the structure of proteins

all you need to know for the OCR, As syllabus on structure of proteins.

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The structure of proteins
Primary structure
This is the sequence of amino acids in the
polypeptide chain. It's important because the
sequence determines the eventual shape of the
protein and therefore its function.
There are 20 common amino acids and they can
be linked in any order along a polypeptide chain
to make any of the 100,000 known proteins.
Secondary structure

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Hydrogen bonding enables the chain of
amino acids (primary structure) to fold or turn
into itself to form either:
An - helix
A -pleated sheet
1) The - helix
H-bonds help keep the helix less
unstable. This helps globular proteins like
enzymes and antibodies maintain their
shape which is important for
their functions.…read more

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H-bonding between parallel chains results in
a flat structure which
becomes folded.
-pleated sheet are
rarer than -helixes and are
found in proteins with
structural functions e.g Silk.
Tertiary structure
This is the complex, 3D shape
the molecule forms when the
polypeptide chain twists and folds
around itself. The shape of the
molecule is maintained by 4 types of
bonds.…read more

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Quaternary structure
Many highly complex proteins consist of more
than one polypeptide chain.…read more



soooooo useful, thank you :D

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