Physicochemical Properties of Peptide



PPepDB ID:PPepDB_5501
Number of amino acids:87
Molecular Weight:10131.96 Da
Theoretical pI:8.55


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)22.3%
Cysteine CYS (C)1011.49%
Glutamic Acid GLU (E)78.05%
Aspartic Acid ASP (D)44.6%
Glycine GLY (G)44.6%
Phynylalanine PHE (F)66.9%
Isoleucine ILE (I)22.3%
Histidine HIS (H)33.45%
Lysine LYS (K)1112.64%
Methionine MET (M)33.45%
Leucine LEU (L)89.2%
Asparagine ASN (N)44.6%
Glutamine GLN (Q)00%
Proline PRO (P)00%
Serine SER (S)44.6%
Arginine ARG (R)44.6%
Threonine THR (T)55.75%
Tryptophan TRP (W)00%
Valine VAL (V)78.05%
Tyrosine TYR (Y)33.45%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC442
HydrogenH704
NitrogenN120
OxygenO126
SulphurS13

FormulaC442H704N120O126S13
Total Number of Atoms:1405


Total number of positively charged residues (ARG + LYS):15
Total number of negatively charged residues (ASP + GLU):11
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    5095
Absorption 0.1% (=1 g/l)    0.503,   assuming all pairs of CYS residues form cystines

Ext. coefficient    4470
Absorption 0.1% (=1 g/l)    0.441,   assuming all CYS residues are reduced
Aromaticity:0.103

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 42.71

This indicates that the protein/peptide is unstable
Secondary Structure Fraction [Helix, Turn, Sheet]:[29.89, 13.79, 22.99]

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:70.4598
Grand average of hydropathicity (GRAVY):-0.18