Physicochemical Properties of Peptide



PPepDB ID:PPepDB_4621
Number of amino acids:326
Molecular Weight:36253.4 Da
Theoretical pI:6.36


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)257.67%
Cysteine CYS (C)103.07%
Glutamic Acid GLU (E)175.21%
Aspartic Acid ASP (D)247.36%
Glycine GLY (G)195.83%
Phynylalanine PHE (F)185.52%
Isoleucine ILE (I)164.91%
Histidine HIS (H)61.84%
Lysine LYS (K)226.75%
Methionine MET (M)113.37%
Leucine LEU (L)267.98%
Asparagine ASN (N)175.21%
Glutamine GLN (Q)82.45%
Proline PRO (P)113.37%
Serine SER (S)257.67%
Arginine ARG (R)175.21%
Threonine THR (T)206.13%
Tryptophan TRP (W)00%
Valine VAL (V)247.36%
Tyrosine TYR (Y)103.07%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC1591
HydrogenH2520
NitrogenN436
OxygenO489
SulphurS21

FormulaC1591H2520N436O489S21
Total Number of Atoms:5057


Total number of positively charged residues (ARG + LYS):39
Total number of negatively charged residues (ASP + GLU):41
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    15525
Absorption 0.1% (=1 g/l)    0.428,   assuming all pairs of CYS residues form cystines

Ext. coefficient    14900
Absorption 0.1% (=1 g/l)    0.411,   assuming all CYS residues are reduced
Aromaticity:0.086

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 40.24

This indicates that the protein/peptide is unstable
Secondary Structure Fraction [Helix, Turn, Sheet]:[28.83, 22.09, 24.23]

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:79.2638
Grand average of hydropathicity (GRAVY):-0.22