{"id":16915,"date":"2025-07-27T13:46:57","date_gmt":"2025-07-27T13:46:57","guid":{"rendered":"https:\/\/www.sygnaturediscovery.com\/blog\/why-membrane-proteins-matter-and-why-theyre-so-hard-to-study\/"},"modified":"2025-07-27T13:46:57","modified_gmt":"2025-07-27T13:46:57","slug":"why-membrane-proteins-matter-and-why-theyre-so-hard-to-study","status":"publish","type":"blog","link":"https:\/\/www.sygnaturediscovery.com\/fr\/blog\/why-membrane-proteins-matter-and-why-theyre-so-hard-to-study\/","title":{"rendered":"Why Membrane Proteins Matter \u2013 and Why They\u2019re So Hard to Study!"},"content":{"rendered":"\n<h2 class=\"wp-block-heading has-dark-blue-500-color has-text-color has-link-color has-text-3-xl-font-size wp-elements-9a843345684e5d37a7e9faab17bd193e\">Over the coming months, we\u2019ll be sharing a series of blog posts and case studies that aim to spotlight our work on membrane proteins: from protein production and structural biology to biophysical characterisation and drug discovery.\u00a0<\/h2>\n\n\n\n<p>But before diving into the details, it\u2019s worth stepping back to ask two fundamental questions:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Why do membrane proteins matter?<\/li>\n\n\n\n<li>Why is working with them so uniquely challenging?<\/li>\n<\/ul>\n\n\n\n<figure class=\"wp-block-image size-full has-custom-border\" style=\"margin-top:var(--wp--preset--spacing--40);margin-bottom:var(--wp--preset--spacing--40)\"><img loading=\"lazy\" decoding=\"async\" width=\"233\" height=\"328\" src=\"https:\/\/www.sygnaturediscovery.com\/wp-content\/uploads\/2025\/12\/Lego-ATP-Synthase.webp\" alt=\"\" class=\"wp-image-5933\" style=\"border-radius:14px;object-fit:cover\" srcset=\"https:\/\/www.sygnaturediscovery.com\/wp-content\/uploads\/2025\/12\/Lego-ATP-Synthase.webp 233w, https:\/\/www.sygnaturediscovery.com\/wp-content\/uploads\/2025\/12\/Lego-ATP-Synthase-213x300.webp 213w\" sizes=\"(max-width: 233px) 100vw, 233px\"><\/figure>\n\n\n\n<h3 class=\"wp-block-heading has-dark-blue-500-color has-text-color has-link-color has-text-2-xl-font-size wp-elements-fb38e29c6318f9fd5754c31af7c1fb81\">Why do we work with membrane proteins?<\/h3>\n\n\n\n<p>Personally, I believe that membrane proteins are among the most fascinating and functionally critical molecules in biology. These molecular machines are embedded in or associated with the phospholipid bilayer that surrounds every cell, acting as gatekeepers, messengers, and regulators of cellular behaviour.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Membranes are essential for life. Every living cell is defined by its membrane \u2014 a dynamic, selectively permeable barrier made of a phospholipid bilayer. This structure is impermeable to ions and hydrophilic molecules, meaning that without specialised proteins, essential processes like nutrient uptake, waste removal, and signal transduction simply wouldn\u2019t happen.<\/li>\n\n\n\n<li>Membrane proteins mediate communication and control. These proteins enable the movement of solutes, water, and ions across the membrane and are central to how cells sense and respond to their environment.<\/li>\n\n\n\n<li>They are prime drug targets. Membrane proteins account for around two-thirds of all drug targets. G protein-coupled receptors (GPCRs) alone represent approximately 35% of approved drug targets, and about 12% of all protein targets with approved drugs are GPCRs1.<\/li>\n\n\n\n<li>They hold the key to understanding disease. Because they regulate so many critical cellular functions, membrane proteins are often implicated in diseases ranging from cancer and cardiovascular disorders to neurological conditions and infectious diseases.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading has-dark-blue-500-color has-text-color has-link-color has-text-2-xl-font-size wp-elements-780236b0facca1ef8355c6e93fcc35f0\">What do membrane proteins look like?<\/h3>\n\n\n\n<p>Membrane proteins come in a variety of structural forms, each adapted to their specific roles within the cell membrane. Broadly, they can be classified into several categories based on how they interact with the lipid bilayer:<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Peripheral (or membrane-associated) proteins<\/h4>\n\n\n\n<p>These proteins are not embedded in the membrane itself but are loosely attached to either the inner or outer surface. They often interact with integral membrane proteins or with the polar head groups of lipids.