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Biomolecules
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Structure of Proteins
Primary Structure: Sequence of amino acids
The primary structure of a protein is the sequence of amino acids in a polypeptide chain.
Terms:
Amino Acid
Building block of proteins
Secondary Structure: \alpha-helix and \beta-sheet
The secondary structure refers to local folded structures that form within a polypeptide due to interactions between atoms of the backbone.
Terms:
-helix
Right-handed coil
-sheet
Sheet-like structure
Tertiary Structure: 3D folding of a single polypeptide chain
The tertiary structure is the overall three-dimensional structure of a polypeptide.
Terms:
Disulfide Bond
Covalent bond between sulfur atoms
Quaternary Structure: Assembly of multiple polypeptides
The quaternary structure is the arrangement of multiple folded protein molecules in a multi-subunit complex.
Terms:
Subunit
Individual polypeptide in a protein complex
Proteins have four levels of structure: primary, secondary, tertiary, and quaternary. Each level of structure is crucial for the protein's function.
Common Use:
Understanding protein structure is essential for fields like biochemistry and molecular biology.
Biochemistry
Proteins
Structure
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