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Explainstructureandshapeofproteins.

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SOLUTION :Structure andshapeofproteinsarestudiedinfourlevels.
Primarystructure :Polypeptidechainsofa proteinhasamino acidslinkedwitheachother in aspecificsequence. Thisiscalledprimarystructure.
Secondary structure : Thesecondarystructure ofproteinis the SHAPE inwhicha longpolypeptidechainscanexists. They foundto EXISTIN twodifferenttypesofstructure.
(a)` prop`-helixstructure
(B)`beta ` -pleatedsheetstructure
In `prop`-helix , righthandedscrew( helix)structureisformedwhenpolypeptidechain twistwiththehelpofhydrogenbonds.
In `beta`- structureall peptidechainsarestrechedoutand laidsidebysidewhich areheldtogetherbyhydrogenbonding.
Tertiarystructure:Itrepresents overallfoldingof thepolypeptidechains.
It givestwomajorshapes.
(a) Fibrous
(b) Globular
The mainforce whichstabilizethestructures ofproteinsarehydrogenbondsanddisulphidelinkages.
Quaternarystructure :Proteinsare composedoftwoormorepolypeptidesubunits.Thespatialarrangement ofthesesubunitswithrespectto eachotherisknownasquaternarystructure.


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