Physicochemical Properties of Peptide



PPepDB ID:PPepDB_1014
Number of amino acids:173
Molecular Weight:17638.67 Da
Theoretical pI:4.95


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)2112.14%
Cysteine CYS (C)105.78%
Glutamic Acid GLU (E)10.58%
Aspartic Acid ASP (D)84.62%
Glycine GLY (G)2313.29%
Phynylalanine PHE (F)116.36%
Isoleucine ILE (I)95.2%
Histidine HIS (H)21.16%
Lysine LYS (K)10.58%
Methionine MET (M)31.73%
Leucine LEU (L)95.2%
Asparagine ASN (N)95.2%
Glutamine GLN (Q)95.2%
Proline PRO (P)116.36%
Serine SER (S)179.83%
Arginine ARG (R)52.89%
Threonine THR (T)148.09%
Tryptophan TRP (W)21.16%
Valine VAL (V)52.89%
Tyrosine TYR (Y)31.73%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC763
HydrogenH1161
NitrogenN213
OxygenO244
SulphurS13

FormulaC763H1161N213O244S13
Total Number of Atoms:2394


Total number of positively charged residues (ARG + LYS):6
Total number of negatively charged residues (ASP + GLU):9
Extinction Coefficient:Extinction coefficients are in units of M-1 cm-1, at 280 nm measured in water.

Ext. coefficient    16095
Absorption 0.1% (=1 g/l)    0.912,   assuming all pairs of CYS residues form cystines

Ext. coefficient    15470
Absorption 0.1% (=1 g/l)    0.877,   assuming all CYS residues are reduced
Aromaticity:0.092

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 39.58

This indicates that the protein/peptide is stable
Secondary Structure Fraction [Helix, Turn, Sheet]:[22.54, 34.68, 19.65]

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:61.0982
Grand average of hydropathicity (GRAVY):0.07