Physicochemical Properties of Peptide



PPepDB ID:PPepDB_1306
Number of amino acids:121
Molecular Weight:12761.58 Da
Theoretical pI:5.6


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)1310.74%
Cysteine CYS (C)119.09%
Glutamic Acid GLU (E)75.79%
Aspartic Acid ASP (D)64.96%
Glycine GLY (G)64.96%
Phynylalanine PHE (F)00%
Isoleucine ILE (I)32.48%
Histidine HIS (H)21.65%
Lysine LYS (K)54.13%
Methionine MET (M)32.48%
Leucine LEU (L)75.79%
Asparagine ASN (N)64.96%
Glutamine GLN (Q)32.48%
Proline PRO (P)32.48%
Serine SER (S)97.44%
Arginine ARG (R)64.96%
Threonine THR (T)1310.74%
Tryptophan TRP (W)00%
Valine VAL (V)1613.22%
Tyrosine TYR (Y)21.65%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC527
HydrogenH881
NitrogenN157
OxygenO181
SulphurS14

FormulaC527H881N157O181S14
Total Number of Atoms:1760


Total number of positively charged residues (ARG + LYS):11
Total number of negatively charged residues (ASP + GLU):13
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    3605
Absorption 0.1% (=1 g/l)    0.282,   assuming all pairs of CYS residues form cystines

Ext. coefficient    2980
Absorption 0.1% (=1 g/l)    0.234,   assuming all CYS residues are reduced
Aromaticity:0.017

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 31.60

This indicates that the protein/peptide is stable
Secondary Structure Fraction [Helix, Turn, Sheet]:[23.14, 19.83, 24.79]

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:81.3222
Grand average of hydropathicity (GRAVY):0.07