{"id":1028,"date":"2025-12-17T23:26:42","date_gmt":"2025-12-17T23:26:42","guid":{"rendered":"http:\/\/eurosoi.org\/?p=1028"},"modified":"2025-12-17T23:26:42","modified_gmt":"2025-12-17T23:26:42","slug":"overall-these-results-showed-that-gpib-ix-retains-its-normal-ligand-binding-function-when-reconstituted-in-nanodiscs","status":"publish","type":"post","link":"https:\/\/eurosoi.org\/?p=1028","title":{"rendered":"\ufeffOverall, these results showed that GPIb-IX retains its normal ligand-binding function when reconstituted in Nanodiscs"},"content":{"rendered":"<p>\ufeffOverall, these results showed that GPIb-IX retains its normal ligand-binding function when reconstituted in Nanodiscs. == Figure 4. In conclusion, GPIb-IX in Nanodiscs adopts native-like conformation and possesses the ability to bind its natural <a href=\"https:\/\/www.adooq.com\/imr-1.html\">IMR-1<\/a> ligands, thus making Nanodisc a suitablein vitroplatform <a href=\"http:\/\/www.digitalhistory.uh.edu\/database\/article_display.cfm?HHID=517\">Rabbit Polyclonal to SPINK6<\/a> for further investigation on this hemostatically important receptor complex. == INTRODUCTION == Cell adhesion receptors not only mediate cell-matrix interactions and cell-cell contacts through ligand binding of their extracellular domains, but also transmit signals into the cell to initiate response to the change in its surroundings. The activity of many adhesion receptors can be regulated by intracellular signals via an apparent inside-out pathway. While the molecular mechanisms underlying the outside-in and inside-out signaling pathways have been the target of numerous studies, most of which are concentrated on the platelet-specific integrin IIb3 (13), general principles for the adhesion receptor-mediated transmembrane signaling remain to be elucidated. The glycoprotein (GP) Ib-IX complex is expressed in the plasma membrane of platelets and plays a critical role in the initiation of thrombosis and hemostasis. This adhesion receptor complex consists of three type I transmembrane protein subunits, GPIb, GPIb and GPIX, with a stoichiometry of 1 1:2:1 (4,5). GPIb connects with two GPIb subunits through membrane-proximal disulfide bonds to form a complex called GPIb (5). GPIX is tightly associated with GPIb through noncovalent forces in both extracellular and transmembrane domains (4,68). In the GPIb-IX complex, the N-terminal leucine-rich repeat domain of GPIb contains the binding site for its physiological ligand VWF (911). Upon ligation with the A1 domain of VWF, the GPIb-IX complex transmits inward, through the cytoplasmic tail of GPIb, an activating signal that leads to activation of integrin IIb3 and eventual platelet aggregation (12,13). A recent study shows that although mouse platelets expressing a PT-VWD mutation in the N-terminal ligand-binding domain of GPIb spontaneously binds to VWF as expected, the platelets were surprisingly inactive and failed to respond to agonist treatment, suggesting that the mutant GPIb-IX complex transmits an inhibitory signal into the platelet (14). In addition to mediating outside-in signaling events, GPIb-IX complex undergoes inside-out regulation. For instance, a change in the phosphorylation state of Ser166 in the cytoplasmic domain of GPIb can influence VWF binding to the N-terminal domain of GPIb (15,16). Moreover, a 27-bp IMR-1 deletion in the macroglycopeptide-coding region of the GPIBA gene has been identified in certain PT-VWD patients (17). The deletion, distal to the ligand-binding domain but proximal to the transmembrane domain of GPIb, increased the VWF binding function of GPIb that are heterologously expressed in mammalian cells (17). However, our understanding of the mechanism by which the GPIb-IX complex transmits signals in both directions remains limited, partly due to the difficulty in the characterization of multi-subunit membrane protein complexes as well as the lack of a suitablein vitroexperimental system for this complex. Phospholipid bilayer Nanodiscs are novel model membranes derived from nascent discoidal high-density lipoprotein particles (18,19). One disc contains a patch of phospholipid, which is wrapped by two copies of membrane scaffold protein (MSP) derived from human apolipoprotein A-I (19). Due to the presence of the protein coat MSP, Nanodiscs are soluble and monodisperse and have well-defined diameters, ranging from 9.4 nm to 12 nm depending on the size of MSP (19,20). Therefore, the membrane proteins placed into the Nanodisc have the native-like membrane IMR-1 environment. The exposure of both extracellular and intracellular domains of a membrane protein to the same aqueous environment is particularly amenable to spectroscopic investigations. Indeed Nanodiscs have been adopted in studies of a variety of membrane proteins, including bacteriorhodopsin and G protein-coupled receptors (2123), bacterial chemoreceptors (24), epidermal growth factor receptor (EGFR) (25) and integrin IIb3 (26)..<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\ufeffOverall, these results showed that GPIb-IX retains its normal ligand-binding function when reconstituted in Nanodiscs. == Figure 4. In conclusion, GPIb-IX in Nanodiscs adopts native-like conformation and possesses the ability to bind its natural IMR-1 ligands, thus making Nanodisc a suitablein vitroplatform Rabbit Polyclonal to SPINK6 for further investigation on <a href=\"https:\/\/eurosoi.org\/?p=1028\" class=\"btn btn-link continue-link\">Continue Reading<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[10],"tags":[],"class_list":["post-1028","post","type-post","status-publish","format-standard","hentry","category-leptin-receptors"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>\ufeffOverall, these results showed that GPIb-IX retains its normal ligand-binding function when reconstituted in Nanodiscs - JAK2 inhibitor against human prostate cancer cells<\/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:\/\/eurosoi.org\/?p=1028\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\ufeffOverall, these results showed that GPIb-IX retains its normal ligand-binding function when reconstituted in Nanodiscs - JAK2 inhibitor against human prostate cancer cells\" \/>\n<meta property=\"og:description\" content=\"\ufeffOverall, these results showed that GPIb-IX retains its normal ligand-binding function when reconstituted in Nanodiscs. == Figure 4. 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