16. Describe briefly the
primary,secondary ,and tertiary structures of proteins.State the importance
of these structure which are related to
the properties of protein.
Answer:
The Primary structure of protein refers to the linear
sequence of amino acids in a polypeptide chain.The amino acids are linked by
peptide bonds .The polypeptides chain consists of an amino and a carboxyl
terminal .The R-group determines the properties of the protein .The sequence of
amino acids dictates the biological function of protein.The secondary structure
of protein refers to a way particular linear polypeptide chain is coiled or
pleated .It is dependent on the availability of specific R-groups of the amino
acids to form hydrogen bonds in the protein , to produce an α-helix or β-pleated structure.The α-helix structure provides elasticity to
protein. The β-pleated structure is highly resistant to stretching .The
tertiary structure of protein refers to the three-dimensional ,compact and
globular shape polypeptide . The arises when a polypeptide chain bends and
folds extensively.The tertiary structure is maintained by the interaction of
hydrogen bonds ,ionic bonds, disulphide bridges and hydrophobic interactions .A
protein denatures when its tertiary structure is destroyed .
Assignment submitted by C.Y., Tan, B.X., Loh, J.E., Tai, W.L., Kwan, G.H., Tan 2011/2012 (IBM)
No comments:
Post a Comment