Physicochemical Properties of Peptide



PPepDB ID:PPepDB_5632
Number of amino acids:357
Molecular Weight:40001.29 Da
Theoretical pI:7.95


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)143.92%
Cysteine CYS (C)154.2%
Glutamic Acid GLU (E)246.72%
Aspartic Acid ASP (D)133.64%
Glycine GLY (G)236.44%
Phynylalanine PHE (F)185.04%
Isoleucine ILE (I)154.2%
Histidine HIS (H)102.8%
Lysine LYS (K)92.52%
Methionine MET (M)51.4%
Leucine LEU (L)3810.64%
Asparagine ASN (N)174.76%
Glutamine GLN (Q)164.48%
Proline PRO (P)195.32%
Serine SER (S)4312.04%
Arginine ARG (R)308.4%
Threonine THR (T)195.32%
Tryptophan TRP (W)30.84%
Valine VAL (V)205.6%
Tyrosine TYR (Y)61.68%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC1739
HydrogenH2752
NitrogenN512
OxygenO533
SulphurS20

FormulaC1739H2752N512O533S20
Total Number of Atoms:5556


Total number of positively charged residues (ARG + LYS):39
Total number of negatively charged residues (ASP + GLU):37
Extinction Coefficient:Extinction coefficients are in units of M-1 cm-1, at 280 nm measured in water.

Ext. coefficient    26315
Absorption 0.1% (=1 g/l)    0.658,   assuming all pairs of CYS residues form cystines

Ext. coefficient    25440
Absorption 0.1% (=1 g/l)    0.636,   assuming all CYS residues are reduced
Aromaticity:0.076

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 61.77

This indicates that the protein/peptide is unstable
Secondary Structure Fraction [Helix, Turn, Sheet]:[28.01, 28.57, 22.69]

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:78.0674
Grand average of hydropathicity (GRAVY):-0.35