Physicochemical Properties of Peptide



PPepDB ID:PPepDB_843
Number of amino acids:78
Molecular Weight:8464.88 Da
Theoretical pI:7.58


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)45.13%
Cysteine CYS (C)67.69%
Glutamic Acid GLU (E)33.85%
Aspartic Acid ASP (D)22.56%
Glycine GLY (G)45.13%
Phynylalanine PHE (F)33.85%
Isoleucine ILE (I)33.85%
Histidine HIS (H)11.28%
Lysine LYS (K)33.85%
Methionine MET (M)45.13%
Leucine LEU (L)911.54%
Asparagine ASN (N)67.69%
Glutamine GLN (Q)11.28%
Proline PRO (P)45.13%
Serine SER (S)1114.1%
Arginine ARG (R)33.85%
Threonine THR (T)33.85%
Tryptophan TRP (W)00%
Valine VAL (V)67.69%
Tyrosine TYR (Y)22.56%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC364
HydrogenH589
NitrogenN99
OxygenO112
SulphurS10

FormulaC364H589N99O112S10
Total Number of Atoms:1174


Total number of positively charged residues (ARG + LYS):6
Total number of negatively charged residues (ASP + GLU):5
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    3355
Absorption 0.1% (=1 g/l)    0.396,   assuming all pairs of CYS residues form cystines

Ext. coefficient    2980
Absorption 0.1% (=1 g/l)    0.352,   assuming all CYS residues are reduced
Aromaticity:0.064

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 36.10

This indicates that the protein/peptide is stable
Secondary Structure Fraction [Helix, Turn, Sheet]:[29.49, 32.05, 25.64]

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:87.436
Grand average of hydropathicity (GRAVY):0.25