Structure of Protein, Biology Lecture | Sabaq.pk

Описание: In this video, we’ll explore the structure of protein, a critical biomolecule with roles in the immune system, enzyme activity, muscle function, and blood composition. Proteins are made of amino acids, each containing a central carbon, an amino group, an R group, an acidic carboxyl group, and a hydrogen atom. These amino acids link via peptide bonds, releasing water to form long polypeptide chains.

Protein structure is organized into levels. The primary structure is the sequence of amino acids, determined by DNA and RNA. The secondary structure introduces shapes like the alpha helix and beta pleated sheets, stabilized by intermolecular hydrogen bonding. In the tertiary structure, proteins fold into complex, functional shapes, while the quaternary structure involves multiple polypeptides, such as hemoglobin, which contains iron in its heme group for oxygen transport. Proteins can be fibrous, like collagen and keratin, or globular and water-soluble, like insulin and albumin. Each level of structure is essential to the diverse functions proteins perform in biological systems.

00:00 Structure of Protein
3:06 Primary structure
10:09 Intermolecular hydrogen bonding
12:29 Hemoglobin structure

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