Structural organization of proteins

Correction- intrachain disulfide bond is there in A- chain, between 6th and 11th aminoacid.
Primary structure
Number and Sequence of AAs, peptide bond
example- insulin
Secondary
Alpha helix, beta sheets, bend, turn ,loop
Bonds- H bonds
example- Carbonic anhydrase, silk fibroin
Tertiary
3D, functional, enzymes
Bonds- hydrophobic interactions, H bonds, electrostatic forces, Van der Waal forces
example- alcohol DH, LDH, MDH, G3P DH, Mb
Quaternary
Two or more subunits together
example- Hb

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[@faizanquraishi4126]

Sir, the intrachain disulfide bond you drew on the b chain of insulin is supposed to be on the A chain.

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[@santoshgupta1561]

Do the disulphide bonds have any role in primary structure....

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[@proproot]

10:10 Where is angle?For angle to be formed there should be 3 points or 2 lines. Do these C alpha and N denote lines?

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[@sanjanarathore7012]

Thank you sir
Sir My question is if secondary structure involve only one polypeptide chain so why beta pleated sheath include in secondary structure while it contain h bond between two polypeptide chain???

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Random cool would qualify for which level of protein structure....

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Is myoglobin example of tertiary structure?

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But you didn't explained beta bends, types of it,how proline induce kinks,how glycine induce bends

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