Physicochemical Properties of Peptide



PPepDB ID:PPepDB_628
Number of amino acids:202
Molecular Weight:21462.75 Da
Theoretical pI:4.84


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)115.45%
Cysteine CYS (C)167.92%
Glutamic Acid GLU (E)31.49%
Aspartic Acid ASP (D)157.43%
Glycine GLY (G)2713.37%
Phynylalanine PHE (F)125.94%
Isoleucine ILE (I)41.98%
Histidine HIS (H)00%
Lysine LYS (K)62.97%
Methionine MET (M)10.5%
Leucine LEU (L)73.47%
Asparagine ASN (N)146.93%
Glutamine GLN (Q)73.47%
Proline PRO (P)157.43%
Serine SER (S)146.93%
Arginine ARG (R)94.46%
Threonine THR (T)178.42%
Tryptophan TRP (W)31.49%
Valine VAL (V)136.44%
Tyrosine TYR (Y)83.96%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC925
HydrogenH1385
NitrogenN259
OxygenO299
SulphurS17

FormulaC925H1385N259O299S17
Total Number of Atoms:2885


Total number of positively charged residues (ARG + LYS):15
Total number of negatively charged residues (ASP + GLU):18
Extinction Coefficient:Extinction coefficients are in units of M-1 cm-1, at 280 nm measured in water.

Ext. coefficient    29420
Absorption 0.1% (=1 g/l)    1.371,   assuming all pairs of CYS residues form cystines

Ext. coefficient    28420
Absorption 0.1% (=1 g/l)    1.324,   assuming all CYS residues are reduced
Aromaticity:0.114

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 25.96

This indicates that the protein/peptide is stable
Secondary Structure Fraction [Helix, Turn, Sheet]:[23.27, 34.65, 10.89]

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:45.3465
Grand average of hydropathicity (GRAVY):-0.38