Physicochemical Properties of Peptide



PPepDB ID:PPepDB_264
Number of amino acids:93
Molecular Weight:10128.29 Da
Theoretical pI:4.48


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)88.6%
Cysteine CYS (C)33.23%
Glutamic Acid GLU (E)1212.9%
Aspartic Acid ASP (D)88.6%
Glycine GLY (G)1111.83%
Phynylalanine PHE (F)44.3%
Isoleucine ILE (I)77.53%
Histidine HIS (H)11.08%
Lysine LYS (K)77.53%
Methionine MET (M)22.15%
Leucine LEU (L)33.23%
Asparagine ASN (N)33.23%
Glutamine GLN (Q)00%
Proline PRO (P)55.38%
Serine SER (S)22.15%
Arginine ARG (R)44.3%
Threonine THR (T)55.38%
Tryptophan TRP (W)00%
Valine VAL (V)55.38%
Tyrosine TYR (Y)33.23%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC440
HydrogenH687
NitrogenN117
OxygenO147
SulphurS5

FormulaC440H687N117O147S5
Total Number of Atoms:1396


Total number of positively charged residues (ARG + LYS):11
Total number of negatively charged residues (ASP + GLU):20
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    4595
Absorption 0.1% (=1 g/l)    0.454,   assuming all pairs of CYS residues form cystines

Ext. coefficient    4470
Absorption 0.1% (=1 g/l)    0.441,   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 : 45.27

This indicates that the protein/peptide is unstable
Secondary Structure Fraction [Helix, Turn, Sheet]:[23.66, 22.58, 26.88]

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:66.129
Grand average of hydropathicity (GRAVY):-0.53