Physicochemical Properties of Peptide



PPepDB ID:PPepDB_791
Number of amino acids:249
Molecular Weight:26787.75 Da
Theoretical pI:9.06


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)249.64%
Cysteine CYS (C)166.43%
Glutamic Acid GLU (E)10.4%
Aspartic Acid ASP (D)104.02%
Glycine GLY (G)249.64%
Phynylalanine PHE (F)176.83%
Isoleucine ILE (I)93.61%
Histidine HIS (H)62.41%
Lysine LYS (K)124.82%
Methionine MET (M)31.2%
Leucine LEU (L)145.62%
Asparagine ASN (N)93.61%
Glutamine GLN (Q)52.01%
Proline PRO (P)218.43%
Serine SER (S)197.63%
Arginine ARG (R)114.42%
Threonine THR (T)197.63%
Tryptophan TRP (W)31.2%
Valine VAL (V)145.62%
Tyrosine TYR (Y)124.82%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC1203
HydrogenH1815
NitrogenN323
OxygenO336
SulphurS19

FormulaC1203H1815N323O336S19
Total Number of Atoms:3696


Total number of positively charged residues (ARG + LYS):23
Total number of negatively charged residues (ASP + GLU):11
Extinction Coefficient:Extinction coefficients are in units of M-1 cm-1, at 280 nm measured in water.

Ext. coefficient    35380
Absorption 0.1% (=1 g/l)    1.321,   assuming all pairs of CYS residues form cystines

Ext. coefficient    34380
Absorption 0.1% (=1 g/l)    1.283,   assuming all CYS residues are reduced
Aromaticity:0.129

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 46.28

This indicates that the protein/peptide is unstable
Secondary Structure Fraction [Helix, Turn, Sheet]:[27.71, 29.32, 16.87]

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:61.9679
Grand average of hydropathicity (GRAVY):-0.02