Physicochemical Properties of Peptide



PPepDB ID:PPepDB_2703
Number of amino acids:38
Molecular Weight:4195.94 Da
Theoretical pI:5.92


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)37.89%
Cysteine CYS (C)718.42%
Glutamic Acid GLU (E)25.26%
Aspartic Acid ASP (D)12.63%
Glycine GLY (G)513.16%
Phynylalanine PHE (F)12.63%
Isoleucine ILE (I)12.63%
Histidine HIS (H)00%
Lysine LYS (K)12.63%
Methionine MET (M)25.26%
Leucine LEU (L)410.53%
Asparagine ASN (N)12.63%
Glutamine GLN (Q)12.63%
Proline PRO (P)00%
Serine SER (S)25.26%
Arginine ARG (R)25.26%
Threonine THR (T)00%
Tryptophan TRP (W)00%
Valine VAL (V)12.63%
Tyrosine TYR (Y)410.53%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC177
HydrogenH273
NitrogenN47
OxygenO53
SulphurS9

FormulaC177H273N47O53S9
Total Number of Atoms:559


Total number of positively charged residues (ARG + LYS):3
Total number of negatively charged residues (ASP + GLU):3
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    6335
Absorption 0.1% (=1 g/l)    1.510,   assuming all pairs of CYS residues form cystines

Ext. coefficient    5960
Absorption 0.1% (=1 g/l)    1.420,   assuming all CYS residues are reduced
Aromaticity:0.132

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 29.14

This indicates that the protein/peptide is stable
Secondary Structure Fraction [Helix, Turn, Sheet]:[28.95, 21.05, 28.95]

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:66.8421
Grand average of hydropathicity (GRAVY):0.37