Physicochemical Properties of Peptide



PPepDB ID:PPepDB_3478
Number of amino acids:78
Molecular Weight:8663.35 Da
Theoretical pI:8.84


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)56.41%
Cysteine CYS (C)911.54%
Glutamic Acid GLU (E)45.13%
Aspartic Acid ASP (D)11.28%
Glycine GLY (G)45.13%
Phynylalanine PHE (F)45.13%
Isoleucine ILE (I)45.13%
Histidine HIS (H)33.85%
Lysine LYS (K)45.13%
Methionine MET (M)22.56%
Leucine LEU (L)810.26%
Asparagine ASN (N)22.56%
Glutamine GLN (Q)11.28%
Proline PRO (P)33.85%
Serine SER (S)67.69%
Arginine ARG (R)67.69%
Threonine THR (T)45.13%
Tryptophan TRP (W)00%
Valine VAL (V)78.97%
Tyrosine TYR (Y)11.28%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC376
HydrogenH615
NitrogenN109
OxygenO103
SulphurS11

FormulaC376H615N109O103S11
Total Number of Atoms:1214


Total number of positively charged residues (ARG + LYS):10
Total number of negatively charged residues (ASP + GLU):5
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)    0.230,   assuming all pairs of CYS residues form cystines

Ext. coefficient    1490
Absorption 0.1% (=1 g/l)    0.172,   assuming all CYS residues are reduced
Aromaticity:0.064

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 47.54

This indicates that the protein/peptide is unstable
Secondary Structure Fraction [Helix, Turn, Sheet]:[30.77, 19.23, 24.36]

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:92.4359
Grand average of hydropathicity (GRAVY):0.37