Physicochemical Properties of Peptide



PPepDB ID:PPepDB_4230
Number of amino acids:137
Molecular Weight:14392.07 Da
Theoretical pI:8.77


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)118.03%
Cysteine CYS (C)96.57%
Glutamic Acid GLU (E)42.92%
Aspartic Acid ASP (D)32.19%
Glycine GLY (G)85.84%
Phynylalanine PHE (F)53.65%
Isoleucine ILE (I)53.65%
Histidine HIS (H)10.73%
Lysine LYS (K)118.03%
Methionine MET (M)10.73%
Leucine LEU (L)2014.6%
Asparagine ASN (N)118.03%
Glutamine GLN (Q)10.73%
Proline PRO (P)1611.68%
Serine SER (S)96.57%
Arginine ARG (R)10.73%
Threonine THR (T)85.84%
Tryptophan TRP (W)00%
Valine VAL (V)118.03%
Tyrosine TYR (Y)21.46%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC647
HydrogenH1053
NitrogenN165
OxygenO183
SulphurS10

FormulaC647H1053N165O183S10
Total Number of Atoms:2058


Total number of positively charged residues (ARG + LYS):12
Total number of negatively charged residues (ASP + GLU):7
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    3480
Absorption 0.1% (=1 g/l)    0.242,   assuming all pairs of CYS residues form cystines

Ext. coefficient    2980
Absorption 0.1% (=1 g/l)    0.207,   assuming all CYS residues are reduced
Aromaticity:0.051

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 38.69

This indicates that the protein/peptide is stable
Secondary Structure Fraction [Helix, Turn, Sheet]:[31.39, 32.12, 26.28]

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:102.482
Grand average of hydropathicity (GRAVY):0.30