Physicochemical Properties of Peptide



PPepDB ID:PPepDB_2675
Number of amino acids:35
Molecular Weight:4372.35 Da
Theoretical pI:8.69


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)25.71%
Cysteine CYS (C)25.71%
Glutamic Acid GLU (E)00%
Aspartic Acid ASP (D)00%
Glycine GLY (G)00%
Phynylalanine PHE (F)00%
Isoleucine ILE (I)925.71%
Histidine HIS (H)25.71%
Lysine LYS (K)00%
Methionine MET (M)38.57%
Leucine LEU (L)25.71%
Asparagine ASN (N)00%
Glutamine GLN (Q)00%
Proline PRO (P)00%
Serine SER (S)25.71%
Arginine ARG (R)25.71%
Threonine THR (T)25.71%
Tryptophan TRP (W)00%
Valine VAL (V)12.86%
Tyrosine TYR (Y)822.86%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC208
HydrogenH313
NitrogenN45
OxygenO48
SulphurS5

FormulaC208H313N45O48S5
Total Number of Atoms:619


Total number of positively charged residues (ARG + LYS):2
Total number of negatively charged residues (ASP + GLU):0
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    12045
Absorption 0.1% (=1 g/l)    2.755,   assuming all pairs of CYS residues form cystines

Ext. coefficient    11920
Absorption 0.1% (=1 g/l)    2.726,   assuming all CYS residues are reduced
Aromaticity:0.229

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 86.57

This indicates that the protein/peptide is unstable
Secondary Structure Fraction [Helix, Turn, Sheet]:[57.14, 5.71, 20.00]

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:136.571
Grand average of hydropathicity (GRAVY):1.08