Physicochemical Properties of Peptide



PPepDB ID:PPepDB_5919
Number of amino acids:78
Molecular Weight:8865.71 Da
Theoretical pI:9.16


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)22.56%
Cysteine CYS (C)810.26%
Glutamic Acid GLU (E)45.13%
Aspartic Acid ASP (D)00%
Glycine GLY (G)33.85%
Phynylalanine PHE (F)56.41%
Isoleucine ILE (I)56.41%
Histidine HIS (H)22.56%
Lysine LYS (K)911.54%
Methionine MET (M)22.56%
Leucine LEU (L)911.54%
Asparagine ASN (N)33.85%
Glutamine GLN (Q)56.41%
Proline PRO (P)45.13%
Serine SER (S)56.41%
Arginine ARG (R)22.56%
Threonine THR (T)45.13%
Tryptophan TRP (W)00%
Valine VAL (V)56.41%
Tyrosine TYR (Y)11.28%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC395
HydrogenH645
NitrogenN105
OxygenO105
SulphurS10

FormulaC395H645N105O105S10
Total Number of Atoms:1260


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    1990
Absorption 0.1% (=1 g/l)    0.224,   assuming all pairs of CYS residues form cystines

Ext. coefficient    1490
Absorption 0.1% (=1 g/l)    0.168,   assuming all CYS residues are reduced
Aromaticity:0.077

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 45.70

This indicates that the protein/peptide is unstable
Secondary Structure Fraction [Helix, Turn, Sheet]:[32.05, 19.23, 21.79]

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:91.154
Grand average of hydropathicity (GRAVY):0.14