Part-2
Fibrous proteins /collagen:
From my diagram I can observe the quaternary structure is 3 helical polypeptides which are looped around and is held by hydrogen bonds. The 3 stranded molecules runs parallel to others and the disulphide cross-linkages between the r-groups of the amino acid holds the molecules together forming fibres. Collagen molecules forms covalent bonds which are called cross links, with other collagen molecules next to it. The cross-links that form are shocked along the collagen molecules and adding to the strength of the molecules. This structure called a collagen fibril. Many fibrils together form a collagen fibre.
Globular proteins /haemoglobin: From my diagram I can observe that the quaternary structure …show more content…
A function of haemoglobin is to transport oxygen from the lungs to the tissues and returns carbon dioxide from the tissue to the lungs. Alpha globin chains contain 141(reference 1) amino acids but the beta globin chain creates 146 (reference 1) amino acids both these globin proteins have the same tertiary and secondary structures, Having 8 helical sections each.
Haemoglobin is a water soluble globular protein which is composed of two alpha polypeptide chains and two beta polypeptide chains and an inorganic prosthetic haem group. It function is to carry oxygen around in the blood and it is facilitated in doing so by the presence of the haem group.
Collagen: collagen is a fibrous protein which contains three polypeptide chains looped around each other. Each of these three chains is a coil itself. Hydrogen bonds are produced between these coils, which gives the structure strength. Collagen has numerous amounts of functions, which are to make the structure of bones .It also makes up cartilage and connective tissue, prevents blood that is being pumped at high pressure from bursting the walls of arteries also it is the main components of tendons which connect skeletal muscles to …show more content…
These from long rope like fibres with high tensile strength and are generally insoluble in water. Collagen is the main component of connective tissue such as ligaments, tendons and cartilage. Fibrous proteins are proteins that form long fibres and frequently consist of recurring sequence of amino acids, which are insoluble in water. In fibrous proteins the polypeptides form a long chain and these chains are linked by the disulphide cross bridges. This stabilizes the protein and makes it stronger. Fibrous proteins also increase strength due to interactions between the side chains of the