anybody knws is the tertiary structure of protein determines its bond formation or the quaternary structure? is it true if i say both these structures consists of bonds like disulfide bonds or ionic bonds etc.?
When the polypetide in its primary structure (string of beads) starts to fold, the R groups of the amino acid side chains come close to each other.
This can lead to ionic bonds and disulphide bonds, which help to create a functional 3D shape = tertiary structure
Molecules in the tertiary structure can use hydrogen/disulphide/ionic and other interactions to form bonds with other molecules also folded in the tertiary structure, which leads to a quarternary structure.
(I have left secondary structure out deliberately, to avoid confusion)