Physicochemical Properties of Peptide



PPepDB ID:PPepDB_4550
Number of amino acids:307
Molecular Weight:32963.01 Da
Theoretical pI:8.36


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)268.47%
Cysteine CYS (C)20.65%
Glutamic Acid GLU (E)144.56%
Aspartic Acid ASP (D)134.23%
Glycine GLY (G)299.45%
Phynylalanine PHE (F)134.23%
Isoleucine ILE (I)154.89%
Histidine HIS (H)10.33%
Lysine LYS (K)237.49%
Methionine MET (M)61.95%
Leucine LEU (L)278.79%
Asparagine ASN (N)216.84%
Glutamine GLN (Q)165.21%
Proline PRO (P)227.17%
Serine SER (S)134.23%
Arginine ARG (R)61.95%
Threonine THR (T)134.23%
Tryptophan TRP (W)00%
Valine VAL (V)3511.4%
Tyrosine TYR (Y)123.91%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC1491
HydrogenH2367
NitrogenN387
OxygenO437
SulphurS8

FormulaC1491H2367N387O437S8
Total Number of Atoms:4690


Total number of positively charged residues (ARG + LYS):29
Total number of negatively charged residues (ASP + GLU):27
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    18005
Absorption 0.1% (=1 g/l)    0.546,   assuming all pairs of CYS residues form cystines

Ext. coefficient    17880
Absorption 0.1% (=1 g/l)    0.542,   assuming all CYS residues are reduced
Aromaticity:0.081

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 24.35

This indicates that the protein/peptide is stable
Secondary Structure Fraction [Helix, Turn, Sheet]:[33.22, 27.69, 23.78]

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:94.8861
Grand average of hydropathicity (GRAVY):-0.03