203 results about "Neisseria meningitidis" patented technology

A conjugate vaccine for Neisseria meningitidis comprising lipooligosaccharide which does not contain a lacto-N-tetraose antigen from which at least one primary O-linked fatty acid has been removed conjugated to an immunogenic carrier. The vaccine is useful for prevention of meningitis and septic shock in mammals.

A composition comprising (a) Neisseria meningitidis serogroup B outer membrane vesicles (OMVs), and (b) an immunogenic component selected from other Neisseria proteins, or immunogenic fragments thereof. Component (b) preferably includes a protein from a different NmB strain from that from which the OMV of component (a) is derived. The OMVs are preferably obtained by deoxycholate extraction. Optionally, the composition may also comprise a protective antigen against other pathogens.

The present invention relates to compositions including an isolated non-pyruvylated non-lipidated ORF2086 polypeptide, and methods thereof. In an exemplary embodiment, the compositions described herein are immunogenic. The present invention further relates to compositions that elicit a bactericidal immune response in a mammal against an ORF2086 subfamily B polypeptide from serogroup B Neisseria meningitidis, and methods related thereto.

The present invention generally provides methods and compositions for eliciting an immune response against Neisseria spp. bacteria in a subject, particularly against a Neisseria meningitidis serogroup B strain.

The invention belongs to the field of gene engineering and discloses a target sequence identified by a CRISPR-Cas9 system from neisseria meningitidis. The target sequence is as shown in the nth-24th sites of optional one of SEQ ID No. 1-20, and n=1-9. The invention further discloses sgRNA and coding DNA molecules thereof, the sequence of the sgRNA is 5'-identificiation sequence-sequence recruiting Cas9 protein-3', and the DNA sequence corresponding to the identification sequence is identical with the target sequence. The invention also discloses the CRISPR-Cas9 system which comprises the Cas9 protein, the sgRNA and/or a coding sequence carrying the Cas9 protein and a vector of the coding sequence of the sgRNA. The invention also discloses application of the CRISPR-Cas9 system to editing of CCR5 genes and preparation of medicine for HIV infection. By the CRISPR-Cas9 system, the CCR5 genes can be edited, and cells cannot be infected by HIV.

In one aspect, the invention relates to an isolated polypeptide comprising an amino acid sequence that is at least 95% identical to SEQ ID NO: 71. In another aspect, the invention relates to an immunogenic composition including an isolated non-lipidated, non-pyruvylated ORF2086 polypeptide from Neisseria meningitidis serogroup B, and at least one conjugated capsular saccharide from a meningococcal serogroup.

The invention belongs to the field of gene engineering and discloses a target sequence identified by a CRISPR-Cas9 system from neisseria meningitidis. The target sequence is as shown in the nth-24th sites of optional one of SEQ ID No. 1-15, and n=1-9. The invention further discloses sgRNA and coding DNA molecules thereof, the sequence of the sgRNA is 5'-identificiation sequence-sequence recruiting Cas9 protein-3', and the DNA sequence corresponding to the identification sequence is identical with the target sequence. The invention also discloses the CRISPR-Cas9 system which comprises the Cas9 protein, the sgRNA and/or a coding sequence carrying the Cas9 protein and a vector of the coding sequence of the sgRNA. The invention also discloses application of the CRISPR-Cas9 system to editing of CXCR4 genes and preparation of medicine for HIV infection. By the CRISPR-Cas9 system, the CXCR4 genes can be edited, and cells cannot be infected by HIV.

The present invention broadly relates to polynucleotide sequences encoding porin polypeptides of Neisseria. More particularly, the invention relates to newly identified nucleic acid sequence mutations in polynucleotides encoding PorA polypeptides of Neisseria meningitidis, wherein these sequence mutations result in increased expression levels of PorA polypeptides.

