Creative Biolabs is offering the most comprehensive services for antibody development projects. With strict regulation and effective execution, we are dedicated to providing the most valuable solutions to complete your projects.
HighlightsCreative Biolabs is offering the most comprehensive services for antibody development projects. With strict regulation and effective execution, we are dedicated to providing the most valuable solutions to complete your projects.
HighlightsCreative Biolabs has established a broad range of platforms for developing novel antibodies or equivalents. These cutting-edge technologies enable our scientists to meet your demands from different aspects and tailor the most appropriate solution that contributes to the success of your projects.
HighlightsWith deep understanding in antibody-related realms and extensive project experience, Creative Biolabs offers a variety of references to help you learn more about our capacities and achievements, including infographic, flyer, case study, peer-reviewed publications, and all kinds of knowledge that can assist your projects. You are also welcome to contact us directly for more specific solutions.
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Crumbs cell polar complex component 1(CRB1) is a highly conserved apical single transmembrane scaffold protein encoded by CRB1 gene, which is mainly located in the apical cell membranes of retinal photoreceptor cells and Müller glial cells, and only slightly expressed in the central nervous system. Compared with homologous protein CRB2 and short domain subtype CRB3, CRB1 has a large extracellular domain rich in EGF and laminin globular motifs, and has an intracellular tail structure with PDZ and FERM binding sites, which is the core assembly element of retinal Crumbs polar complex and can stabilize the intercellular junction structure of retinal outer membrane. Under the conditions of retinal development and physiological steady state, CRB1 is continuously and stably expressed, maintaining the standard top-base polar arrangement of photoreceptor cells, stabilizing the intercellular adhesion structure, and effectively avoiding the disorder of retinal layered structure. When the mutation of double allele loss occurs in CRB1, the polar complex assembly system mediated by CRB1 collapses, resulting in disorder of photoreceptor cells and progressive degeneration of retinal pigment, and inducing severe visual impairment diseases such as Lieber's congenital amaurosis and retinitis pigmentosa. Other CRB homologous proteins can't compensate CRB1' unique retinal polarity maintenance function, and CRB1 deletion will completely disrupt the morphogenesis of photoreceptor cells, while the pathogenic mutant CRB1 can't assemble functional polar complexes, making it the core irreplaceable target of retinal epithelial polarity biology and drug screening for hereditary blindness diseases.
CRB1 is anchored on the lipid bilayer of photoreceptor cells and glial cell membranes, and plays the role of top polar scaffold regulation. It mediates homologous interaction of CRB1 and heterologous interaction of CRB1-CRB2 through multi-domain extracellular functional regions. At the same time, it uses intracellular functional motifs to recruit PDZ polar adaptor proteins to assemble stable intercellular junction devices. Its unique extra-long extracellular structure forms obvious functional differentiation with CRB3 lacking ligand binding region, which endows it with exclusive retinal tissue protection function. The polar complex assembly pathway mediated by CRB1 connects the differentiation of embryonic retinal progenitor cells with the structural stability of adult photoreceptor cells, which can dynamically maintain the integrity of retinal layered structure according to the development process and lighting environment. The protein is involved in the maturation and differentiation of photoreceptor cells, the construction of retinal outer membrane and the maintenance of retinal tissue structure for life. The defect of CRB1 expression or function will completely destroy the complete structure of retinal epithelium and trigger the progressive apoptosis of photoreceptor cells. To sum up, CRB1 is the key target for studying the mechanism of ocular polar proteins and developing drugs for hereditary retinopathy.
Fig. 1 Composite schematic: (A) Domain topology comparison of human CRB family isoforms; (B) Conserved apical subcellular localization of CRB1/CRB2 across multiple vertebrate retinal models; (C) Intracellular Rab11-dependent trafficking cycle controlling CRB apical membrane targeting.1
The biological functions of CRB1 are focused on Crumbs complex assembly and retinal tissue stabilization:
Creative Biolabs offers high-quality CRB1 proteins through optimized eukaryotic expression systems, including full-length canonical CRB1-A isoform and isolated extracellular/intracellular domain variants. These products retain native CRB complex homodimerization and PDZ adaptor binding activity, suitable for retinal polarity interaction and hereditary eye disease inhibitor screening assays. All CRB1 proteins undergo strict quality control to ensure consistent performance and reliable application across ocular research platforms.
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Creative Biolabs provides custom-engineered CRB1 stable cell lines, including wild-type and pathogenic mutant overexpression blank control models. These cell lines are optimized for retinal polarity scaffold profiling and photoreceptor survival signal functional analysis. Each cell line undergoes stringent validation to ensure stable expression profiles during long-term cell culture and retinal organoid construction experiments.
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High-specificity recombinant antibodies targeting CRB1 are developed via advanced antibody engineering technologies, with no cross-reactivity with CRB2/CRB3 paralog proteins. These antibodies are validated for photoreceptor and Müller glial apical membrane immunostaining, and can be combined with retinal junction marker reagents to analyze intact Crumbs polarity complexes in retinal organoid models.
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Beyond catalog products, Creative Biolabs offers specialized custom services for CRB1 research:
CRB1 is an apical transmembrane scaffold that assembles retinal Crumbs polarity complexes to stabilize photoreceptor junctions and maintain retinal structural integrity.
Pathogenic CRB1 gene variants are the major genetic cause of Leber congenital amaurosis and early-onset retinitis pigmentosa, key target for ocular gene therapy research.
No, all CRB1 proteins, antibodies and cell lines are strictly for laboratory basic research only, not intended for clinical ophthalmic diagnosis or human treatment trials.
Offerings include full-length CRB1 isoform proteins, isoform-specific detection antibodies and custom stable cell lines for retinal developmental research.
CRB1 proteins are validated via CRB1-CRB2 heterodimerization and PDZ adaptor co-binding functional testing.
