Fibrous protein
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Overview
Fibrous proteins, also called scleroproteins, are long filamentous protein molecules that form one of the two main classes of tertiary structure protein (the other being globular proteins). Fibrous proteins are only found in animals.
Fibrous proteins form 'rod' or 'wire' -like shapes and are usually inert structural or storage proteins. They are generally water-insoluble and are found as an aggregate due to hydrophobic R-groups that stick out of the molecule. The amino acid sequences they are made from often have limited residues with repeats. These can form unusual secondary structures, e.g. collagen triple helix. The structures often contain 'cross-links' between chains, for example cys-cys disulphide bonds between keratin chains.
Globular proteins tend to denature more easily than fibrous proteins.
Fibrous proteins are usually used to construct connective tissues, tendons, bone matrix and muscle fiber.
Examples of fibrous proteins include keratins, collagens and elastins.
External links
Proteins |
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Protein: fibrous proteins | |
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| Collagen | Type-I (COL1A1) - Type-II (COL2A1) - Type-III - Type-IV - Type-V - Type XI (COL11A2) - Type-XVII - Type-XVIII |
| Keratin/Cytokeratin | type I (10, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21), type II (1, 2A, 3, 4, 5, 6A, 7, 8, 9), Hair (Type I, Type II), Beta |
| other | Elastin - Cytoskeletal |
Acknowledgement and Attribution Regarding Sources of Content
Some of the initial content on this page may be incorporated in part from copyleft sources in the public domain including wikis such as Wikipedia and AskDrWiki. Drug information for patients came from the The National Library of Medicine. Infectious disease information may have come from the Centers for Disease Control (CDC). Differential Diagnoses are drawn from clinicians as well as an amalgamation of 3 sources: 1.The Disease Database; 2. Kahan, Scott, Smith, Ellen G. In A Page: Signs and Symptoms. Malden, Massachusetts: Blackwell Publishing, 2004:3; 3. Sailer, Christian, Wasner, Susanne. Differential Diagnosis Pocket. Hermosa Beach, CA: Borm Bruckmeir Publishing LLC, 2002:7 .
