Physicochemical Properties of Peptide



PPepDB ID:PPepDB_5895
Number of amino acids:81
Molecular Weight:9457.05 Da
Theoretical pI:8.68


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)33.7%
Cysteine CYS (C)89.88%
Glutamic Acid GLU (E)33.7%
Aspartic Acid ASP (D)56.17%
Glycine GLY (G)33.7%
Phynylalanine PHE (F)89.88%
Isoleucine ILE (I)44.94%
Histidine HIS (H)00%
Lysine LYS (K)78.64%
Methionine MET (M)33.7%
Leucine LEU (L)44.94%
Asparagine ASN (N)67.41%
Glutamine GLN (Q)33.7%
Proline PRO (P)33.7%
Serine SER (S)33.7%
Arginine ARG (R)56.17%
Threonine THR (T)56.17%
Tryptophan TRP (W)00%
Valine VAL (V)56.17%
Tyrosine TYR (Y)33.7%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC416
HydrogenH646
NitrogenN112
OxygenO118
SulphurS11

FormulaC416H646N112O118S11
Total Number of Atoms:1303


Total number of positively charged residues (ARG + LYS):12
Total number of negatively charged residues (ASP + GLU):8
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    4970
Absorption 0.1% (=1 g/l)    0.526,   assuming all pairs of CYS residues form cystines

Ext. coefficient    4470
Absorption 0.1% (=1 g/l)    0.473,   assuming all CYS residues are reduced
Aromaticity:0.136

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 40.05

This indicates that the protein/peptide is unstable
Secondary Structure Fraction [Helix, Turn, Sheet]:[29.63, 18.52, 16.05]

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:60.1234
Grand average of hydropathicity (GRAVY):-0.21