Physicochemical Properties of Peptide



PPepDB ID:PPepDB_2488
Number of amino acids:28
Molecular Weight:3113.58 Da
Theoretical pI:6.1


Amino Acid Composition:


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


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC130
HydrogenH198
NitrogenN36
OxygenO41
SulphurS6

FormulaC130H198N36O41S6
Total Number of Atoms:411


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    375
Absorption 0.1% (=1 g/l)    0.120,   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:0.143

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 67.91

This indicates that the protein/peptide is unstable
Secondary Structure Fraction [Helix, Turn, Sheet]:[25.00, 21.43, 17.86]

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:41.7857
Grand average of hydropathicity (GRAVY):0.41