Physicochemical Properties of Peptide



PPepDB ID:PPepDB_5880
Number of amino acids:213
Molecular Weight:21602.89 Da
Theoretical pI:4.42


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)2612.21%
Cysteine CYS (C)104.69%
Glutamic Acid GLU (E)52.35%
Aspartic Acid ASP (D)188.45%
Glycine GLY (G)3114.55%
Phynylalanine PHE (F)62.82%
Isoleucine ILE (I)52.35%
Histidine HIS (H)31.41%
Lysine LYS (K)20.94%
Methionine MET (M)52.35%
Leucine LEU (L)177.98%
Asparagine ASN (N)83.76%
Glutamine GLN (Q)73.29%
Proline PRO (P)94.23%
Serine SER (S)219.86%
Arginine ARG (R)104.69%
Threonine THR (T)115.16%
Tryptophan TRP (W)31.41%
Valine VAL (V)136.1%
Tyrosine TYR (Y)31.41%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC912
HydrogenH1429
NitrogenN269
OxygenO310
SulphurS15

FormulaC912H1429N269O310S15
Total Number of Atoms:2935


Total number of positively charged residues (ARG + LYS):12
Total number of negatively charged residues (ASP + GLU):23
Extinction Coefficient:Extinction coefficients are in units of M-1 cm-1, at 280 nm measured in water.

Ext. coefficient    21595
Absorption 0.1% (=1 g/l)    1.000,   assuming all pairs of CYS residues form cystines

Ext. coefficient    20970
Absorption 0.1% (=1 g/l)    0.971,   assuming all CYS residues are reduced
Aromaticity:0.056

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 63.91

This indicates that the protein/peptide is unstable
Secondary Structure Fraction [Helix, Turn, Sheet]:[22.07, 32.39, 24.88]

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:70.1878
Grand average of hydropathicity (GRAVY):-0.06