Histidine-rich glycoprotein (HRG) is a glycoprotein that in humans is encoded by the HRGgene.[1][2] The HRG protein is produced in the liver, and it could also be synthesized by monocytes, macrophages, and megakaryocytes.[3] It possesses a multi-domain structure, which makes it capable of binding to numerous ligands and modulating various biological processes including immunity, vascularization and coagulation.[4]
The HRG gene lies on location of 3q27 on the chromosome 3, spans approximately 11kb, and consist of 7 exons. Two common isoforms of the HRG gene have been found in humans. These isoforms exist due to a polymorphism occurring in exon 5.[5]
Protein
HRG is a glycoprotein of 70-75kDa present at a relatively high concentration in the plasma of vertebrates. The primary structure of human HRG is predicted to be a 507 amino acid multidomain polypeptide consisting of two cystatin-like regions at the N-terminus, a histidine-rich region (HRR) flanked by proline-rich regions (PRR), and a C-terminal domain.[6] HRG has an unusually high concentration of histidine and proline residues, each constituting approximately 13% of total amino acids, concentrated within the HRR and PRR.[7][8][9] The high concentration of both histidine and proline residues has resulted in HRG also being termed 'histidine–proline-rich glycoprotein' (HPRG).[10] Human HRG is also composed of approximately 14% carbohydrate attached to six predicted N-linked glycosylation sites.[6]
The implications of HRG in cancer have been described as "multi-faceted".[14] For example, the protein appears to have both pro- and anti-angiogenic effects. In biomarker studies, the protein has been found to have potential prognostic and diagnostic value for cancer.[14] Furthermore, the absence of the protein is associated with thrombophilia.[14] HRG has also been shown to inhibit the M2-like phenotype of tumor-associated macrophages.[15]
In addition, HRG has been discovered to play a role in infection. Some studies have found HRG has the antibacterial activity against Streptococcus pyogenes and a direct interaction between a S. pyogenes virulence factor (sHIP) and the human HRG has been identified.[14][16]
↑Wakabayashi S (2013). "New insights into the functions of histidine-rich glycoprotein". International Review of Cell and Molecular Biology. 304: 467–93. doi:10.1016/B978-0-12-407696-9.00009-9. PMID23809442.
↑ 4.04.1Blank M, Shoenfeld Y (June 2008). "Histidine-rich glycoprotein modulation of immune/autoimmune, vascular, and coagulation systems". Clinical Reviews in Allergy & Immunology. 34 (3): 307–12. doi:10.1007/s12016-007-8058-6. PMID18219588.
↑Hennis BC, van Boheemen PA, Wakabayashi S, Koide T, Hoffmann JJ, Kievit P, Dooijewaard G, Jansen JG, Kluft C (December 1995). "Identification and genetic analysis of a common molecular variant of histidine-rich glycoprotein with a difference of 2kD in apparent molecular weight". Thrombosis and Haemostasis. 74 (6): 1491–6. PMID8772226.
↑ 6.06.1Koide T, Foster D, Yoshitake S, Davie EW (April 1986). "Amino acid sequence of human histidine-rich glycoprotein derived from the nucleotide sequence of its cDNA". Biochemistry. 25 (8): 2220–5. doi:10.1021/bi00356a055. PMID3011081.
↑Haupt H, Heimburger N (July 1972). "[Human serum proteins with high affinity for carboxymethylcellulose. I. Isolation of lysozyme, C1q and 2 hitherto unknown -globulins]". Hoppe-Seyler's Zeitschrift für Physiologische Chemie. 353 (7): 1125–32. PMID4116336.
↑Lijnen HR, Hoylaerts M, Collen D (November 1980). "Isolation and characterization of a human plasma protein with affinity for the lysine binding sites in plasminogen. Role in the regulation of fibrinolysis and identification as histidine-rich glycoprotein". The Journal of Biological Chemistry. 255 (21): 10214–22. PMID6448849.
↑Koide T, Odani S, Ono T (November 1985). "Human histidine-rich glycoprotein: simultaneous purification with antithrombin III and characterization of its gross structure". Journal of Biochemistry. 98 (5): 1191–200. PMID4086476.
