Physicochemical Properties of Peptide



PPepDB ID:PPepDB_2125
Number of amino acids:28
Molecular Weight:2963.57 Da
Theoretical pI:7.77


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)27.14%
Cysteine CYS (C)621.43%
Glutamic Acid GLU (E)13.57%
Aspartic Acid ASP (D)00%
Glycine GLY (G)27.14%
Phynylalanine PHE (F)00%
Isoleucine ILE (I)414.29%
Histidine HIS (H)00%
Lysine LYS (K)27.14%
Methionine MET (M)00%
Leucine LEU (L)00%
Asparagine ASN (N)13.57%
Glutamine GLN (Q)00%
Proline PRO (P)27.14%
Serine SER (S)27.14%
Arginine ARG (R)00%
Threonine THR (T)27.14%
Tryptophan TRP (W)13.57%
Valine VAL (V)27.14%
Tyrosine TYR (Y)13.57%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC127
HydrogenH204
NitrogenN32
OxygenO37
SulphurS6

FormulaC127H204N32O37S6
Total Number of Atoms:406


Total number of positively charged residues (ARG + LYS):2
Total number of negatively charged residues (ASP + GLU):1
Extinction Coefficient:Extinction coefficients are in units of M-1 cm-1, at 280 nm measured in water.

Ext. coefficient    7365
Absorption 0.1% (=1 g/l)    2.485,   assuming all pairs of CYS residues form cystines

Ext. coefficient    6990
Absorption 0.1% (=1 g/l)    2.359,   assuming all CYS residues are reduced
Aromaticity:0.071

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 29.37

This indicates that the protein/peptide is stable
Secondary Structure Fraction [Helix, Turn, Sheet]:[28.57, 25.00, 10.71]

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:83.5714
Grand average of hydropathicity (GRAVY):0.75