[BiO BB] what is the minimum length of protein? and why differentiate protein & peptides

[Ayyagari Kiran]

hi,
1)what is the minimu length of  A protein ?
(please mention the minimal possible length of
protein, its minimal mol wt(in kDa) and also types of
proteins by example.

2) is it that a biomolecule can be called as a protein
based on its structural organization (like if domains
are present)
or 
is it that a biomolecule can be called as protein
based on Functional implications??like example can be
toxin of 55 amino acids causes raise in antibodies
production. why is it not called a protein and why it
is called a peptide toxin despite having amino acids.
  
thanks in advance

A.S.Kiran


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