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<p><b>New page</b></p><div>[[File:Protein_TNC_PDB_1ten.png|thumb|Protein TNC PDB 1ten]] == Beta-sandwich ==<br />
A '''beta-sandwich''' is a type of [[protein structure]] commonly found in [[proteins]]. It is characterized by two [[beta sheet]]s that are stacked against each other, forming a sandwich-like structure. The beta-sandwich is a common motif in many proteins and plays a crucial role in their stability and function.<br />
=== Structure ===<br />
The beta-sandwich structure consists of two beta sheets that are arranged in a parallel or anti-parallel orientation. The sheets are composed of beta strands, which are connected by loops of varying lengths. The beta strands are typically made up of amino acid residues that form hydrogen bonds with each other, stabilizing the structure.<br />
=== Function ===<br />
Beta-sandwich structures are versatile and can be found in a wide range of proteins with diverse functions. They can serve as binding sites for ligands, participate in protein-protein interactions, or contribute to the overall stability of the protein. The specific function of a beta-sandwich structure depends on the arrangement of the beta sheets and the amino acid residues involved.<br />
=== Examples ===<br />
One well-known example of a protein with a beta-sandwich structure is [[immunoglobulin G]] (IgG), a type of antibody. IgG molecules consist of two identical heavy chains and two identical light chains, with each chain containing multiple beta-sandwich domains. These domains play a crucial role in recognizing and binding to specific antigens.<br />
Another example of a protein with a beta-sandwich structure is [[fibronectin]], a glycoprotein that is involved in cell adhesion and migration. Fibronectin contains multiple beta-sandwich domains that interact with other proteins and cell surface receptors to mediate various cellular processes.<br />
=== Conclusion ===<br />
In conclusion, the beta-sandwich is a common protein structure that plays a key role in the stability and function of many proteins. Its versatile nature allows it to perform a variety of functions, making it an essential motif in the world of protein structure and function.<br />
[[Category:Protein structures]]<br />
[[Category:Biochemistry]]<br />
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