Physicochemical Properties of Peptide



PPepDB ID:PPepDB_1674
Number of amino acids:28
Molecular Weight:3085.61 Da
Theoretical pI:6.87


Amino Acid Composition:


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


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC130
HydrogenH202
NitrogenN36
OxygenO39
SulphurS6

FormulaC130H202N36O39S6
Total Number of Atoms:413


Total number of positively charged residues (ARG + LYS):2
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    3355
Absorption 0.1% (=1 g/l)    1.087,   assuming all pairs of CYS residues form cystines

Ext. coefficient    2980
Absorption 0.1% (=1 g/l)    0.966,   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 : 22.50

This indicates that the protein/peptide is stable
Secondary Structure Fraction [Helix, Turn, Sheet]:[25.00, 21.43, 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:66.0715
Grand average of hydropathicity (GRAVY):0.06