Physicochemical Properties of Peptide



PPepDB ID:PPepDB_5181
Number of amino acids:118
Molecular Weight:11851.94 Da
Theoretical pI:8.59


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)2117.8%
Cysteine CYS (C)108.47%
Glutamic Acid GLU (E)10.85%
Aspartic Acid ASP (D)32.54%
Glycine GLY (G)97.63%
Phynylalanine PHE (F)10.85%
Isoleucine ILE (I)65.08%
Histidine HIS (H)00%
Lysine LYS (K)65.08%
Methionine MET (M)54.24%
Leucine LEU (L)97.63%
Asparagine ASN (N)119.32%
Glutamine GLN (Q)10.85%
Proline PRO (P)86.78%
Serine SER (S)43.39%
Arginine ARG (R)21.69%
Threonine THR (T)119.32%
Tryptophan TRP (W)00%
Valine VAL (V)86.78%
Tyrosine TYR (Y)21.69%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC503
HydrogenH838
NitrogenN142
OxygenO156
SulphurS15

FormulaC503H838N142O156S15
Total Number of Atoms:1654


Total number of positively charged residues (ARG + LYS):8
Total number of negatively charged residues (ASP + GLU):4
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    3605
Absorption 0.1% (=1 g/l)    0.304,   assuming all pairs of CYS residues form cystines

Ext. coefficient    2980
Absorption 0.1% (=1 g/l)    0.251,   assuming all CYS residues are reduced
Aromaticity:0.025

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 36.02

This indicates that the protein/peptide is stable
Secondary Structure Fraction [Helix, Turn, Sheet]:[22.03, 27.12, 30.51]

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:87.0339
Grand average of hydropathicity (GRAVY):0.44