Physicochemical Properties of Peptide



PPepDB ID:PPepDB_1128
Number of amino acids:140
Molecular Weight:15126.51 Da
Theoretical pI:6.09


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)85.71%
Cysteine CYS (C)1510.71%
Glutamic Acid GLU (E)85.71%
Aspartic Acid ASP (D)85.71%
Glycine GLY (G)107.14%
Phynylalanine PHE (F)21.43%
Isoleucine ILE (I)64.29%
Histidine HIS (H)21.43%
Lysine LYS (K)75%
Methionine MET (M)32.14%
Leucine LEU (L)1410%
Asparagine ASN (N)75%
Glutamine GLN (Q)32.14%
Proline PRO (P)64.29%
Serine SER (S)128.57%
Arginine ARG (R)85.71%
Threonine THR (T)64.29%
Tryptophan TRP (W)00%
Valine VAL (V)128.57%
Tyrosine TYR (Y)32.14%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC636
HydrogenH1047
NitrogenN185
OxygenO204
SulphurS18

FormulaC636H1047N185O204S18
Total Number of Atoms:2090


Total number of positively charged residues (ARG + LYS):15
Total number of negatively charged residues (ASP + GLU):16
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    5345
Absorption 0.1% (=1 g/l)    0.353,   assuming all pairs of CYS residues form cystines

Ext. coefficient    4470
Absorption 0.1% (=1 g/l)    0.296,   assuming all CYS residues are reduced
Aromaticity:0.036

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 36.56

This indicates that the protein/peptide is stable
Secondary Structure Fraction [Helix, Turn, Sheet]:[26.43, 25.00, 23.57]

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:86.2857
Grand average of hydropathicity (GRAVY):0.01