Physicochemical Properties of Peptide



PPepDB ID:PPepDB_2343
Number of amino acids:27
Molecular Weight:2996.62 Da
Theoretical pI:8.34


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)00%
Cysteine CYS (C)622.22%
Glutamic Acid GLU (E)00%
Aspartic Acid ASP (D)27.41%
Glycine GLY (G)27.41%
Phynylalanine PHE (F)27.41%
Isoleucine ILE (I)13.7%
Histidine HIS (H)00%
Lysine LYS (K)27.41%
Methionine MET (M)13.7%
Leucine LEU (L)27.41%
Asparagine ASN (N)00%
Glutamine GLN (Q)00%
Proline PRO (P)311.11%
Serine SER (S)13.7%
Arginine ARG (R)27.41%
Threonine THR (T)311.11%
Tryptophan TRP (W)00%
Valine VAL (V)00%
Tyrosine TYR (Y)00%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC125
HydrogenH203
NitrogenN35
OxygenO36
SulphurS7

FormulaC125H203N35O36S7
Total Number of Atoms:406


Total number of positively charged residues (ARG + LYS):4
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    375
Absorption 0.1% (=1 g/l)    0.125,   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:0.074

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 45.87

This indicates that the protein/peptide is unstable
Secondary Structure Fraction [Helix, Turn, Sheet]:[18.52, 22.22, 11.11]

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:43.3333
Grand average of hydropathicity (GRAVY):0.09