Physicochemical Properties of Peptide



PPepDB ID:PPepDB_5614
Number of amino acids:117
Molecular Weight:11425.57 Da
Theoretical pI:8.99


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)2218.8%
Cysteine CYS (C)108.55%
Glutamic Acid GLU (E)10.85%
Aspartic Acid ASP (D)10.85%
Glycine GLY (G)1512.82%
Phynylalanine PHE (F)00%
Isoleucine ILE (I)97.69%
Histidine HIS (H)21.71%
Lysine LYS (K)86.84%
Methionine MET (M)32.56%
Leucine LEU (L)97.69%
Asparagine ASN (N)65.13%
Glutamine GLN (Q)00%
Proline PRO (P)75.98%
Serine SER (S)75.98%
Arginine ARG (R)10.85%
Threonine THR (T)54.27%
Tryptophan TRP (W)00%
Valine VAL (V)75.98%
Tyrosine TYR (Y)43.42%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC495
HydrogenH820
NitrogenN138
OxygenO144
SulphurS13

FormulaC495H820N138O144S13
Total Number of Atoms:1610


Total number of positively charged residues (ARG + LYS):9
Total number of negatively charged residues (ASP + GLU):2
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    6585
Absorption 0.1% (=1 g/l)    0.576,   assuming all pairs of CYS residues form cystines

Ext. coefficient    5960
Absorption 0.1% (=1 g/l)    0.522,   assuming all CYS residues are reduced
Aromaticity:0.034

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 29.16

This indicates that the protein/peptide is stable
Secondary Structure Fraction [Helix, Turn, Sheet]:[24.79, 29.91, 29.91]

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:96.1539
Grand average of hydropathicity (GRAVY):0.62