proline

Thân thiện

A scientist examines a molecular model of proline in the laboratory.

Definition

Noun: * An amino acid that is a fundamental component of many proteins, most notably collagen. It is unique among the standard amino acids because its side chain forms a cyclic structure, linking back to the amino group. This structure influences the shape and stability of proteins.

Usage

• Proline is a non-essential amino acid, meaning the human body can synthesize it.
• The presence of proline in a protein chain often causes a bend or kink in its structure.
• High concentrations of proline are found in connective tissues like collagen and elastin.

Examples

• The protein collagen is particularly rich in the amino acid proline.
• Researchers studied the role of proline in plant stress responses.
• A mutation that alters a proline residue can disrupt the proper folding of a protein.

Advanced Usage

• Proline-rich regions: Specific sequences in a protein that contain a high frequency of proline residues, often involved in protein-protein interactions.
  • The transcription factor contains a proline-rich activation domain.
• Proline isomerization: The process where proline switches between two distinct ring conformations (cis and trans), which can be a rate-limiting step in protein folding.
  • The enzyme catalyzes proline isomerization to assist in protein folding.

Variants and Related Words

• Hydroxyproline (noun): A modified form of proline that contains an additional hydroxyl (-OH) group. It is a critical component of collagen and is formed by an enzymatic reaction after proline is incorporated into the protein chain.
  • Hydroxyproline provides additional stability to the collagen triple helix.

Synonyms

• Amino acid (general category)
• Imino acid (specific chemical classification due to its cyclic structure)

Related Terms and Concepts

• Collagen: The primary structural protein in connective tissue, characterized by its high proline and glycine content.
• Protein synthesis: The cellular process of building proteins, during which proline is incorporated by its specific transfer RNA (tRNA).
• Secondary structure: The local folded structures in a protein, such as alpha helices and beta sheets, which are influenced by proline's ability to disrupt regular patterns.

Học thuật

Noun

1. an amino acid that is found in many proteins (especially collagen)