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Boakes S.,Novacta Biosystems | Boakes S.,Cantab Biopharmaceuticals | Ayala T.,Novacta Biosystems | Herman M.,Novacta Biosystems | And 5 more authors.
Applied Microbiology and Biotechnology | Year: 2012

The lantibiotic actagardine A is nineteen amino acids in length and comprises three intertwined C-terminal methyllanthionine-bridged rings and an N-terminal lanthionine-bridged ring. Produced by the actinomycete Actinoplanes garbadinensis ATCC 31049, actagardine A demonstrates antibacterial activity against important Gram-positive pathogens. This activity combined with its ribosomal synthesis makes it an attractive target for the generation of lantibiotic variants with improved biological activity. A variant generation system designed to allow the specific substitution of amino acids at targeted sites throughout the actagardine A peptide has been used to generate a comprehensive library by site-directed mutagenesis. With the exception of residues involved in bridge formation, each amino acid in the actagardine A peptide as well as the alanine (ala(0)) at position -1 relative to the mature peptide, has been systematically substituted with all remaining 19 amino acids. A total of 228 mutants have been engineered with 44 produced in good yield. The mutant V15F in particular demonstrates improved activity against a range of notable Gram-positive pathogens including Clostridium difficile, when evaluated alongside actagardine A. The scope of variants generated provides an insight into the flexibility of the actagardine A processing machinery and will undoubtedly assist in future mutational studies. © 2012 Springer-Verlag.


Patent
CANTAB ANTI INFECTIVES Ltd and Novacta Biosystems | Date: 2012-11-16

Provided are compounds, the use of the said compounds in treatment, for example treatment of microbial infections, particularly by Gram negative bacteria. The compounds are polymyxin-based and are represented by the formula (I):


Mothia B.,University College London | Appleyard A.N.,Novacta Biosystems | Wadman S.,Novacta Biosystems | Tabor A.B.,University College London
Organic Letters | Year: 2011

A methodology for the solid-phase synthesis of the overlapping lanthionine bridges found in many lantibiotics has been developed. A novel Teoc/TMSE-protected lanthionine derivative has been synthesized, and this lanthionine, and an Aloc/allyl-protected lanthionine derivative, have been incorporated into a linear peptide using solid-phase peptide synthesis. Selective deprotection of the silyl protecting groups, followed by sequential cyclization, deprotection of the allyl protecting groups, and further cyclization, enabled the regioselective formation of an analogue of rings D and E of nisin. © 2011 American Chemical Society.


Patent
Novacta Biosystems | Date: 2010-02-02

The present disclosure relates to compounds of formula (II): pharmaceutical compositions comprising same and use of the compounds and compositions for the treatment of microbial infection, particularly Methicillin-resistant Staphylococcus aureus (MRSA) infection.


Patent
Novacta Biosystems | Date: 2011-08-09

Described is a A liquid colloidal pharmaceutical formulation of a type B lantibiotic for infusion or direct injection comprising a type B lantibiotic or a salt thereof, an isotonic aqueous solution comprising a sugar alcohol such as glycerol and/or a saccharide and optionally a buffer, wherein said final formulation for infusion or direct injection is clear of visual particulates.


This invention relates to characterisation of the biosynthetic gene cluster for the lantibiotic actagardine, identification of a novel variant of actagardine and its biosynthetic cluster, and methods of production and use of actagardine, a novel actagardine variant, herein referred to as actagardine B, and variants of both of these produced according to this invention, utilizing genes from the characterised biosynthetic gene clusters.


Patent
Novacta Biosystems | Date: 2011-07-12

Described is a pharmaceutical formulation of a capsule for oral delivery of a type B lantibiotic to the stomach comprising a hard gelatine, HPMC or starch capsule, and a type B lantibiotic of formula (I): wherein X is NH(CH_(2))_(q)NH_(2 )and q is an integer 2 to 12.


This invention relates to characterisation of the biosynthetic gene cluster for the lantibiotic actagardine, identification of a novel variant of actagardine and its biosynthetic cluster, and methods of production and use of actagardine, a novel actagardine variant, herein referred to as actagardine B, and variants of both of these produced according to this invention, utilizing genes from the characterised biosynthetic gene clusters.


Patent
Novacta Biosystems | Date: 2010-01-12

The present invention pertains generally to certain compounds of the deoxyactagardine A and B type. Such compounds are suitable for use in the treatment of microbial infections, for example Clostridium infection, such as C. perfringens, C. difficile, C. tetani, and/or C. botulinum, in particular C. difficile, especially infection of the colon and/or lower intestines and diarrhea associated with the microbial infection.


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