A diagnostic assay for detecting an occurrence of a stroke event in a mammalian subject. The assay comprises the steps of: (i) separating a plasma fraction from a blood sample collected from the mammalian subject; (ii) quantifying in the plasma fraction a L-glutamine hydroxylamine glutamyl transferase (L-GHGT) activity; (iii) quantifying in the plasma fraction a gamma glutamyl hydroxamate synthetase (GGHS) activity; (iv) adding together or alternatively calculating the combinatorial probability for the quantified L-GHGT activity and the quantified GGHS activity to produce a value for the net glutamine synthetase activity, and (v) correlating the net glutamine synthetase activity value with net glutamine synthetase activity values from healthy subjects to detect an occurrence of a stroke event in the mammalian subject. Also disclosed are kits comprising reagents and instructions for performing a diagnostic assay to detect and quantify L-GHGT activity and/or GGHS activity.

The present invention is related to a polypeptide comprising an amino acid sequence, whereby the amino acid sequence of the polypeptide is at least 80% identical to a stretch of consecutive amino acids of the region of HPGGT comprising an amino acid sequence corresponding to SEQ.ID.No. 1, whereby such region is defined by (a) amino acid positions 150 to 200 of the amino acid sequence according to SEQ.ID.No.1, or (b) amino acid positions 410 to 480 of the amino acid sequence according to SEQ.ID.No.1, and
whereby the polypeptide is suitable to elicit an immune response which is capable of inhibiting the catalytic activity of HPGGT.

Provided herein are photocrosslinking reagents, crosslinkable proteins displaying photocrosslinking groups, crosslinked protein-protein complexes, and methods of use thereof.

Provided herein are systems and methods for screening and analyzing compounds based upon the elucidation of the interaction among cereblon, its substrates and certain compounds or agents. As an example, a system and method can include a computational model that mimics in silico the cereblon protein. Also provided herein are systems and methods for identifying a compound that induces a conformational change in Cereblon, and in particular P98A mutant cereblon.

A dry chemical test strip with multiple layers of membranes based on concentration gradient, comprising a substrate, an indicator layer, a reagent layer and a diffusion layer, further comprises a concentration gradient layer. Wherein a first reagent is uniformly applied on the reagent layer, a second reagent is applied on the concentration gradient layer. The concentration gradient increment of the second reagent is 0 in the width direction of the test strip, and is a constant or a function of the variable of length in the length direction of the test strip, a chromogenic reagent is uniformly applied on the indicator layer. The dry chemical test strip with multiple layers of membranes based on concentration gradient can allow all the testing and analysis procedures to be directly carried out on the test strip, test results to be directly obtained on the spot without the help of instruments.

A method for simultaneously measuring the activities of multiple kinds of enzymes in single channel through concimitantly monitoring multiple wavelength absorbances is claimed; based on linear additivity of absorbances and the isoabsorbance wavelengths of chromogenic substrates and their chromogenic products, both the principles for the combination of chromogenic substrates required for simultaneously measuring the activities of multiple kinds of enzymes in single channel through concimitantly monitoring multiple wavelength absorbances and an approach for data processing to eliminate the interference of the overlapped absorbances are developed, kinetic analysis of reaction curves via numerical integration eliminates the interference of all substrates and products and estimates the maximal reaction rates of the enzymes to be measured, giving the linear ranges and the limits of quantification for simultaneously measuring the activities of multiple kinds of enzymes in single channel comparable to those by separate assays; the present invention is applicable for simultaneously measuring the activities of multiple kinds of enzymes in biological samples, simultaneously measuring multiple components by enzyme-labeled immunoassays, screening simultaneously of inhibitors against multiple targets, for the practice in clinical biochemical analyses, clinical immunoassays, health laboratory analyses, the discovery of inhibitors, and the basical researches which need the present invention.

A dry chemical test strip with multiple layers of membranes based on concentration gradient, comprising a substrate, an indicator layer, a reagent layer and a diffusion layer, further comprises a concentration gradient layer. Wherein a first reagent is uniformly applied on the reagent layer, a second reagent is applied on the concentration gradient layer. The concentration gradient increment V of the second reagent is 0 in the width direction of the test strip, and is a constant or a function of the variable of length in the length direction of the test strip, a chromogenic reagent is uniformly applied on the indicator layer. The dry chemical test strip with multiple layers of membranes based on concentration gradient can allow all the testing and analysis procedures to be directly carried out on the test strip, test results to be directly obtained on the spot without the help of instruments.

Described and featured are compositions, a system and methods for identifying and selecting substrates of E3 ligases by ubiquitin biotinylation. The components of the compositions, system and methods are ubiquitin- and interaction-specific, thereby providing the enrichment and identification of endogenous or exogenous E3 ligase substrate molecules that are proximally ubiquitinated and biotinylated by components designed to interact both physically and functionally in the compositions, system and methods. The compositions, system and methods are useful and advantageous for identifying and selecting E3 ligase substrates (and/or associated molecules) that are modulated or induced by other agents, such as immunomodulatory imide agents (IMiDs), molecular glues and bifunctional proteolysis targeting chimeras (PROTACs).