Protein Shape – Levels Of Protein Structure – Shape Of Proteins – What Is Protein Denaturation

Protein Shape – Levels Of Protein Structure – Shape Of Proteins – What Is Protein Denaturation


The shape of proteins. There are 4 different levels of
protein structure, or protein shape. Primary, secondary, tertiary or the third
level, and quaternary or the fourth level. The primary or 1st level of protein
structure is a chain like or linear sequence of amino acids joined by
peptide bonds as you can see here. The secondary or 2nd level has
2 shapes, an alpha helix or coil like formation, or a folded
pattern called a beta sheet. In both of these structures
hydrogen bonds between the R groups of the amino acids stabilize
the shape of the protein. The tertiary or 3rd level of
protein structure involves more folding and bonding of
the secondary structure. The coils may even touch each
other as some covalent bonds form from the sharing of electrons
between different amino acids, but most of these twists and folds
occur from the result of ionic bonds between positively and negatively
charged R groups of the amino acids. The quaternary or 4th level is
where clusters of more than one polypeptide chain link together
to form a giant molecule. Many different types of bonds may
be formed within this structure. The shape of a protein is important,
for instance, fibrous proteins are extended linear proteins that are part
of ligaments, tendons and muscles, and globular proteins fold
into almost spherical shapes and have their hydrophobic
or water fearing R groups buried deep within the core, and
their hydrophilic or water loving R groups extended out into the water
when in an aqueous environment. Proteins take their shape based on
the job they are required to perform and some have moving parts that
are important to their functions. Proteins can have their structure
or shaped altered by denaturation. When this happens, the protein is no
longer able to carry out its job. Denaturation can take place
because of change of temperature; change in pH, or the presence
of certain hazardous chemicals. And that, be the basics
on the shape of proteins.