↑Borza DB, Tatum FM, Morgan WT (February 1996). "Domain structure and conformation of histidine-proline-rich glycoprotein". Biochemistry. 35 (6): 1925–34. doi:10.1021/bi952061t. PMID8639676.
↑Poon IK, Patel KK, Davis DS, Parish CR, Hulett MD (February 2011). "Histidine-rich glycoprotein: the Swiss Army knife of mammalian plasma". Blood. 117 (7): 2093–101. doi:10.1182/blood-2010-09-303842. PMID20971949.
↑Jones AL, Hulett MD, Parish CR (April 2005). "Histidine-rich glycoprotein: A novel adaptor protein in plasma that modulates the immune, vascular and coagulation systems". Immunology and Cell Biology. 83 (2): 106–18. doi:10.1111/j.1440-1711.2005.01320.x. PMID15748207.
↑ 14.014.114.214.3Johnson LD, Goubran HA, Kotb RR (February 2014). "Histidine rich glycoprotein and cancer: a multi-faceted relationship". Anticancer Research. 34 (2): 593–603. PMID24510988.
↑Rolny C, Mazzone M, Tugues S, Laoui D, Johansson I, Coulon C, Squadrito ML, Segura I, Li X, Knevels E, Costa S, Vinckier S, Dresselaer T, Åkerud P, De Mol M, Salomäki H, Phillipson M, Wyns S, Larsson E, Buysschaert I, Botling J, Himmelreich U, Van Ginderachter JA, De Palma M, Dewerchin M, Claesson-Welsh L, Carmeliet P (January 2011). "HRG inhibits tumor growth and metastasis by inducing macrophage polarization and vessel normalization through downregulation of PlGF". Cancer Cell. 19 (1): 31–44. doi:10.1016/j.ccr.2010.11.009. PMID21215706.
↑ 18.018.1Morgan WT (August 1978). "Human serum histidine-rich glycoprotein. I. Interactions with heme, metal ions and organic ligands". Biochimica et Biophysica Acta. 535 (2): 319–33. doi:10.1016/0005-2795(78)90098-3. PMID678554.
↑Morgan WT (March 1981). "Interactions of the histidine-rich glycoprotein of serum with metals". Biochemistry. 20 (5): 1054–61. doi:10.1021/bi00508a002. PMID7225317.
↑Jones AL, Hulett MD, Parish CR (July 2004). "Histidine-rich glycoprotein binds to cell-surface heparan sulfate via its N-terminal domain following Zn2+ chelation". The Journal of Biological Chemistry. 279 (29): 30114–22. doi:10.1074/jbc.M401996200. PMID15138272.
↑Jones AL, Hulett MD, Altin JG, Hogg P, Parish CR (September 2004). "Plasminogen is tethered with high affinity to the cell surface by the plasma protein, histidine-rich glycoprotein". The Journal of Biological Chemistry. 279 (37): 38267–76. doi:10.1074/jbc.M406027200. PMID15220341.
↑Gorgani NN, Parish CR, Altin JG (October 1999). "Differential binding of histidine-rich glycoprotein (HRG) to human IgG subclasses and IgG molecules containing kappa and lambda light chains". The Journal of Biological Chemistry. 274 (42): 29633–40. doi:10.1074/jbc.274.42.29633. PMID10514432.
Further reading
Hughes GJ, Frutiger S, Paquet N, Ravier F, Pasquali C, Sanchez JC, James R, Tissot JD, Bjellqvist B, Hochstrasser DF (1993). "Plasma protein map: an update by microsequencing". Electrophoresis. 13 (9–10): 707–14. doi:10.1002/elps.11501301150. PMID1459097.