<\/p>\n\n\n\n<h4 class=\"wp-block-heading has-dark-blue-500-color has-text-color has-link-color has-text-lg-font-size wp-elements-038724ab2557822c0222af4b0df7a996\"><strong>Integral membrane proteins<\/strong><\/h4>\n\n\n\n<p>These span or are embedded within the membrane and can be further divided into two major structural classes:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Beta-barrel membrane proteins Found primarily in the outer membranes of bacteria, mitochondria, and chloroplasts, these proteins form cylindrical structures made of beta-sheets. They are less numerous in human cells but are important in certain transport and signalling functions.<\/li>\n\n\n\n<li>Alpha-helical membrane proteins. These are the most common type in eukaryotic cells and can be further divided into:\n<ul class=\"wp-block-list\">\n<li>Single-pass alpha-helical proteins, which cross the membrane once.<\/li>\n\n\n\n<li>Multi-pass alpha-helical proteins, which weave in and out of the membrane multiple times.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<p>Among these, multi-pass alpha-helical membrane proteins are particularly significant \u2014 and notoriously difficult to work with. They include some of the most pharmacologically important protein families, such as G protein-coupled receptors (GPCRs), ion channels, and transporters.<\/p>\n\n\n\n<p>These proteins are embedded within the membrane, making them challenging to express, purify, and stabilise outside of their native environment. Yet, because they play such central roles in cell signalling and homeostasis, they remain top priorities for drug discovery and structural biology.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full has-custom-border\" style=\"margin-top:var(--wp--preset--spacing--40);margin-bottom:var(--wp--preset--spacing--40)\"><img loading=\"lazy\" decoding=\"async\" width=\"1375\" height=\"988\" src=\"https:\/\/www.sygnaturediscovery.com\/wp-content\/uploads\/2025\/12\/Multi-pass-alpha-helical-membrane-proteins.webp\" alt=\"\" class=\"wp-image-5963\" style=\"border-radius:14px;object-fit:cover\" srcset=\"https:\/\/www.sygnaturediscovery.com\/wp-content\/uploads\/2025\/12\/Multi-pass-alpha-helical-membrane-proteins.webp 1375w, https:\/\/www.sygnaturediscovery.com\/wp-content\/uploads\/2025\/12\/Multi-pass-alpha-helical-membrane-proteins-300x216.webp 300w, https:\/\/www.sygnaturediscovery.com\/wp-content\/uploads\/2025\/12\/Multi-pass-alpha-helical-membrane-proteins-1024x736.webp 1024w, https:\/\/www.sygnaturediscovery.com\/wp-content\/uploads\/2025\/12\/Multi-pass-alpha-helical-membrane-proteins-768x552.webp 768w, https:\/\/www.sygnaturediscovery.com\/wp-content\/uploads\/2025\/12\/Multi-pass-alpha-helical-membrane-proteins-501x360.webp 501w, https:\/\/www.sygnaturediscovery.com\/wp-content\/uploads\/2025\/12\/Multi-pass-alpha-helical-membrane-proteins-640x460.webp 640w\" sizes=\"(max-width: 1375px) 100vw, 1375px\"><figcaption class=\"wp-element-caption\"><em><strong>Multi-pass alpha-helical proteins<\/strong>\u00a0\u2013 A snapshot of the membrane protein families that contain some of the most pharmacologically important targets, such as G protein-coupled receptors (GPCRs), ion channels, and transporters.<\/em><\/figcaption><\/figure>\n\n\n\n<h3 class=\"wp-block-heading has-dark-blue-500-color has-text-color has-link-color has-text-2-xl-font-size wp-elements-6f5fe6b6e6353c7790d006dadc55f830\">Why are membrane proteins so hard to work with?<\/h3>\n\n\n\n<p>Despite their biological importance and therapeutic potential, membrane proteins remain some of the most technically challenging targets in molecular biology and drug discovery.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Low expression yields.<\/strong>\u00a0Unlike soluble proteins, membrane proteins are often expressed at very low levels in both native and recombinant systems. Achieving sufficient quantities for structural or functional studies can be a major bottleneck.<\/li>\n\n\n\n<li><strong>Extraction from the membrane.<\/strong>\u00a0These proteins are embedded in the lipid bilayer, so they must be carefully solubilised using detergents or other membrane mimetics. The choice of solubilisation strategy can make or break downstream success.<\/li>\n\n\n\n<li><strong>Purification tag selection.<\/strong>\u00a0Affinity tags are commonly used to purify proteins, but for membrane proteins, tag placement and type can significantly affect folding, stability, and function.<\/li>\n\n\n\n<li><strong>Labile and unstable nature.<\/strong>\u00a0Human membrane proteins, in particular, are often fragile and prone to degradation or aggregation once removed from their native environment.<\/li>\n\n\n\n<li><strong>Unfolding or inactivation during purification.<\/strong>\u00a0Even if expression and solubilisation are successful, membrane proteins can lose their native conformation or activity during purification \u2014 especially if handled under non-physiological conditions.