IB Biology Topic B1.2.8 Pleating and Coiling of Secondary Structure of Proteins Revision Notes (HL)

IB Biology Topic B1.2.8 Pleating and Coiling of Secondary Structure of Proteins Revision Notes (HL) | RevisionDojo

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Secondary Structure: Regular Patterns from Backbone Hydrogen Bonds

Definition

Secondary structure of a protein

The secondary structure of a protein refers to the regular, repeating patterns that form when a polypeptide chain folds. These patterns arise from interactions between the amino acids in the backbone of the protein.

How Secondary Structure Forms

After a polypeptide chain is synthesised, hydrogen bonds form between atoms in the backbone, not the R-groups.
These bonds create repeating structural patterns called secondary structure.
The two main types are the alpha helix and the beta-pleated sheet.
In both cases, hydrogen bonds form between the carbonyl group (C=O) of one amino acid and the amine group (N-H) of another.
1. Because these bonds involve backbone atoms and not R-groups, secondary structure is set by the backbone geometry rather than the specific side chains.

Tip

Secondary structure comes from backbone hydrogen bonds (C=O to N-H).
Tertiary structure comes from R-group interactions.
Keep this distinction clear in exams.

The Alpha Helix: A Right-Handed Coil

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Secondary Structure: Regular Patterns from Backbone Hydrogen Bonds

Definition

Secondary structure of a protein

How Secondary Structure Forms

After a polypeptide chain is synthesised, hydrogen bonds form between atoms in the backbone, not the R-groups.
These bonds create repeating structural patterns called secondary structure.
The two main types are the alpha helix and the beta-pleated sheet.
In both cases, hydrogen bonds form between the carbonyl group (C=O) of one amino acid and the amine group (N-H) of another.
1. Because these bonds involve backbone atoms and not R-groups, secondary structure is set by the backbone geometry rather than the specific side chains.

Tip

Secondary structure comes from backbone hydrogen bonds (C=O to N-H).
Tertiary structure comes from R-group interactions.
Keep this distinction clear in exams.

The Alpha Helix: A Right-Handed Coil

Definition

Paywall

(on a website) an arrangement whereby access is restricted to users who have paid to subscribe to the site.

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Duis aute irure dolor in reprehenderit

Note

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Excepteur sint occaecat cupidatat non proident

Tip

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Sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
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A - Unity and Diversity9 subtopics

B - Form and Function10 subtopics

C - Interaction and Interdependence9 subtopics

D - Continuity and Change12 subtopics

IB Biology Topic B1.2.8: Pleating and Coiling of Secondary Structure of Proteins Notes

A - Unity and Diversity9 subtopics

B - Form and Function10 subtopics

C - Interaction and Interdependence9 subtopics

D - Continuity and Change12 subtopics

Secondary Structure: Regular Patterns from Backbone Hydrogen Bonds

How Secondary Structure Forms

The Alpha Helix: A Right-Handed Coil

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Secondary Structure: Regular Patterns from Backbone Hydrogen Bonds

How Secondary Structure Forms

The Alpha Helix: A Right-Handed Coil

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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