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Glycoprotein Ib

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From Wikipedia, the free encyclopedia

Protein found in platelets

Glycoprotein Ib (GPIb), also known as CD42,^[1]is a component of theGPIb-V-IX complex onplatelets. The GPIb-V-IX complex bindsvon Willebrand factor, allowingplatelet adhesion andplatelet plug formation at sites of vascular injury. Glycoprotein Ibα (GPIbα) is the major ligand-binding subunit of the GPIb-V-IX complex. GPIbα is heavily glycosylated.^[2]

It is deficient in theBernard–Soulier syndrome. Again-of-function mutation causes platelet-typevon Willebrand disease.^[3]

Autoantibodies against Ib/IX can be produced inimmune thrombocytopenic purpura.^[4]

Components includeGP1BA andGP1BB.

It complexes withGlycoprotein IX.

References

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^Bode AP, Read MS, Reddick RL (February 1999). "Activation and adherence of lyophilized human platelets on canine vessel strips in the Baumgartner perfusion chamber".The Journal of Laboratory and Clinical Medicine.133 (2):200–211.doi:10.1016/S0022-2143(99)90013-6.PMID 9989772.
^Hollenhorst MA, Tiemeyer KH, Mahoney KE, Aoki K, Ishihara M, Lowery SC, et al. (April 2023)."Comprehensive analysis of platelet glycoprotein Ibα ectodomain glycosylation".Journal of Thrombosis and Haemostasis.21 (4):995–1009.doi:10.1016/j.jtha.2023.01.009.PMC 10065957.PMID 36740532.
^McPherson RA, Pincus MR (2007).Henry's Clinical Diagnosis and Management by Laboratory Methods (21st ed.). Philadelphia, Pa: Saunders Elsevier. pp. 760–762.ISBN 978-1-4160-0287-1.
^McMillan R (October 2007). "The pathogenesis of chronic immune thrombocytopenic purpura".Seminars in Hematology.44 (4 Suppl 5):S3 –S11.doi:10.1053/j.seminhematol.2007.11.002.PMID 18096470.

External links

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Glycoprotein+Ib at the U.S. National Library of MedicineMedical Subject Headings (MeSH)

Coagulation cascade

Coagulation factors

Primary hemostasis (platelet activation)	von Willebrand factor (vWF) Platelet membrane glycoproteins:Glycoprotein Ib (GPIb) (GP1BA GP1BB Glycoprotein IX (GP9)) Glycoprotein IIb/IIIa (GPIIb GPIIIa) Glycoprotein VI (GPVI)
Intrinsic pathway (contact activation)	High-molecular-weight kininogen (HMWK) Bradykinin Prekallikrein Kallikrein Factor XII (Hageman factor) Factor XI Factor IX Factor VIII
Extrinsic pathway (tissue factor)	Factor III (tissue factor) Factor VII
Common pathway	Factor X Factor V Prothrombin (factor II) Thrombin (factor IIa) Fibrinogen (factor I) (FGA,FGG) Fibrin (factor Ia) Factor XIII

Anticoagulant factors

Fibrinolytic factors

Coagulation markers

Platelet activation	Platelet factor 4 (PF4) β-Thromboglobulin (β-TG)
Thrombin generation	Prothrombin fragment 1+2 (F1+2) Thrombin–antithrombin complex (TAT) Activated protein C–protein C inhibitor (APC–PCI)
Fibrin generation	Fibrinopeptide A (FpA) Fibrinopeptide B (FpB) Fibrin monomers (FM)
Fibrinolysis	Plasmin-α₂-antiplasmin complex (PAP) D-Dimer (DD)

v t e Proteins:clusters of differentiation (see alsolist of human clusters of differentiation)
1–50	CD1 a-c 1A 1B 1D 1E CD2 CD3 γ δ ε CD4 CD5 CD6 CD7 CD8 a CD9 CD10 CD11 a b c d CD13 CD14 CD15 CD16 A B CD18 CD19 CD20 CD21 CD22 CD23 CD24 CD25 CD26 CD27 CD28 CD29 CD30 CD31 CD32 A B CD33 CD34 CD35 CD36 CD37 CD38 CD39 CD40 CD41 CD42 a b c d CD43 CD44 CD45 CD46 CD47 CD48 CD49 a b c d e f CD50
51–100	CD51 CD52 CD53 CD54 CD55 CD56 CD57 CD58 CD59 CD61 CD62 E L P CD63 CD64 A B C CD66 a b c d e f CD68 CD69 CD70 CD71 CD72 CD73 CD74 CD78 CD79 a b CD80 CD81 CD82 CD83 CD84 CD85 a d e h j k CD86 CD87 CD88 CD89 CD90 CD91 -CD92 CD93 CD94 CD95 CD96 CD97 CD98 CD99 CD100
101–150	CD101 CD102 CD103 CD104 CD105 CD106 CD107 a b CD108 CD109 CD110 CD111 CD112 CD113 CD114 CD115 CD116 CD117 CD118 CD119 CD120 a b CD121 a b CD122 CD123 CD124 CD125 CD126 CD127 CD129 CD130 CD131 CD132 CD133 CD134 CD135 CD136 CD137 CD138 CD140b CD141 CD142 CD143 CD144 CD146 CD147 CD148 CD150
151–200	CD151 CD152 CD153 CD154 CD155 CD156 a b c CD157 CD158 (a d e i k) CD159 a c CD160 CD161 CD162 CD163 CD164 CD166 CD167 a b CD168 CD169 CD170 CD171 CD172 a b g CD174 CD177 CD178 CD179 a b CD180 CD181 CD182 CD183 CD184 CD185 CD186 CD191 CD192 CD193 CD194 CD195 CD196 CD197 CDw198 CDw199 CD200
201–250	CD201 CD202b CD204 CD205 CD206 CD207 CD208 CD209 CDw210 a b CD212 CD213a 1 2 CD217 CD218 (a b) CD220 CD221 CD222 CD223 CD224 CD225 CD226 CD227 CD228 CD229 CD230 CD233 CD234 CD235 a b CD236 CD238 CD239 CD240CE CD240D CD241 CD243 CD244 CD246 CD247 -CD248 CD249
251–300	CD252 CD253 CD254 CD256 CD257 CD258 CD261 CD262 CD263 CD264 CD265 CD266 CD267 CD268 CD269 CD271 CD272 CD273 CD274 CD275 CD276 CD278 CD279 CD280 CD281 CD282 CD283 CD284 CD286 CD288 CD289 CD290 CD292 CDw293 CD294 CD295 CD297 CD298 CD299
301–350	CD300A CD301 CD302 CD303 CD304 CD305 CD306 CD307 CD309 CD312 CD314 CD315 CD316 CD317 CD318 CD320 CD321 CD322 CD324 CD325 CD326 CD327 CD328 CD329 CD331 CD332 CD333 CD334 CD335 CD336 CD337 CD338 CD339 CD340 CD344 CD349 CD350

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