Physicochemical Properties of Peptide



PPepDB ID:PPepDB_6091
Number of amino acids:82
Molecular Weight:9148.99 Da
Theoretical pI:9.16


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)67.32%
Cysteine CYS (C)89.76%
Glutamic Acid GLU (E)11.22%
Aspartic Acid ASP (D)33.66%
Glycine GLY (G)67.32%
Phynylalanine PHE (F)44.88%
Isoleucine ILE (I)78.54%
Histidine HIS (H)22.44%
Lysine LYS (K)78.54%
Methionine MET (M)44.88%
Leucine LEU (L)44.88%
Asparagine ASN (N)22.44%
Glutamine GLN (Q)56.1%
Proline PRO (P)33.66%
Serine SER (S)33.66%
Arginine ARG (R)44.88%
Threonine THR (T)33.66%
Tryptophan TRP (W)00%
Valine VAL (V)78.54%
Tyrosine TYR (Y)33.66%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC402
HydrogenH650
NitrogenN112
OxygenO107
SulphurS12

FormulaC402H650N112O107S12
Total Number of Atoms:1283


Total number of positively charged residues (ARG + LYS):11
Total number of negatively charged residues (ASP + GLU):4
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    4970
Absorption 0.1% (=1 g/l)    0.543,   assuming all pairs of CYS residues form cystines

Ext. coefficient    4470
Absorption 0.1% (=1 g/l)    0.489,   assuming all CYS residues are reduced
Aromaticity:0.085

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 40.68

This indicates that the protein/peptide is unstable
Secondary Structure Fraction [Helix, Turn, Sheet]:[30.49, 17.07, 18.29]

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:84.3903
Grand average of hydropathicity (GRAVY):0.24