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LAMP1 and LAMP2 glycoproteins comprise 50% of all lysosomal membrane proteins, [6] and are thought to be responsible in part for maintaining lysosomal integrity, pH and catabolism. [6] [11] The expression of LAMP1 and LAMP2 glycoproteins are linked, as deficiencies in LAMP1 gene will lead to increased expression of LAMP2 glycoproteins. [11] The two are therefore thought to share similar functions in vivo. [6] However, this makes the determining the precise function of LAMP1 difficult, because while the LAMP1 deficient phenotype is little different than the wild type due to LAMP2 up regulation, [6] [11] the LAMP1/ LAMP2 double deficient phenotype leads to embryonic lethality. [11] Raposo G, Moore M, Innes D, Leijendekker R, Leigh-Brown A, Benaroch P, Geuze H (Oct 2002). "Human macrophages accumulate HIV-1 particles in MHC II compartments". Traffic. 3 (10): 718–29. doi: 10.1034/j.1600-0854.2002.31004.x. PMID 12230470. S2CID 7055266. Zhang H, Li XJ, Martin DB, Aebersold R (Jun 2003). "Identification and quantification of N-linked glycoproteins using hydrazide chemistry, stable isotope labeling and mass spectrometry". Nature Biotechnology. 21 (6): 660–6. doi: 10.1038/nbt827. PMID 12754519. S2CID 581283.Carlsson SR, Fukuda M (Dec 1989). "Structure of human lysosomal membrane glycoprotein 1. Assignment of disulfide bonds and visualization of its domain arrangement". The Journal of Biological Chemistry. 264 (34): 20526–31. doi: 10.1016/S0021-9258(19)47094-4. PMID 2584229. Ohno H, Stewart J, Fournier MC, Bosshart H, Rhee I, Miyatake S, Saito T, Gallusser A, Kirchhausen T, Bonifacino JS (Sep 1995). "Interaction of tyrosine-based sorting signals with clathrin-associated proteins". Science. 269 (5232): 1872–5. Bibcode: 1995Sci...269.1872O. doi: 10.1126/science.7569928. PMID 7569928. a b c d e Carlsson SR, Fukuda M (Dec 1989). "Structure of human lysosomal membrane glycoprotein 1. Assignment of disulfide bonds and visualization of its domain arrangement". The Journal of Biological Chemistry. 264 (34): 20526–31. doi: 10.1016/S0021-9258(19)47094-4. PMID 2584229.

Fukuda M, Viitala J, Matteson J, Carlsson SR (Dec 1988). "Cloning of cDNAs encoding human lysosomal membrane glycoproteins, h-lamp-1 and h-lamp-2. Comparison of their deduced amino acid sequences". The Journal of Biological Chemistry. 263 (35): 18920–8. doi: 10.1016/S0021-9258(18)37370-8. PMID 3198605. poly-N-acetyllactosamine groups which are involved in interactions with selectin and other glycan-binding proteins [11] Lee N, Wang WC, Fukuda M (Nov 1990). "Granulocytic differentiation of HL-60 cells is associated with increase of poly-N-acetyllactosamine in Asn-linked oligosaccharides attached to human lysosomal membrane glycoproteins". The Journal of Biological Chemistry. 265 (33): 20476–87. doi: 10.1016/S0021-9258(17)30529-X. PMID 2243101.

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Kima, P. E.; Burleigh, B.; Andrews, N. W. (Dec 2000). "Surface-targeted lysosomal membrane glycoprotein-1 (Lamp-1) enhances lysosome exocytosis and cell invasion by Trypanosoma cruzi". Cellular Microbiology. 2 (6): 477–486. doi: 10.1046/j.1462-5822.2000.00071.x. ISSN 1462-5814. PMID 11207602. S2CID 19192092. Mane SM, Marzella L, Bainton DF, Holt VK, Cha Y, Hildreth JE, August JT (Jan 1989). "Purification and characterization of human lysosomal membrane glycoproteins". Archives of Biochemistry and Biophysics. 268 (1): 360–78. doi: 10.1016/0003-9861(89)90597-3. PMID 2912382. Furuta K, Yang XL, Chen JS, Hamilton SR, August JT (May 1999). "Differential expression of the lysosome-associated membrane proteins in normal human tissues". Archives of Biochemistry and Biophysics. 365 (1): 75–82. doi: 10.1006/abbi.1999.1147. PMID 10222041. Laferte S, Dennis JW (Apr 1989). "Purification of two glycoproteins expressing beta 1-6 branched Asn-linked oligosaccharides from metastatic tumour cells". The Biochemical Journal. 259 (2): 569–576. doi: 10.1042/bj2590569. PMC 1138546. PMID 2719668. a b c d e f Eskelinen EL (2006). "Roles of LAMP-1 and LAMP-2 in lysosome biogenesis and autophagy". Molecular Aspects of Medicine. 27 (5–6): 495–502. doi: 10.1016/j.mam.2006.08.005. PMID 16973206.

Lysosomal-associated membrane protein 1 is a glycoprotein from a family of Lysosome-associated membrane glycoproteins. [5] The LAMP-1 glycoprotein is a type I transmembrane protein [6] which is expressed at high or medium levels in at least 76 different normal tissue cell types. [7] It resides primarily across l ysosomal membranes, [8] and functions to provide selectins with carbohydrate ligands. [5] CD107a has also been shown to be a marker of degranulation on lymphocytes such as CD8+ and NK cells, [9] and may also play a role in tumor cell differentiation and metastasis. Rohrer J, Schweizer A, Russell D, Kornfeld S (Feb 1996). "The targeting of Lamp1 to lysosomes is dependent on the spacing of its cytoplasmic tail tyrosine sorting motif relative to the membrane". The Journal of Cell Biology. 132 (4): 565–76. doi: 10.1083/jcb.132.4.565. PMC 2199866. PMID 8647888. a b Künzli BM, Berberat PO, Zhu ZW, Martignoni M, Kleeff J, Tempia-Caliera AA, Fukuda M, Zimmermann A, Friess H, Büchler MW (Jan 2002). "Influences of the lysosomal associated membrane proteins (Lamp-1, Lamp-2) and Mac-2 binding protein (Mac-2-BP) on the prognosis of pancreatic carcinoma". Cancer. 94 (1): 228–239. doi: 10.1002/cncr.10162. PMID 11815981. S2CID 12702437. Howe CL, Granger BL, Hull M, Green SA, Gabel CA, Helenius A, Mellman I (Oct 1988). "Derived protein sequence, oligosaccharides, and membrane insertion of the 120-kDa lysosomal membrane glycoprotein (lgp120): identification of a highly conserved family of lysosomal membrane glycoproteins". Proceedings of the National Academy of Sciences of the United States of America. 85 (20): 7577–81. Bibcode: 1988PNAS...85.7577H. doi: 10.1073/pnas.85.20.7577. PMC 282235. PMID 3174652. Mouse PubMed Reference:". National Center for Biotechnology Information, U.S. National Library of Medicine.

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Residing primarily across lysosomal membranes, these glycoproteins consist of a large, highly glycosylated end with N-linked carbon chains on the luminal side of the membrane, and a short C-terminal tail [6] exposed to the cytoplasm. [8] The extracytoplasmic region contains a hinge-like structure which can form disulphide bridges homologous to those observed in human immunoglobulin A. [8] Other characteristics of the structure of the LAMP-1 glycoproteins include: Significant quantities of polylactosaminoglycan and sialic acid to traverse the trans- Golgi cisternae. [10]