Recombinant Human IMPG1 protein (His-DHFR tag N-Terminus)

Supplementary information

This supplementary information is collated from multiple sources and compiled automatically.

IMPG1 also known as Interphotoreceptor Matrix Proteoglycan 1 or SPACR (Sialoprotein Associated with Cones and Rods) is a protein with a mass of about 133 kDa. It plays a mechanical role in the structure and function of the interphotoreceptor matrix (IPM) in the eye. IMPG1 locates between the photoreceptor cells and the retinal pigment epithelium and its expression is highly specific to retinal tissues. This protein contributes to maintaining the extracellular environment important for ocular photoreceptors.

Biological function summary

IMPG1 supports the stability and integrity of the IPM serving as a structural component and interacting with various molecules within the matrix. It contributes to the arrangement of photoreceptor outer segments facilitating their proper function. IMPG1 forms a complex with other glycoproteins in the IPM providing a scaffold for adhesion molecules and playing a significant role in visual cycles. Its interactions with retinal pigment epithelial cells influence photoreceptor health and homeostasis.

Pathways

IMPG1 participates prominently in the visual cycle and phototransduction pathway. In these pathways the protein ensures effective communication and nutrient exchange between photoreceptors and retinal pigment epithelial cells. Notably IMPG1 interacts with peripherin-2 a protein essential for disc morphogenesis in photoreceptors. This relationship enhances the structural cohesion needed for efficient phototransduction and maintenance of vision.

IMPG1 associates strongly with retinitis pigmentosa and macular degeneration. These conditions often involve mutations or malfunctions in this protein leading to progressive vision loss. IMPG1 relationships with proteins like peripherin-2 are critical in understanding such diseases as disruptions can impair the protective and structural roles of the interphotoreceptor matrix. Studying these connections aids in developing potential therapeutic strategies for degenerative retinal disorders.