Physicochemical Properties of Peptide



PPepDB ID:PPepDB_5190
Number of amino acids:78
Molecular Weight:8642.46 Da
Theoretical pI:9.21


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)45.13%
Cysteine CYS (C)810.26%
Glutamic Acid GLU (E)33.85%
Aspartic Acid ASP (D)11.28%
Glycine GLY (G)67.69%
Phynylalanine PHE (F)22.56%
Isoleucine ILE (I)56.41%
Histidine HIS (H)11.28%
Lysine LYS (K)1114.1%
Methionine MET (M)45.13%
Leucine LEU (L)67.69%
Asparagine ASN (N)33.85%
Glutamine GLN (Q)33.85%
Proline PRO (P)33.85%
Serine SER (S)56.41%
Arginine ARG (R)11.28%
Threonine THR (T)22.56%
Tryptophan TRP (W)00%
Valine VAL (V)67.69%
Tyrosine TYR (Y)45.13%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC380
HydrogenH624
NitrogenN100
OxygenO104
SulphurS12

FormulaC380H624N100O104S12
Total Number of Atoms:1220


Total number of positively charged residues (ARG + LYS):12
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    6460
Absorption 0.1% (=1 g/l)    0.747,   assuming all pairs of CYS residues form cystines

Ext. coefficient    5960
Absorption 0.1% (=1 g/l)    0.690,   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 : 40.34

This indicates that the protein/peptide is unstable
Secondary Structure Fraction [Helix, Turn, Sheet]:[29.49, 21.79, 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:82.4359
Grand average of hydropathicity (GRAVY):0.10