Abstract:
The invention relates to a method of aiding detection of a surface abnormality in the oesophagus of a subject, wherein said surface abnormality is selected from the group consisting of low-grade dysplasia (LGD), high-grade dysplasia (HGD), asymptomatic oesophageal adenocarcinoma (OAC) and intra-mucosal cancer (IMC), the method comprising: a) providing a sample of cells from said subject, wherein said sample comprises cells collected from the surface of the subject's oesophagus; 10 b) assaying said cells for at least two markers selected from (i) p53; (ii) c-Myc; (iii) AURKA or PLK1, preferably AURKA; and (iv) methylation of MyoD and Runx3; wherein detection of abnormal levels of at least two of said markers infers that the subject has an increased likelihood of a surface abnormality in the oesophagus. The invention also relates to certain kits, apparatus and uses.
Abstract:
The invention relates to a method for aiding prediction of the likelihood of progression from Barrett's esophagus to high grade dysplasia or esophageal adenocarcinoma in a subject, the method comprising (a) providing an oesophagal sample from said subject (b) determining if said sample stains abnormally with Aspergillus oryzae lectin; (c) determining if there is a DNA content abnormality in said sample; and (d) determining if there is low grade dysplasia in said sample; wherein if (b) is abnormal and (c) is abnormal and low grade dysplasia is present, then an increased likelihood of progression is determined. The invention also relates to an apparatus, and to different uses of certain materials.
Abstract:
The invention relates to a polypeptide comprising an amino acid having a norbornene group. Suitably said norbornene group is present as an amino acid residue of a norbornene lysine. The invention also relates to a method of producing a polypeptide comprising a norbornene group, said method comprising genetically incorporating an amino acid comprising a norbornene group into a polypeptide. The polypeptide comprising the norbornene group can be specifically labelled by inverse electron demand Diels-Alder reaction with a tetrazine compound.
Abstract:
In the past decade a great deal of structural information for class A-GPCRs (G protein-coupled receptors) has emerged. However, the structural and electronic basis of ligand selectivity for closely related receptor subtypes such as the angiotensin receptors AT1aR and AT2R, which present completely diverse biological functions in response to the same ligand, is poorly understood. In order to monitor complex responses in bio systems it is useful to have ligands that present a gradient in terms of selectivity. In this study we present an efficient method to tune ligand selectivity for the two angiotensin II receptor subtypes, AT1aR and AT2R, by controlling aromatic - prolyl interactions in angiotensin II, through alternation of aromatic electronics. On the basis of this strategy, an AT2R selective and high affinity agonist analogue (Ki=3 nM) was obtained.
Abstract:
The invention relates to a method of modifying a specific lysine residue in a polypeptide comprising at least two lysine residues, said method comprising (a) providing a polypeptide comprising a target lysine residue protected by a first protecting group, and at least one further lysine residue; (b) treating the polypeptide to protect said further lysine residue(s), wherein the protecting group for said further lysine residues is different to the protecting group for the target lysine residue; (c) selectively deprotecting the target lysine residue; and (d) modifying the deprotected lysine residue of (c).
Abstract:
The invention relates to a method for providing a multispecific peptide ligand comprising a polypeptide covalently linked to a molecular scaffold at three or more amino acid residues and capable of binding to two or more separate targets, comprising the steps of: (a) providing a first repertoire of polypeptides, each polypeptide comprising two or more reactive groups capable of covalent linkage to a molecular scaffold, and at least one loop which comprises a sequence of two or more amino acids subtended between two of said reactive groups; (b) providing a second repertoire of polypeptides as described in (a); (c) joining at least one loop of one or more members of the first repertoire to at least one loop of one or more members of the second repertoire to form at least one polypeptide comprising two loops, and (d) conjugating the composite polypeptide(s) to a molecular scaffold at at least three amino acid positions.
Abstract:
The invention relates to a tRNA synthetase capable of binding Ne-acetyl lysine, wherein said synthetase comprises a polypeptide having at least 90 % sequence identity to the amino acid sequence of MbPyIRS, and wherein said synthetase comprises a L266M mutation.
Abstract:
The invention relates to a method of making a polypeptide comprising an orthogonal functional group, said orthogonal functional group being comprised by an aliphatic amino acid or amino acid derivative, said method comprising providing a host cell; providing a nucleic acid encoding the polypeptide of interest; providing a tRNA-tRNA synthetase pair orthogonal to said host cell; adding an amino acid or amino acid derivative comprising the orthogonal functional group of interest, wherein said amino acid or amino acid derivative is a substrate for said orthogonal tRNA synthetase, wherein said amino acid or amino acid derivative has an aliphatic carbon backbone; and incubating to allow incorporation of said amino acid or amino acid derivative into the polypeptide of interest via the orthogonal tRNA-tRNA synthetase pair. The invention also relates to certain amino acids, and to polypeptides comprising same.
Abstract:
The invention relates to a method of detecting an altered behaviour in a population of cells, said method comprising determining at least one of the following characteristics of the population of cells; (i) the proportion of stem cells, proliferating cells and differentiated cells in said cell population; or (ii) the size of stem cell clusters in said cell population; or (iii) the separation of stem cell clusters in said cell population; and comparing said at least one characteristic to a reference value, wherein a difference between the determined value and the reference value indicates an altered behaviour in said population of cells. Preferably the cells are mammalian, more preferably human epithelial cells, more preferably human epidermal cells.
Abstract:
The present invention relates to the use of an antagonist of kisspeptin in the manufacture of a medicament for the treatment of a condition induced and/or worsened by kisspeptin activity in an individual. The invention also provides certain defined peptide molecules, which may act as an antagonist of kisspeptin, which are of use in treating a condition induced and/or worsened by kisspeptin activity in an individual. In addition, the invention provides methods of identifying and/or using antagonists of kisspeptin and/or the defined peptides, and pharmaceutical compositions thereof.