Hutchens TW, Yip TT, Morgan WT (March 1992). "Identification of histidine-rich glycoprotein in human colostrum and milk". Pediatric Research. 31 (3): 239–46. doi:10.1203/00006450-199203000-00009. PMID1561009.
van den Berg EA, le Clercq E, Kluft C, Koide T, van der Zee A, Oldenburg M, Wijnen JT, Meera Khan P (June 1990). "Assignment of the human gene for histidine-rich glycoprotein to chromosome 3". Genomics. 7 (2): 276–9. doi:10.1016/0888-7543(90)90551-5. PMID2347592.
Shatsky M, Saigo K, Burdach S, Leung LL, Levitt LJ (May 1989). "Histidine-rich glycoprotein blocks T cell rosette formation and modulates both T cell activation and immunoregulation". The Journal of Biological Chemistry. 264 (14): 8254–9. PMID2524479.
Saigo K, Shatsky M, Levitt LJ, Leung LK (May 1989). "Interaction of histidine-rich glycoprotein with human T lymphocytes". The Journal of Biological Chemistry. 264 (14): 8249–53. PMID2566603.
Koide T, Foster D, Yoshitake S, Davie EW (April 1986). "Amino acid sequence of human histidine-rich glycoprotein derived from the nucleotide sequence of its cDNA". Biochemistry. 25 (8): 2220–5. doi:10.1021/bi00356a055. PMID3011081.
Heimburger N, Haupt H, Kranz T, Baudner S (July 1972). "[Human serum proteins with high affinity to carboxymethylcellulose. II. Physico-chemical and immunological characterization of a histidine-rich 3,8S- 2 -glycoportein (CM-protein I)]". Hoppe-Seyler's Zeitschrift für Physiologische Chemie. 353 (7): 1133–40. PMID4116337.
Hennis BC, Frants RR, Bakker E, Vossen RH, van der Poort EW, Blonden LA, Cox S, Khan PM, Spurr NK, Kluft C (January 1994). "Evidence for the absence of intron H of the histidine-rich glycoprotein (HRG) gene: genetic mapping and in situ localization of HRG to chromosome 3q28-q29". Genomics. 19 (1): 195–7. doi:10.1006/geno.1994.1046. PMID8188234.
Sørensen CB, Krogh-Pedersen H, Petersen TE (August 1993). "Determination of the disulphide bridge arrangement of bovine histidine-rich glycoprotein". FEBS Letters. 328 (3): 285–90. doi:10.1016/0014-5793(93)80945-Q. PMID8348977.
Leung L (May 1993). "Histidine-rich glycoprotein: an abundant plasma protein in search of a function". The Journal of Laboratory and Clinical Medicine. 121 (5): 630–1. PMID8478589.
Angles-Cano E, Gris JC, Loyau S, Schved JF (May 1993). "Familial association of high levels of histidine-rich glycoprotein and plasminogen activator inhibitor-1 with venous thromboembolism". The Journal of Laboratory and Clinical Medicine. 121 (5): 646–53. PMID8478593.
Gorgani NN, Parish CR, Easterbrook Smith SB, Altin JG (June 1997). "Histidine-rich glycoprotein binds to human IgG and C1q and inhibits the formation of insoluble immune complexes". Biochemistry. 36 (22): 6653–62. doi:10.1021/bi962573n. PMID9184145.
Shigekiyo T, Yoshida H, Matsumoto K, Azuma H, Wakabayashi S, Saito S, Fujikawa K, Koide T (January 1998). "HRG Tokushima: molecular and cellular characterization of histidine-rich glycoprotein (HRG) deficiency". Blood. 91 (1): 128–33. PMID9414276.
Wakabayashi S, Takahashi K, Koide T (March 1999). "Structural characterization of the gene for human histidine-rich glycoprotein, reinvestigation of the 5'-terminal region of cDNA and a search for the liver specific promoter in the gene". Journal of Biochemistry. 125 (3): 522–30. doi:10.1093/oxfordjournals.jbchem.a022316. PMID10050040.
Gorgani NN, Altin JG, Parish CR (August 1999). "Histidine-rich glycoprotein regulates the binding of monomeric IgG and immune complexes to monocytes". International Immunology. 11 (8): 1275–82. doi:10.1093/intimm/11.8.1275. PMID10421785.