Nonionic Cleavable Surfactant for MS Proteomics
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Solution Overview
Problem
Conventional surfactants used in proteomics interfere with mass spectrometry (MS) analysis, leading to sample loss and reduced throughput due to their deleterious effects on MS signals and common protein/peptide separation techniques, and are often denaturing, making them unsuitable for non-denaturing applications.
Innovation Solution
Development of nonionic cleavable surfactants (NCS) with a disulfide bond that can be chemically cleaved using reducing agents or collisional fragmentation, allowing for the removal of surfactants before MS analysis without denaturing proteins, thus enhancing compatibility with MS-based proteomics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional surfactants are used for cell lysis and protein solubilization, then protein extraction efficiency is improved, but MS signal quality deteriorates due to deleterious effects on mass spectrometry signals and separation techniques
Solution Approach 1:
The surfactant molecule is segmented into two functional parts: a hydrophobic tail for membrane disruption and a hydrophilic head group that is MS-compatible. This segmentation allows the surfactant to perform its solubilization function while the MS-compatible head group minimizes interference with mass spectrometry signals.
Solution Approach 2:
The invention changes the chemical parameters of the surfactant by using nonionic or zwitterionic head groups instead of traditional anionic or cationic groups. This parameter change reduces the surfactant's interference with MS signals while maintaining its protein solubilization capability.
2Quantity of substance
If conventional surfactants are used for membrane protein solubilization, then solubility of hydrophobic species is improved, but sample loss increases due to interference with separation techniques and need for removal
Solution Approach 1:
The harmful surfactant components are extracted or removed from the system before MS analysis. The protocol includes steps to eliminate surfactants that could cause sample loss, ensuring that the solubilization benefit is maintained while the interfering substance is removed.
Solution Approach 2:
The invention changes the physical-chemical parameters of the surfactant to be more compatible with downstream applications, reducing the need for extensive removal steps and minimizing sample loss during processing.
3Reliability
If anionic acid-cleavable surfactants are used for proteomics, then MS compatibility after degradation is improved, but protein denaturation occurs making them unsuitable for non-denaturing applications
Solution Approach 1:
The surfactant is designed with local quality differentiation: the head group is engineered to be non-denaturing or zwitterionic to preserve protein native structure, while the overall surfactant molecule maintains MS-compatible properties after degradation through appropriate tail group selection.
Solution Approach 2:
The surfactant combines different chemical components with complementary properties: a non-denaturing or zwitterionic head group for protein structure preservation and a hydrophobic tail that provides MS-compatible degradation products, creating a composite molecule that satisfies multiple requirements.
4Ease of manufacture
If anionic photocleavable surfactants are used for proteomics, then cleavage capability is improved, but MS signal suppression increases making them suboptimal for high-sensitivity applications
Solution Approach 1:
The invention changes the chemical parameters of the surfactant by selecting nonionic or zwitterionic head groups that do not suppress MS signals, in contrast to anionic surfactants. This parameter change maintains cleavage capability while improving MS signal intensity for high-sensitivity applications.
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 NCS enable streamlined characterization of proteins, including membrane proteins, by reducing MS interference, improving solubility, and maintaining non-denaturing conditions, suitable for both top-down and bottom-up proteomics and structural applications like crystallography and microscopy.
Implementation Method 1
the cleavable disulfide bond is able to release the hydrophilic head, release the hydrophobic tail, and/or break apart upon exposure to a reducing agent
Implementation Method 2
The resulting cleavage products are more easily removed prior to MS analysis and/or provide reduced MS interference
Data Source
AI summary
The present invention provides nonionic cleavable surfactants (NCS), specifically n-Decyl-disulfide-β-D-maltoside (DSSM), suitable for MS-based proteomics and analysis. These surfactants are designed to mimic the properties of a commonly used surfactant in structural biology, n-dodecyl-β-d-maltoside (DDM), but contain a disulfide bond that allows for facile cleavage and surfactant removal before analysis. DSSM and other NCS are compatible with native mass spectrometry, top-down and bottom-up proteomics, ESI-MS and other analytical techniques, and reduce signal suppression typically observed with other surfactants. DSSM and other NCS provide versatile surfactants that can facilitate protein sample preparation under non-denaturing conditions for a myriad of proteomic and structural biology applications and act as a general replacement for DDM.