Outer surface proteins, their genes, and their use

a technology of outer surface proteins and genes, applied in the field of identification of outer surface proteins and their genes, can solve the problems of septicaemia, pneumonia, severe septicaemia and pneumonia, and complex septicaemia

Inactive Publication Date: 2006-05-18
EMERGENT PROD DEV UK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0014] Because of the extracellular or cell surface location, the peptides of the present invention may be suitable candidates for the production of therapeutically-effective vaccines against GBS. The term “therapeutically-effective” is intended to include the prophylactic effect of vaccines. For example, a vaccine may comprise a peptide according to the invention, or the means for its expression, for the treatment of infection.

Problems solved by technology

This infection usually begins in utero and causes severe septicaemia and pneumonia in infants, which is lethal if untreated and even with treatment is associated with a 10-20% mortality rate.
It causes a septicaemia, which is complicated by meningitis in 90% of cases.
This, in turn, leads to reduced milk production and is therefore of considerable economic importance.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0044] A first plasmid was termed MS4. The cloned DNA fragment was sequenced and the nucleotide and deduced amino acid sequence (SEQ ID NO. 1 and 2) was used to search protein databases.

[0045] Homologues to the GBS MS4 gene product can be identified in Clostridium perfingens, Haemophilus influenzae, Neisseria flavescens and Thermatoga maritima. In all cases the homologues are the genes for Ornithine Carbamoyltransferase (OCT). In eukaryotic systems this enzyme catalyses the second step in the Urea cycle, the conversion of ornithine to citrulline, a reaction requiring carbomyl phosphate. In prokaryotes, ODC is one of the three enzymes involved in Arginine Deaminase activity—a system which protects bacteria from acid damage. In particular, ODC is responsible for the conversion of citrulline to ornithine and carbamoyl phosphate (the opposite role to that in eukaryotes) (Casiano-Colon, A and Marquis, R. E. 1988. Appl. Environ. Microbiol. 54: 1318-1324, Cunin, R. et al. 1986. Microbiol....

example 2

[0047] A second plasmid was termed MS11. The nucleotide and deduced amino acid sequence (SEQ ID NOS. 3 and 4) were used to search protein databases.

[0048] Homologues to the GBS MS11 gene product can be identified in Lactobacillus delbrueckii, Thermotoga maritima, Clostridium acetobulylicum, Bacillus megaterium, Triticum aestivium and Synechocystis PCC6803.

[0049] In all cases the homologues are the genes for the protein Phosphoglycerate Kinase (PGK). PGK is a major enzyme in the glycolytic pathway, being involved in the conversion of Glyceraldehyde-3-phosphate to Phosphoenolpyruvate. In particular, it is involved in the catalysis of the reaction between Glycerate-1,3-diphosphate and 3-Phospho-Glycerate, releasing a phosphate in the forward reaction.

example 3

[0050] A third plasmid was termed pMS16. The 5′ and 3′ cloned DNA fragments were sequenced and the nucleotide and deduced amino acid sequences for each are shown as SEQ ID NOS. 5 and 6 for the 5′ fragment and SEQ ID NOS. 7 and 8 for the 3′ fragment.

[0051] Homologues to the GBS MS16 gene product can be identified in Bacillus stearothermophilus, Bacillus subtilis and Mycoplasma genitalium.

[0052] In all cases the homologues are the genes for the protein Glucose-6-Phosphate Isomerase (GPI).

[0053] The enzyme Glucose-6-Phospate Isomerase catalyses the reaction between Glucose-6-phosphate and Fructose-6-Phosphate in both glycolysis (G6P to F6P) and gluconeogenesis (F6P to G6P). Mutations in the gpi gene have been shown to confer purine analogue sensitivity to organisms.

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Abstract

According to the present invention, a series of genes are identified in Group B Streptococcus, the products of which may be located on the outer surface of the organism. The genes, or functional fragments thereof, may be useful in the preparation of therapeutics, e.g. vaccines for the immunization of a patient against microbial infection.

Description

FIELD OF THE INVENTION [0001] This invention relates to the identification of outer surface proteins, their genes, and their use. More particularly, it relates to their use in therapy, for immunisation and in screening for drugs. BACKGROUND TO THE INVENTION [0002] Group B Streptococcus (GBS), also known as Streptococcus agalactiae, is the causative agent of various conditions. In particular, GBS causes: Early Onset Neonatal Infection. [0003] This infection usually begins in utero and causes severe septicaemia and pneumonia in infants, which is lethal if untreated and even with treatment is associated with a 10-20% mortality rate. Late Onset Neonatal Infection. [0004] This infection occurs in the period shortly after birth until about 3 months of age. It causes a septicaemia, which is complicated by meningitis in 90% of cases. Other focal infections also occur including osteomyelitis, septic arthritis, abscesses and endopthalmitis. Adult Infections. [0005] These appear to be incre...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): A61K39/02C12Q1/68G01N33/554C07K14/31A61K31/7088C12N15/09A61K38/00A61K38/44A61K38/45A61K38/46A61K38/52A61K39/00A61K39/09A61P31/04C07KC07K14/315C07K16/12C12N1/15C12N1/19C12N1/21C12N5/10C12N9/02C12N9/10C12N9/12C12N9/22C12N9/92C12N15/53C12N15/54C12N15/55C12N15/61C12N15/62C12R1/46G01N33/53
CPCA61K38/00A61K39/00C07K14/315C07K2319/00C12N9/92C12N9/1018C12N9/1217C12N9/22C12N9/0008A61P13/02A61P27/02A61P31/00A61P31/04
Inventor HUGHES, MARTINSANTANGELO, JOSEPHLANE, JONATHANFELDMAN, ROBERTMOORE, JOANNEDOBSON, RICHARDEVEREST, PAULHENWOOD, CAROLINEDOUGAN, GORDONWILSON, REBECCA
Owner EMERGENT PROD DEV UK
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