Physicochemical Properties of Peptide



PPepDB ID:PPepDB_4993
Number of amino acids:298
Molecular Weight:31603.1 Da
Theoretical pI:7.93


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)268.72%
Cysteine CYS (C)144.7%
Glutamic Acid GLU (E)62.01%
Aspartic Acid ASP (D)155.03%
Glycine GLY (G)3311.07%
Phynylalanine PHE (F)186.04%
Isoleucine ILE (I)165.37%
Histidine HIS (H)31.01%
Lysine LYS (K)124.03%
Methionine MET (M)62.01%
Leucine LEU (L)3010.07%
Asparagine ASN (N)124.03%
Glutamine GLN (Q)103.36%
Proline PRO (P)62.01%
Serine SER (S)3110.4%
Arginine ARG (R)113.69%
Threonine THR (T)217.05%
Tryptophan TRP (W)00%
Valine VAL (V)165.37%
Tyrosine TYR (Y)124.03%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC1393
HydrogenH2185
NitrogenN371
OxygenO427
SulphurS20

FormulaC1393H2185N371O427S20
Total Number of Atoms:4396


Total number of positively charged residues (ARG + LYS):23
Total number of negatively charged residues (ASP + GLU):21
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    18755
Absorption 0.1% (=1 g/l)    0.593,   assuming all pairs of CYS residues form cystines

Ext. coefficient    17880
Absorption 0.1% (=1 g/l)    0.566,   assuming all CYS residues are reduced
Aromaticity:0.101

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 37.85

This indicates that the protein/peptide is stable
Secondary Structure Fraction [Helix, Turn, Sheet]:[30.87, 27.52, 22.82]

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:84.4966
Grand average of hydropathicity (GRAVY):0.21