Primary Structure and Secondary Structure of Proteins

https://www.youtube.com/watch?v=1BhfCbCitn8

Whats the primary structure

It is simply the specific order of amino acids in a polypeptide,

The primary structure helps to determine the final 3d shape of the protein molecule, the shape of a protein is critical for its function

Primary structure of polypeptide is determined by DNA sequence of the gene which encodes that polypeptide

What is shown in a polypeptide chain

We have C=O groups and N-H groups.

The oxygen atoms in the C=O groups have small negative charge, hydrogen in N-H groups have small positive charge

The pos and neg charges can attract, and this causes hydrogen bonds to form between amino acids all along chain

What does hydrogen bond in polypeptide chain do

Causes polypeptide chain to twist and fold into shapes, these twists and folds are called secondary structure

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