Nitration shielding peptides that reduce or prevent nitration of a protein of interest are disclosed. The peptide can serve as molecular sink for nitrating agents, block access of the nitrating agents to the target tyrosine on the protein of interest, serve as substrate for the nitrating agent (i.e., provide an alternative nitratable tyrosine residue), provide a nitrating agent neutralizing moiety such as antioxidant, or a combination thereof. The nitration shielding peptide can be a fusion protein that includes one or more additional domains such a protein transduction domain, a targeting signal, a purification tag, or any combination thereof. Exemplary nitration shielding peptides for reducing nitration of RhoA and PKG-1α, and methods of use thereof for treating pathologies, disease, and disorders associated with nitration of RhoA and PKG-1α, respectively are also provided.