Chapter 18, Problem 18.37UKC

Interpretation Introduction

Interpretation:

Characteristics of fibrous and globular protein has to be identified.

Concept introduction:

• Many amino acids are linked together through amide bonds to form a biologically large molecule known to be proteins.
• Amino functional group is $(-N{H}_2)$ and carboxyl functional group is $(-COOH)$ and a $R$ (alkyl) group is considered as side chain, when all these are bonded to same carbon atom.
• Secondary structure of protein is the repeating structural patterns ($\text{α-helix}$ and $\text{β-sheets}$) formed by hydrogen bonding between backbone atoms of the neighboring segments of protein.
• $\text{α-helix}$ is the secondary protein structure in which a protein chain form a right handed coil stabilizes by hydrogen bonds between peptide groups along its backbone.
• Fibrous protein is a tough, water insoluble protein whose protein chains form fibers or sheets, mainly contains $\alpha -helices$ .
• Globular protein is a water soluble protein whose chain is folded in a compact shape mainly contains $\alpha -helices$ and $\beta -sheets$ .