IB Biology Topic B1.2.10 Effect of Polar and Non-polar Amino Acids on Tertiary Structure of Proteins Revision Notes (HL)

IB Biology Topic B1.2.10 Effect of Polar and Non-polar Amino Acids on Tertiary Structure of Proteins Revision Notes (HL) | RevisionDojo

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Polar and Non-Polar Amino Acids: How Water Drives Protein Folding

Every amino acid in a protein has an R-group that is either polar (hydrophilic) or non-polar (hydrophobic).
This single property is the main factor determining how a protein folds into its tertiary structure.
Proteins fold in an aqueous (water-based) environment, so their R-groups sort themselves according to how they behave around water.
1. Non-polar R-groups are pushed inward to avoid water.
2. Polar R-groups stay on the surface, where they form hydrogen bonds with the surrounding solution.
This partitioning is the primary force that shapes the protein's three-dimensional conformation.

Example

Haemoglobin shows how polar and non-polar amino acids determine protein structure.
Its hydrophobic amino acids are buried inside the protein, stabilising the core.
Its hydrophilic amino acids face outward and interact with the watery environment of the blood.

Polar Amino Acids Sit on the Surface

Polar amino acids have R-groups that carry partial or full electrical charges, which makes them hydrophilic.
In globular proteins, polar amino acids are typically found on the outer surface, where they form hydrogen bonds with water molecules.

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Polar and Non-Polar Amino Acids: How Water Drives Protein Folding

Every amino acid in a protein has an R-group that is either polar (hydrophilic) or non-polar (hydrophobic).
This single property is the main factor determining how a protein folds into its tertiary structure.
Proteins fold in an aqueous (water-based) environment, so their R-groups sort themselves according to how they behave around water.
1. Non-polar R-groups are pushed inward to avoid water.
2. Polar R-groups stay on the surface, where they form hydrogen bonds with the surrounding solution.
This partitioning is the primary force that shapes the protein's three-dimensional conformation.

Example

Haemoglobin shows how polar and non-polar amino acids determine protein structure.
Its hydrophobic amino acids are buried inside the protein, stabilising the core.
Its hydrophilic amino acids face outward and interact with the watery environment of the blood.

Polar Amino Acids Sit on the Surface

Polar amino acids have R-groups that carry partial or full electrical charges, which makes them hydrophilic.
In globular proteins, polar amino acids are typically found on the outer surface, where they form hydrogen bonds with water molecules.

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Excepteur sint occaecat cupidatat non proident

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Sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris.
Duis aute irure dolor in reprehenderit in voluptate velit esse cillum.

A - Unity and Diversity9 subtopics

B - Form and Function10 subtopics

C - Interaction and Interdependence9 subtopics

D - Continuity and Change12 subtopics

IB Biology Topic B1.2.10: Effect of Polar and Non-polar Amino Acids on Tertiary Structure of Proteins Notes

A - Unity and Diversity9 subtopics

B - Form and Function10 subtopics

C - Interaction and Interdependence9 subtopics

D - Continuity and Change12 subtopics

Polar and Non-Polar Amino Acids: How Water Drives Protein Folding

Polar Amino Acids Sit on the Surface

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Polar and Non-Polar Amino Acids: How Water Drives Protein Folding

Polar Amino Acids Sit on the Surface

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Excepteur sint occaecat cupidatat non proident

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