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Current Medicinal Chemistry


ISSN (Print): 0929-8673
ISSN (Online): 1875-533X

The ERp57/GRp58/1,25D3-MARRS Receptor: Multiple Functional Roles in Diverse Cell Systems

Author(s): R. C. Khanal and I. Nemere

Volume 14, Issue 10, 2007

Page: [1087 - 1093] Pages: 7

DOI: 10.2174/092986707780362871

Price: $65


ERp57/GRp58 is a thiol-protein disulphide oxidoreductase and has been studied in many clinically relevant systems, both as a chaperone protein and as a membrane receptor for the steroid hormone, 1,25(OH)2D3. Our laboratory investigates phenomena associated with rapid, membrane-initiated signaling by steroid hormones synthesized from vitamin D (cholecalciferol). We have recently reported that the cell surface receptor for the metabolite 1,25-dihydroxyvitamin D3 [1,25(OH)2D3], which we have termed the 1,25D3-MARRS (Membrane Associated, Rapid Response Steroid binding) receptor, is in fact identical to ERp57/GRp58. Here we review the dynamic role ERp57/GRp58/1,25D3-MARRS receptor plays in a variety of cellular processes. Starting with its structure at the DNA and protein levels, we review the available literature about its role as a chaperone protein, in immune function through the assembly of MHC class I molecules, DNA binding, and its function as the 1,25D3-MARRS receptor. Finally, we present the role it may play in relation to important disease states. While ERp57/GR58/1,25D3-MARRS receptor is a pivotal protein in many cell functions, it has yet to be determined whether-and to what extent-these phenomena are regulated by the vitamin D endocrine system. However, 1,25(OH)2D3 is involved in differentiation of certain cancer cells and in muscle function, and ERp57/1,25D3-MARRS protein has been reported to be involved in such processes. Thus, medicinal chemistry aimed at the 1,25D3-MARRS receptor in lymphocytes, cancer cells, bone, intestinal epithelia, and kidney may add to the current therapeutic regimens for various disease states.

Keywords: Thiol:protein disulphide oxidoreductase, PDIA3, ERp57, GRp58, 1,25D3-MARRS receptor, Vitamin D, chaperone, immune system, diseases, DNA binding

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