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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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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[@neetbiologybyjunaidalam1217]

a correction doctor, insulin exhibit Quaternary structure...thank u

[@Rajesh_Jambhulkar]

It is a branched polypeptide with active primary structure

[@neetbiologybyjunaidalam1217]

@@Rajesh_Jambhulkar Sir, As Functional Insulin have got Two Peptide chains link together by disulphide linkage..isnt it should be quaternary? One more thing i want to ask..functional Myoglobin exhibit secondary or tertiary structure..as per my knowledge it got tertiary. correct me if i am wrong ur lectures r very amazing..such an awesome teacher u r. sorry for troubling you sir..just trying to learn some concepts..hope u donot mind

[@Rajesh_Jambhulkar]

Yes, myoglobin exhibit tertiary structure. Insulin has two polypeptide chains but it does not have quaternary structure. In quaternary structure, the bond involved is primarily non- covalent bond. In insulin two chains are connected by disulfide bond which is a covalent bond.

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[@muhammadhaseeb6016]

Sir How Can Insulin Have a Primary level of organization. It have two polypeptides having 21 and 30 Amino Acids. It Must Have a Quaternary Structure. Primary Structure is all about Single Polypeptide .Sir Plz Answer?

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Is myoglobin example of tertiary structure?

[@user-lt7rf3ow7s]

Yes

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

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

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Is that sufficient for MSc level..please reply

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[@santoshgupta1561]

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

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Sir g yeh Jo disulfide bond hota hai yeh Sirf tertiary structure main paya jata hai na 🤔 ya primary structure main bhi hota hai?

[@Rajesh_Jambhulkar]

Also In primary structure

[@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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Sir aapne myoglobin alpha helix mein bhi kaha aa and tertiary structure mein bhi

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[@santoshgupta1561]

Is it enough to say that further folding of primary structure leads to secondary structure....

[@Rajesh_Jambhulkar]

Folding of primary structure into helices or sheets(steric relationship of amino acids)

[@Rajesh_Jambhulkar]

Folding into geometrically ordered unit

[@nikj4436]

Sir 8:54 shouldnt it be A chain(intradisulphide bond)?

[@uokay9428]

Yup vasudevan mein A chain h

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Sir in some of the reference books it is written that the first and the last peptide bond don't make Hydrogen bonds

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Myoglobin is example of alpha helix or tertiary structure? You took it in both

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Why do we call insulin a primary protein even though it has two polypeptide chains?

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Very well explanation sir 👌 But I feel there is little more need about tertiary and quaternary structure.

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Thanks

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Dear Sir, Are primary and secondary structure proteins are functional protein? If they are not then what's the reason, kindly elaborate in detail.

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[@tanazanwar4207]

Intrachain disulfide bond between 6th and 11th cysteine residue is in A chain.

[@Rajesh_Jambhulkar]

Yes, correction is there

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