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Transcript
Levels of Protein Structure
It is the sequence of a
chain of amino acids
joined by peptide
(amide) bonds.
Refers to the formation
of a regular pattern of
twists or kinks of the
polypeptide chain. The
regularity is due to
hydrogen bonds formed
between the atoms of the
amino acid backbone of
the polypeptide chain.
The two most common
types of secondary
structure are the ones
shown. (alpha helix and
beta pleated sheet.)
It is the three dimensional structure
formed by the bending and twisting
of the polypeptide chain. This structure
is stabilized by the interactions among
the side chains of the amino acids
forming the polypeptide.
This level of structure
refers to the fact that
some proteins contain
more than one
polypeptide chain,
adding an additional
level of structural
organization: the
association of the
polypeptide chains or
‘subunits’. The subunits
can be the same
polypeptide chain or
different ones.