Recombinant PSL1b Lectin for Alpha(2,6)-Sialic Acid Detection
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Solution Overview
Problem
Current lectins used for detecting sialic acid-containing glycoconjugates lack specificity, particularly in distinguishing alpha(2,3)-, alpha(2,6)-, and alpha(2,8)-linkages, and are often contaminated with isolectins, leading to non-specific binding and inaccurate measurements.
Innovation Solution
A recombinant lectin protein, PSL1b, specifically binding to alpha(2,6)-linked sialic acid is produced by expressing the Polyporus squamosus-derived isolectin gene in E. coli or yeast, allowing for accurate detection of glycoproteins, glycopeptides, and glycolipids with sialic acid moieties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional lectins are used to detect sialic acid-containing glycoconjugates, then detection capability is achieved, but measurement precision deteriorates due to inability to distinguish alpha(2,3)-, alpha(2,6)-, and alpha(2,8)-linkages and contamination with isolectins
Solution Approach 1:
The patent extracts and isolates a specific lectin component (PSL1b) from the complex mixture of conventional lectins. By purifying the Polyporus squamosus lectin to obtain the specific PSL1b isoform, the invention removes contaminating isolectins that cause non-specific binding, thereby achieving high specificity for alpha(2,6)-linked sialic acid detection without cross-reactivity with other linkage types
Solution Approach 2:
The patent confers specific binding properties to the PSL1b lectin for recognizing alpha(2,6)-linked sialic acid moieties. This local quality enhancement allows the lectin to selectively bind to a specific glycan structure (alpha(2,6)-Neu5Ac) while ignoring other sialic acid linkages, enabling precise distinction between different linkage types that conventional lectins cannot differentiate
2Ease of manufacture
If lectins are extracted from natural bioresources, then detection function is obtained, but manufacturing precision deteriorates due to isolectin contamination causing non-specific binding
Solution Approach 1:
The patent applies extraction and purification techniques to isolate the specific PSL1b lectin from the crude lectin mixture obtained from Polyporus squamosus. Through chromatographic purification methods, the invention separates PSL1b from contaminating isolectins, achieving high purity lectin preparation that maintains ease of manufacture while eliminating non-specific binding issues
Solution Approach 2:
The patent utilizes chromatographic separation parameters (such as ion exchange, affinity, or size exclusion chromatography conditions) to purify PSL1b from isolectin contaminants. By optimizing purification parameters like pH, ionic strength, and ligand selection, the invention achieves high manufacturing precision in lectin preparation while maintaining a feasible purification process
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The recombinant PSL1b lectin effectively measures and quantifies glycoproteins and glycolipids with alpha(2,6)-linked sialic acid, providing a specific and accurate tool for monitoring microorganisms and understanding life phenomena mediated by glycoconjugates.
Implementation Method 1
Lectins are multivalent carbohydrate binding proteins that display neither catalytic activity nor antibody like characteristics. Lectin...is one of the proteins that can bind to sugar chains, which is involved in various life phenomena
Data Source
AI summary
The present invention relates to a method for producing a Polyporus squamosus-derived PSL1b recombinant lectin, which binds specifically to sialic acid containing glycoconjugates, from an Escherichia coli PSL1b strain (deposit number: KCTC12507BP) or a Pichia pastoris PSL1b strain (deposit number: KCTC12500BP) and a lectin produced thereby. The recombinant lectin of the present invention can be useful as an active ingredient of a composition or a kit for measuring or detecting glycoproteins, glycopeptides, glycolipids, sugar precursors, or oligosaccharides having sialic acid moieties.