Physicochemical Properties of Peptide



PPepDB ID:PPepDB_866
Number of amino acids:251
Molecular Weight:25557.63 Da
Theoretical pI:5.9


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)3011.95%
Cysteine CYS (C)176.77%
Glutamic Acid GLU (E)51.99%
Aspartic Acid ASP (D)124.78%
Glycine GLY (G)3413.55%
Phynylalanine PHE (F)124.78%
Isoleucine ILE (I)62.39%
Histidine HIS (H)51.99%
Lysine LYS (K)62.39%
Methionine MET (M)20.8%
Leucine LEU (L)166.37%
Asparagine ASN (N)103.98%
Glutamine GLN (Q)31.2%
Proline PRO (P)135.18%
Serine SER (S)239.16%
Arginine ARG (R)83.19%
Threonine THR (T)228.76%
Tryptophan TRP (W)31.2%
Valine VAL (V)166.37%
Tyrosine TYR (Y)83.19%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC1108
HydrogenH1695
NitrogenN307
OxygenO352
SulphurS19

FormulaC1108H1695N307O352S19
Total Number of Atoms:3481


Total number of positively charged residues (ARG + LYS):14
Total number of negatively charged residues (ASP + GLU):17
Extinction Coefficient:Extinction coefficients are in units of M-1 cm-1, at 280 nm measured in water.

Ext. coefficient    29420
Absorption 0.1% (=1 g/l)    1.151,   assuming all pairs of CYS residues form cystines

Ext. coefficient    28420
Absorption 0.1% (=1 g/l)    1.112,   assuming all CYS residues are reduced
Aromaticity:0.092

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 35.66

This indicates that the protein/peptide is stable
Secondary Structure Fraction [Helix, Turn, Sheet]:[24.30, 31.87, 21.12]

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:64.6215
Grand average of hydropathicity (GRAVY):0.11