Physicochemical Properties of Peptide



PPepDB ID:PPepDB_2061
Number of amino acids:28
Molecular Weight:3523.04 Da
Theoretical pI:9.17


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)13.57%
Cysteine CYS (C)414.29%
Glutamic Acid GLU (E)27.14%
Aspartic Acid ASP (D)310.71%
Glycine GLY (G)27.14%
Phynylalanine PHE (F)00%
Isoleucine ILE (I)00%
Histidine HIS (H)13.57%
Lysine LYS (K)310.71%
Methionine MET (M)27.14%
Leucine LEU (L)00%
Asparagine ASN (N)00%
Glutamine GLN (Q)27.14%
Proline PRO (P)00%
Serine SER (S)00%
Arginine ARG (R)621.43%
Threonine THR (T)00%
Tryptophan TRP (W)00%
Valine VAL (V)00%
Tyrosine TYR (Y)27.14%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC139
HydrogenH229
NitrogenN53
OxygenO43
SulphurS6

FormulaC139H229N53O43S6
Total Number of Atoms:470


Total number of positively charged residues (ARG + LYS):9
Total number of negatively charged residues (ASP + GLU):5
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    3230
Absorption 0.1% (=1 g/l)    0.917,   assuming all pairs of CYS residues form cystines

Ext. coefficient    2980
Absorption 0.1% (=1 g/l)    0.846,   assuming all CYS residues are reduced
Aromaticity:0.071

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 29.34

This indicates that the protein/peptide is stable
Secondary Structure Fraction [Helix, Turn, Sheet]:[7.14, 7.14, 17.86]

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:3.57143
Grand average of hydropathicity (GRAVY):-1.94