Physicochemical Properties of Peptide



PPepDB ID:PPepDB_655
Number of amino acids:26
Molecular Weight:2773.32 Da
Theoretical pI:5.96


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)13.85%
Cysteine CYS (C)623.08%
Glutamic Acid GLU (E)13.85%
Aspartic Acid ASP (D)00%
Glycine GLY (G)13.85%
Phynylalanine PHE (F)27.69%
Isoleucine ILE (I)13.85%
Histidine HIS (H)00%
Lysine LYS (K)13.85%
Methionine MET (M)00%
Leucine LEU (L)13.85%
Asparagine ASN (N)13.85%
Glutamine GLN (Q)00%
Proline PRO (P)27.69%
Serine SER (S)311.54%
Arginine ARG (R)00%
Threonine THR (T)13.85%
Tryptophan TRP (W)00%
Valine VAL (V)415.38%
Tyrosine TYR (Y)13.85%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC120
HydrogenH186
NitrogenN28
OxygenO35
SulphurS6

FormulaC120H186N28O35S6
Total Number of Atoms:375


Total number of positively charged residues (ARG + LYS):1
Total number of negatively charged residues (ASP + GLU):1
Extinction Coefficient:This protein does not contain any Tryptophan residues. Experience shows that this could result in more than 10% error in the computed extinction coefficient.

Extinction coefficients are in units of M-1 cm-1, at 280 nm measured in water.

Ext. coefficient    1865
Absorption 0.1% (=1 g/l)    0.672,   assuming all pairs of CYS residues form cystines

Ext. coefficient    1490
Absorption 0.1% (=1 g/l)    0.537,   assuming all CYS residues are reduced
Aromaticity:0.115

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 35.31

This indicates that the protein/peptide is stable
Secondary Structure Fraction [Helix, Turn, Sheet]:[34.62, 26.92, 11.54]

Amino acids in helix: V, I, Y, F, W, L || Amino acids in turn: N, P, G, S || Amino acids in sheet: E, M, A, L
Aliphatic index:78.4615
Grand average of hydropathicity (GRAVY):1.10