Physicochemical Properties of Peptide



PPepDB ID:PPepDB_3930
Number of amino acids:91
Molecular Weight:9298.73 Da
Theoretical pI:9.25


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)99.89%
Cysteine CYS (C)88.79%
Glutamic Acid GLU (E)11.1%
Aspartic Acid ASP (D)11.1%
Glycine GLY (G)1010.99%
Phynylalanine PHE (F)11.1%
Isoleucine ILE (I)66.59%
Histidine HIS (H)00%
Lysine LYS (K)55.49%
Methionine MET (M)11.1%
Leucine LEU (L)55.49%
Asparagine ASN (N)1010.99%
Glutamine GLN (Q)44.4%
Proline PRO (P)55.49%
Serine SER (S)77.69%
Arginine ARG (R)44.4%
Threonine THR (T)66.59%
Tryptophan TRP (W)00%
Valine VAL (V)77.69%
Tyrosine TYR (Y)11.1%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC388
HydrogenH652
NitrogenN122
OxygenO124
SulphurS9

FormulaC388H652N122O124S9
Total Number of Atoms:1295


Total number of positively charged residues (ARG + LYS):9
Total number of negatively charged residues (ASP + GLU):2
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    1990
Absorption 0.1% (=1 g/l)    0.214,   assuming all pairs of CYS residues form cystines

Ext. coefficient    1490
Absorption 0.1% (=1 g/l)    0.160,   assuming all CYS residues are reduced
Aromaticity:0.022

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 43.41

This indicates that the protein/peptide is unstable
Secondary Structure Fraction [Helix, Turn, Sheet]:[21.98, 35.16, 17.58]

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:79.3407
Grand average of hydropathicity (GRAVY):-0.00