Physicochemical Properties of Peptide



PPepDB ID:PPepDB_2782
Number of amino acids:30
Molecular Weight:3310.83 Da
Theoretical pI:4.02


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)13.33%
Cysteine CYS (C)620%
Glutamic Acid GLU (E)310%
Aspartic Acid ASP (D)310%
Glycine GLY (G)26.67%
Phynylalanine PHE (F)13.33%
Isoleucine ILE (I)310%
Histidine HIS (H)00%
Lysine LYS (K)00%
Methionine MET (M)13.33%
Leucine LEU (L)310%
Asparagine ASN (N)00%
Glutamine GLN (Q)13.33%
Proline PRO (P)13.33%
Serine SER (S)310%
Arginine ARG (R)26.67%
Threonine THR (T)00%
Tryptophan TRP (W)00%
Valine VAL (V)00%
Tyrosine TYR (Y)00%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC133
HydrogenH217
NitrogenN37
OxygenO47
SulphurS7

FormulaC133H217N37O47S7
Total Number of Atoms:441


Total number of positively charged residues (ARG + LYS):2
Total number of negatively charged residues (ASP + GLU):6
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)    0.113,   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:0.033

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 87.81

This indicates that the protein/peptide is unstable
Secondary Structure Fraction [Helix, Turn, Sheet]:[23.33, 20.00, 26.67]

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:81.3333
Grand average of hydropathicity (GRAVY):0.27