Physicochemical Properties of Peptide



PPepDB ID:PPepDB_4105
Number of amino acids:420
Molecular Weight:43074.83 Da
Theoretical pI:5.44


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)5112.14%
Cysteine CYS (C)20.48%
Glutamic Acid GLU (E)153.57%
Aspartic Acid ASP (D)184.29%
Glycine GLY (G)255.95%
Phynylalanine PHE (F)143.33%
Isoleucine ILE (I)194.52%
Histidine HIS (H)51.19%
Lysine LYS (K)255.95%
Methionine MET (M)20.48%
Leucine LEU (L)4811.43%
Asparagine ASN (N)184.29%
Glutamine GLN (Q)71.67%
Proline PRO (P)337.86%
Serine SER (S)5613.33%
Arginine ARG (R)20.48%
Threonine THR (T)419.76%
Tryptophan TRP (W)00%
Valine VAL (V)296.9%
Tyrosine TYR (Y)102.38%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC1925
HydrogenH3090
NitrogenN486
OxygenO619
SulphurS4

FormulaC1925H3090N486O619S4
Total Number of Atoms:6124


Total number of positively charged residues (ARG + LYS):27
Total number of negatively charged residues (ASP + GLU):33
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    15025
Absorption 0.1% (=1 g/l)    0.349,   assuming all pairs of CYS residues form cystines

Ext. coefficient    14900
Absorption 0.1% (=1 g/l)    0.346,   assuming all CYS residues are reduced
Aromaticity:0.057

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 43.68

This indicates that the protein/peptide is unstable
Secondary Structure Fraction [Helix, Turn, Sheet]:[28.57, 31.43, 27.62]

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:94.3811
Grand average of hydropathicity (GRAVY):0.13