pathway member, comprising the steps of (a) providing a mutant yeast strain devoid of an upstream kinase; (b) providing a DNA library of different mutants of a mutagenized gene coding for the desired MAPK pathway member; (c) introducing said library into said yeast strain under conditions suitable for activation of the yeast MAPK pathway; (d) detecting an end-point indication for activation of the yeast pathway; and (e) optionally isolating said constitutively activated mutant from selected rescued clones. The invention further relates to isolated constitutively active mutants of the MAPK pathway member, and their various uses particularly, in a method of screening for substances which are inhibitors of a MAPK pathway, and in drug design.