Immunoglobulin pentamer,molecular model. Immunoglobulin (Ig) proteins,also known as antibodies,are gamma globulin proteins that are part of the mammalian immune system. The Ig monomer is a Y-shaped molecule that consists of four polypeptide chains: two heavy chains (red) and two light chains (white). This form of Ig is IgM,five monomers of which have joined together to form a pentamer. An extra chain,the J chain (purple),helps bind the pentamer together. Pentameric IgM has 10 binding sites compared to the normal two of a monomer | |
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