These domains undergo folding to form a globular molecule. The polypeptide chains in globular proteins are arranged in the form of domains. Globular proteins have tertiary structure as guided by the primary arrangement of amino acids in the polypeptide chains.
We will study various examples of globular proteins with special emphasis on hemoglobin. In this article, we will read about the structure of globular proteins, their properties as well as functions performed by them. Hemoglobin and Myoglobin are the two most important globular proteins found in the human body. Various amino acid chains are folded to form a globular structure. Structural proteins are fibrous in nature while most of the functional proteins have globular structure.Īs the name indicates, globular proteins have structure that resembles a ball or a globe. On the basis of the final shape of a protein molecule, they are divided into two classes fibrous proteins and globular proteins. The final shape of protein molecule is determined by the arrangement of amino acids within it. Proteins are made up of hundreds to thousands of amino acids. Other functional molecules such as ion channels, transport molecules, hormones, contractile molecules, etc. Enzymes, needed for any biochemical reaction to take place in a cell, are proteins in nature. They are present in every organelle and every cell of a living organism.Īlmost all the functions of a cell are carried out by proteins. As structural molecules, they are present in nuclear material, cell membrane, cytoskeleton, etc.
They play structural as well as functional roles in the bodies of living organisms. Proteins are the most abundant molecules found in living organisms.
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