High Mannose Glycan Detection via Enzymatic Cleavage and Targeted MS

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Solution Overview

Problem

Current methods are inadequate for accurately analyzing and controlling high mannose glycan structures in glycoproteins, particularly in complex mixtures, due to their structural diversity and low abundance, which affects the biological and clinical attributes of glycoprotein products.

Innovation Solution

A method involving enzymatic treatment, mass spectrometry, and electrophoretic analysis to identify and quantify high mannose glycoforms in glycoprotein preparations, including buffer exchange and targeted MS experiments, to measure the presence, abundance, and ratios of high mannose structures, enabling high-resolution and high-throughput analysis.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If conventional analytical methods are used to analyze high mannose glycan structures, then the analysis can be performed with standard equipment, but the detection precision and quantification accuracy are insufficient due to structural diversity and low abundance

Engineering Contradiction:

Improvedetection precisionVSAvoidmethod complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent segments the complex glycan analysis into distinct stages: enzymatic treatment to release glycans, buffer exchange to prepare samples, and targeted mass spectrometry for quantification. This segmentation allows each step to be optimized independently, achieving high detection precision for low-abundance high mannose structures while managing overall method complexity through systematic organization of procedures

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent introduces buffer exchange as an intermediary step between enzymatic treatment and mass spectrometry analysis. This intermediary process removes interfering substances and prepares the sample in a state suitable for high-precision mass spectrometry detection, thereby enabling accurate quantification of low-abundance high mannose glycans without requiring overly complex direct detection methods

Inventive Principle:

Principle #24Intermediary (Mediator)

2Measurement precision

If high-resolution analysis methods are applied to separately identify individual glycoforms, then the measurement precision is improved, but the analysis time and processing throughput are reduced

Engineering Contradiction:

Improveglycoform identification precisionVSAvoidanalysis throughput

Core Design Contradiction:

Measurement precisionVSProductivity

Solution Approach 1:

The patent performs preliminary enzymatic treatment to release glycans and buffer exchange to optimize sample conditions before mass spectrometry analysis. These preliminary actions prepare the sample in advance, enabling the mass spectrometry instrument to operate at high resolution without extending overall analysis time, thus maintaining both high measurement precision and acceptable productivity

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent utilizes targeted mass spectrometry experiments that monitor specific m/z signatures corresponding to high mannose-containing glycoforms. By changing the detection parameters to focus on specific mass-to-charge ratios rather than performing full-spectrum analysis, the method achieves high-resolution identification of individual glycoforms while maintaining high throughput capability

Inventive Principle:

Principle #35Parameter changes

3Measurement precision

If enzymatic treatment is used to remove higher abundance glycans, then the detection of low abundance high mannose structures is improved, but the process time and procedural complexity increase

Engineering Contradiction:

Improvelow abundance glycan detectionVSAvoidsample preparation time

Core Design Contradiction:

Measurement precisionVSLoss of time

Solution Approach 1:

The patent extracts high mannose glycans from the complex glycoprotein mixture through targeted enzymatic treatment. By specifically designing enzymes to release only high mannose structures while leaving other glycans intact, the method achieves selective extraction that improves detection precision without requiring time-consuming separation procedures, as the target glycans are directly released and can be immediately analyzed

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The enzymatic treatment and buffer exchange are performed as preliminary actions before mass spectrometry analysis. These steps are optimized to complete quickly, removing interfering high-abundance glycans and preparing the sample in advance, thereby enabling rapid detection of low-abundance high mannose structures without significantly increasing overall process time

Inventive Principle:

Principle #10Preliminary action

4Loss of information

If comprehensive glycosylation analysis is performed to monitor all glycan structures, then the information completeness is improved, but the complexity of data interpretation and process control increases

Engineering Contradiction:

Improveglycosylation information completenessVSAvoiddata analysis complexity

Core Design Contradiction:

Loss of informationVSDevice complexity

Solution Approach 1:

The patent applies targeted mass spectrometry experiments that focus specifically on monitoring high mannose-containing glycoforms rather than analyzing all glycan structures comprehensively. This localized approach maintains sufficient information completeness for quality control purposes by concentrating detection efforts on the specific glycosylation patterns that affect biological and clinical attributes, while significantly reducing data analysis complexity compared to comprehensive glycosylation profiling

Inventive Principle:

Principle #3Local quality

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

This method allows for precise detection and quantification of high mannose structures in glycoproteins, even at low abundance, facilitating quality control and optimization of glycoprotein production processes, such as in therapeutic antibody production, by providing detailed glycosylation patterns and enabling real-time monitoring of glycosylation in production systems.

Implementation Method 1

treating the glycoprotein sample with an enzyme that cleaves complex fucosylated glycans from the glycoprotein, e.g., treating with Endoglycosydase F3

Methodology Applied

Scientific EffectEnzymatic cleavage: Enzyme

Implementation Method 2

identifying and/or quantifying high mannose-containing glycoforms in the treated sample (e.g., by electrophoretic methods such as capillary electrophoresis (CE); reverse phase LC-MS or targeted reverse phase-LC-MS)

Methodology Applied

Scientific EffectMass spectrometry:

Implementation Method 3

identifying and/or quantifying high mannose-containing glycoforms in the treated sample (e.g., by electrophoretic methods such as capillary electrophoresis (CE))

Methodology Applied

Scientific EffectCapillary electrophoresis: Capillary Electrophoresis