Physicochemical Properties of Peptide



PPepDB ID:PPepDB_5507
Number of amino acids:186
Molecular Weight:20419 Da
Theoretical pI:9.26


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)2915.59%
Cysteine CYS (C)31.61%
Glutamic Acid GLU (E)10.54%
Aspartic Acid ASP (D)00%
Glycine GLY (G)21.08%
Phynylalanine PHE (F)84.3%
Isoleucine ILE (I)105.38%
Histidine HIS (H)31.61%
Lysine LYS (K)10.54%
Methionine MET (M)31.61%
Leucine LEU (L)3820.43%
Asparagine ASN (N)84.3%
Glutamine GLN (Q)3418.28%
Proline PRO (P)158.06%
Serine SER (S)147.53%
Arginine ARG (R)42.15%
Threonine THR (T)10.54%
Tryptophan TRP (W)00%
Valine VAL (V)63.23%
Tyrosine TYR (Y)63.23%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC935
HydrogenH1493
NitrogenN247
OxygenO252
SulphurS6

FormulaC935H1493N247O252S6
Total Number of Atoms:2933


Total number of positively charged residues (ARG + LYS):5
Total number of negatively charged residues (ASP + GLU):1
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    9065
Absorption 0.1% (=1 g/l)    0.444,   assuming all pairs of CYS residues form cystines

Ext. coefficient    8940
Absorption 0.1% (=1 g/l)    0.438,   assuming all CYS residues are reduced
Aromaticity:0.075

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 70.50

This indicates that the protein/peptide is unstable
Secondary Structure Fraction [Helix, Turn, Sheet]:[36.56, 20.97, 38.17]

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:125.591
Grand average of hydropathicity (GRAVY):0.41