DNA-based methods employing amplification primers or probes for detecting, identifying, and quantifying in a test sample DNA from (i) any bacterium, (ii) the species Streptococcus agalactiae, Staphylococcus saprophyticus, Enterococcus faecium, Neisseria meningitidis, Listeria monocytogenes and Candida albicans, and (iii) any species of the genera Streptococcus, Staphylococcus, Enterococcus, Neisseria and Candida are disclosed. DNA-based methods employing amplification primers or probes for detecting, identifying, and quantifying in a test sample antibiotic resistance genes selected from the group consisting of blatem, blarob, blashv, blaoxa, blaZ, aadB, aacC1, aacC2, aacC3, aacA4, aac6'-lla, ermA, ermB, ermC, mecA, vanA, vanB, vanC, satA, aac(6')-aph(2''), aad(6'), vat, vga, msrA, sul and int are also disclosed. The above microbial species, genera and resistance genes are all clinically relevant and commonly encountered in a variety of clinical specimens. These DNA-based assays are rapid, accurate and can be used in clinical microbiology laboratories for routine diagnosis. These novel diagnostic tools should be useful to improve the speed and accuracy of diagnosis of microbial infections, thereby allowing more effective treatments. Diagnostic kits for (i) the universal detection and quantification of bacteria, and/or (ii) the detection, identification and quantification of the above-mentioned bacterial and fungal species and/or genera, and/or (iii) the detection, identification and quantification of the above-mentioned antibiotic resistance genes are also claimed.

Novel proteins that constitute modified forms of a Neisseria meningitidis surface antigen and encoding nucleic acids are provided. The modified surface proteins are characterized by having deletions of non-conserved amino acids, and thereby being capable of eliciting cross-protective immune responses against Neisseria meningitidis. The invention extends to the use of the modified surface antigens in diagnostics, in therapeutic and prophylactic vaccines and in the design and/or screening of medicaments. The modified surface antigens are particularly useful in vaccines which effectively immunize against a broader spectrum of N. meningitidis strains than would be expected from a corresponding wild-type surface antigen.

Novel bactericidal antibodies against Neisseria meningitidis serogroup B (“MenB”) are disclosed. The antibodies either do not cross-react or minimally cross-react with host tissue polysialic acid and hence pose minimal risk of autoimmune activity. The antibodies are used to identify molecular mimetics of unique epitopes found on MenB or E. coli K1. Examples of such peptide mimetics are described that elicit serum antibody capable of activating complement-mediated bacteriolysis of MenB. Vaccine compositions containing such mimetics can be used to prevent MenB or E. coli K1 disease without the risk of evoking autoantibody.

fHBP is a protein in Neisseria meningitidis. Three families of fHBP are known. To increase the ability of a fHBP protein to elicit antibodies that are cross-reactive between the families, fHBP is selected or engineered to have a sequence which can elicit broad-spectrum bactericidal anti-meningococcal antibodies after administration to a host animal.

A highly conserved, immunologically accessible antigen at the surface of Neisseria meningitidis organisms. Immunotherapeutic, prophylactic and diagnostic compositions and methods useful in the treatment, prevention an diagnosis of Neisseria meningitidis diseases. A proteinase K resistant Neisseria meningitidis surface protein having an apparent molecular weight of 22 kDa, the corresponding nucleotide and derived amino acid sequences (SEQ ID NO: 1, NO:3, NO:5 and NO:7: SEQ ID NO: 2, NO:4, NO:6, and NO:8), recombinant DNA methods for the production of the Neisseria meningitidis 22 kDA surface protein, and antibodies that bind to the Neisseria meningitidis 22 kDA surface protein.

Capsular polysaccharides containing multiple sialic acid residues, particularly the Group B polysaccharide of Neisseria meningitidis, are modified by chemical reaction to randomly introduce pendant reactive residues of heterobifunctional linker molecules to the polysaccharide backbone. The capsular polysaccharide is deacetylated and the heterobifunctional linker molecule is reacted with the deacetylated material and any residual amino groups are blocked by reaction with alkyl acid anhydride. The introduction of the linker molecules to the polysaccharide chain between the termini enables the polysaccharide to be linked to a carrier molecule, such as a protein, to enhance the immunogenicity of the polysaccharide. The conjugate molecule may be formulated as an immunogenic composition for raising antibodies in a host to the polysaccharide.