<\/li>\n\n\n\n<li><strong>Lack of generic quality control assays.<\/strong>\u00a0Assessing whether a membrane protein is properly folded and functional is not straightforward. Unlike soluble proteins, there are few universal assays, and many require custom development.<\/li>\n<\/ul>\n\n\n\n<p>These challenges underscore the need for specialised expertise, tools, and workflows \u2013 which is exactly what we aim to highlight in this blog series.<\/p>\n\n\n\n<h3 class=\"wp-block-heading has-dark-blue-500-color has-text-color has-link-color has-text-2-xl-font-size wp-elements-fb12da8d24c77e41f50510d8b121ac9c\">What happens after purification?<\/h3>\n\n\n\n<p>Purifying membrane proteins is a major milestone \u2014 but it\u2019s often just the beginning. Within the Protein Sciences department at Sygnature Discovery, we support a range of downstream applications, whether that means delivering high-quality reagents to our clients or carrying out further analysis in-house.<\/p>\n\n\n\n<h4 class=\"wp-block-heading has-dark-blue-500-color has-text-color has-link-color has-text-lg-font-size wp-elements-83981d95168ae1d3da59550012f9de12\"><strong>High-Quality Protein Reagents<\/strong><\/h4>\n\n\n\n<p>We routinely produce membrane proteins for delivery as research-grade reagents. These are suitable for a wide range of downstream applications, whether performed by your team or as part of a broader collaboration with us. Every batch is produced with a focus on yield, purity, and functional integrity.<\/p>\n\n\n\n<h4 class=\"wp-block-heading has-dark-blue-500-color has-text-color has-link-color has-text-lg-font-size wp-elements-70a02d981906077df5671b8a05315759\"><strong>In-House Expertise for Downstream Characterisation<\/strong><\/h4>\n\n\n\n<p>When required, we can take your membrane protein research to the next stage in-house and apply a suite of techniques to further characterise and validate membrane proteins. These include:<\/p>\n\n\n\n<p><strong>Biophysical Assays<\/strong><\/p>\n\n\n\n<p>To assess binding, stability, and function:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Surface Plasmon Resonance (SPR) \u2013 real-time binding kinetics<\/li>\n\n\n\n<li>Microscale Thermophoresis (MST) \u2013 interaction quantification in solution<\/li>\n\n\n\n<li>Thermal Shift Assays (TSA, CPM assay) \u2013 protein stability profiling<\/li>\n\n\n\n<li>Flow-Induced Dispersion Analysis (FIDA) \u2013 sizing and interaction studies<\/li>\n<\/ul>\n\n\n\n<p><strong>Structural Biology<\/strong><\/p>\n\n\n\n<p>To gain atomic-level insights into structure and mechanism:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Lipidic Cubic Phase (LCP) Crystallisation and X-ray Diffraction \u2013 for high-resolution structures<\/li>\n\n\n\n<li>Cryo-Electron Microscopy (Cryo-EM) \u2013 ideal for large, flexible, or complex membrane proteins<\/li>\n<\/ul>\n\n\n\n<p>These capabilities allow us to not only confirm the quality of the protein but also generate valuable insights into its mechanism, function, and drugability<\/p>\n\n\n\n<h3 class=\"wp-block-heading has-dark-blue-500-color has-text-color has-link-color has-text-2-xl-font-size wp-elements-da3673c02ebeda7daa61b47db347de09\">Conclusion<\/h3>\n\n\n\n<p>We hope this short article has given you a sense of why we\u2019re so passionate about membrane protein research \u2014 and why producing high-quality membrane protein tools is essential for advancing both basic science and drug discovery.<\/p>\n\n\n\n<h3 class=\"wp-block-heading has-dark-blue-500-color has-text-color has-link-color has-text-2-xl-font-size wp-elements-b8e16e17dea2cd5355db4e37bb235d56\">References<\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Sriram K, Insel PA. G Protein-Coupled Receptors as Targets for Approved Drugs: How Many Targets and How Many Drugs? doi: 10.1124\/mol.117.111062<\/li>\n<\/ol>\n","protected":false},"excerpt":{"rendered":"","protected":false},"featured_media":16917,"template":"","category":[973,1415,815],"class_list":["post-16915","blog","type-blog","status-publish","has-post-thumbnail","hentry","category-classes-cibles","category-membrane-proteins","category-proteines-et-structure"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Why Membrane Proteins Matter \u2013 and Why They\u2019re So Hard to Study! - Sygnature<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.sygnaturediscovery.com\/fr\/blog\/why-membrane-proteins-matter-and-why-theyre-so-hard-to-study\/\" \/>\n<meta property=\"og:locale\" content=\"fr_CA\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Why Membrane Proteins Matter \u2013 and Why They\u2019re So Hard to Study! 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