Physicochemical Properties of Peptide



PPepDB ID:PPepDB_4100
Number of amino acids:182
Molecular Weight:17971.68 Da
Theoretical pI:6.54


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)2614.29%
Cysteine CYS (C)84.4%
Glutamic Acid GLU (E)31.65%
Aspartic Acid ASP (D)42.2%
Glycine GLY (G)137.14%
Phynylalanine PHE (F)94.95%
Isoleucine ILE (I)52.75%
Histidine HIS (H)52.75%
Lysine LYS (K)63.3%
Methionine MET (M)21.1%
Leucine LEU (L)2312.64%
Asparagine ASN (N)42.2%
Glutamine GLN (Q)10.55%
Proline PRO (P)137.14%
Serine SER (S)2915.93%
Arginine ARG (R)00%
Threonine THR (T)189.89%
Tryptophan TRP (W)00%
Valine VAL (V)137.14%
Tyrosine TYR (Y)00%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC794
HydrogenH1277
NitrogenN203
OxygenO249
SulphurS10

FormulaC794H1277N203O249S10
Total Number of Atoms:2533


Total number of positively charged residues (ARG + LYS):6
Total number of negatively charged residues (ASP + GLU):7
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    500
Absorption 0.1% (=1 g/l)    0.028,   assuming all pairs of CYS residues form cystines

Ext. coefficient    0
Absorption 0.1% (=1 g/l)    0.000,   assuming all CYS residues are reduced
Aromaticity:0.049

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 37.21

This indicates that the protein/peptide is stable
Secondary Structure Fraction [Helix, Turn, Sheet]:[27.47, 32.42, 29.67]

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:95.0001
Grand average of hydropathicity (GRAVY):0.64