Physicochemical Properties of Peptide



PPepDB ID:PPepDB_4391
Number of amino acids:363
Molecular Weight:38674.55 Da
Theoretical pI:4.75


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)4211.57%
Cysteine CYS (C)102.75%
Glutamic Acid GLU (E)82.2%
Aspartic Acid ASP (D)277.44%
Glycine GLY (G)256.89%
Phynylalanine PHE (F)174.68%
Isoleucine ILE (I)174.68%
Histidine HIS (H)51.38%
Lysine LYS (K)82.2%
Methionine MET (M)102.75%
Leucine LEU (L)349.37%
Asparagine ASN (N)267.16%
Glutamine GLN (Q)174.68%
Proline PRO (P)123.31%
Serine SER (S)308.26%
Arginine ARG (R)154.13%
Threonine THR (T)267.16%
Tryptophan TRP (W)00%
Valine VAL (V)267.16%
Tyrosine TYR (Y)82.2%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC1676
HydrogenH2657
NitrogenN469
OxygenO541
SulphurS20

FormulaC1676H2657N469O541S20
Total Number of Atoms:5363


Total number of positively charged residues (ARG + LYS):23
Total number of negatively charged residues (ASP + GLU):35
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    12545
Absorption 0.1% (=1 g/l)    0.324,   assuming all pairs of CYS residues form cystines

Ext. coefficient    11920
Absorption 0.1% (=1 g/l)    0.308,   assuming all CYS residues are reduced
Aromaticity:0.069

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 32.27

This indicates that the protein/peptide is stable
Secondary Structure Fraction [Helix, Turn, Sheet]:[28.10, 25.62, 25.90]

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:87.1349
Grand average of hydropathicity (GRAVY):0.04