Physicochemical Properties of Peptide



PPepDB ID:PPepDB_5634
Number of amino acids:261
Molecular Weight:27748.18 Da
Theoretical pI:7.62


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)2710.34%
Cysteine CYS (C)103.83%
Glutamic Acid GLU (E)31.15%
Aspartic Acid ASP (D)114.21%
Glycine GLY (G)3212.26%
Phynylalanine PHE (F)145.36%
Isoleucine ILE (I)83.07%
Histidine HIS (H)10.38%
Lysine LYS (K)51.92%
Methionine MET (M)72.68%
Leucine LEU (L)176.51%
Asparagine ASN (N)134.98%
Glutamine GLN (Q)124.6%
Proline PRO (P)93.45%
Serine SER (S)269.96%
Arginine ARG (R)103.83%
Threonine THR (T)218.05%
Tryptophan TRP (W)83.07%
Valine VAL (V)166.13%
Tyrosine TYR (Y)114.21%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC1227
HydrogenH1847
NitrogenN331
OxygenO373
SulphurS17

FormulaC1227H1847N331O373S17
Total Number of Atoms:3795


Total number of positively charged residues (ARG + LYS):15
Total number of negatively charged residues (ASP + GLU):14
Extinction Coefficient:Extinction coefficients are in units of M-1 cm-1, at 280 nm measured in water.

Ext. coefficient    61015
Absorption 0.1% (=1 g/l)    2.199,   assuming all pairs of CYS residues form cystines

Ext. coefficient    60390
Absorption 0.1% (=1 g/l)    2.176,   assuming all CYS residues are reduced
Aromaticity:0.126

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 38.30

This indicates that the protein/peptide is stable
Secondary Structure Fraction [Helix, Turn, Sheet]:[28.35, 30.65, 20.69]

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:65.4789
Grand average of hydropathicity (GRAVY):0.02