name any 3 proteins which has least no.of amino acids?

Question

frostbite · Answer

Mind to elaborate what you ask for?
You just want random proteins with a specific size ($M_{r}$)?

anonymous · Answer

name any 3 proteins which contains minimum no.of amino acids?

frostbite · Answer

And what is the minimum? I mean some consider insulin (50 amino acid residues) as the minimum protein, but it all depends on what you set as definition....
But I list some proteins and hope it works out.


Cytochrome C (from human)                           104 residues
Ribonnuclease A (from bovine pancreas)         124 residues
Lysozyme (from chicken egg white)                 129 residues
Myoglobin ( from equine heart)                       153 residues
Chymotrypsin (from bovine)                            241 residues
Chymotrypsinogen (from bovine)                     245 residues
Hemoglobin (from human)                              574 residues
Serum alnumin (from human)                          609 residues
Hexokinase (from yeast)                                 972 residues
RNA polymerase (from E. coli)                         4,158 residues
Apolipoprotein B (from human)                        4,536 residues
Glutamine synthetase (from E. coli)                   5,628 residues
Titin (from human)                                          26,926 residues

After Lehninger 6e and PDB

thomaster · Answer

How about TRP-Cage
It only has 20 amino acids

frostbite · Answer

The very smallest I can think of: Glycylglycine (2 residues)

thomaster · Answer

But I guess you can manufacture any size protein. Are we talking about naturally occuring or artificial proteins?