Physicochemical Properties of Peptide



PPepDB ID:PPepDB_1414
Number of amino acids:252
Molecular Weight:26722.81 Da
Theoretical pI:7.8


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)145.56%
Cysteine CYS (C)187.14%
Glutamic Acid GLU (E)93.57%
Aspartic Acid ASP (D)103.97%
Glycine GLY (G)3212.7%
Phynylalanine PHE (F)114.37%
Isoleucine ILE (I)114.37%
Histidine HIS (H)51.98%
Lysine LYS (K)155.95%
Methionine MET (M)62.38%
Leucine LEU (L)187.14%
Asparagine ASN (N)72.78%
Glutamine GLN (Q)62.38%
Proline PRO (P)135.16%
Serine SER (S)239.13%
Arginine ARG (R)62.38%
Threonine THR (T)155.95%
Tryptophan TRP (W)41.59%
Valine VAL (V)218.33%
Tyrosine TYR (Y)83.17%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC1177
HydrogenH1832
NitrogenN312
OxygenO350
SulphurS24

FormulaC1177H1832N312O350S24
Total Number of Atoms:3695


Total number of positively charged residues (ARG + LYS):21
Total number of negatively charged residues (ASP + GLU):19
Extinction Coefficient:Extinction coefficients are in units of M-1 cm-1, at 280 nm measured in water.

Ext. coefficient    35045
Absorption 0.1% (=1 g/l)    1.311,   assuming all pairs of CYS residues form cystines

Ext. coefficient    33920
Absorption 0.1% (=1 g/l)    1.269,   assuming all CYS residues are reduced
Aromaticity:0.091

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 46.46

This indicates that the protein/peptide is unstable
Secondary Structure Fraction [Helix, Turn, Sheet]:[28.97, 29.76, 18.65]

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:74.6032
Grand average of hydropathicity (GRAVY):0.11