Physicochemical Properties of Peptide



PPepDB ID:PPepDB_5294
Number of amino acids:82
Molecular Weight:8817.35 Da
Theoretical pI:8.2


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)33.66%
Cysteine CYS (C)89.76%
Glutamic Acid GLU (E)44.88%
Aspartic Acid ASP (D)11.22%
Glycine GLY (G)67.32%
Phynylalanine PHE (F)44.88%
Isoleucine ILE (I)33.66%
Histidine HIS (H)00%
Lysine LYS (K)78.54%
Methionine MET (M)56.1%
Leucine LEU (L)67.32%
Asparagine ASN (N)67.32%
Glutamine GLN (Q)22.44%
Proline PRO (P)44.88%
Serine SER (S)1012.2%
Arginine ARG (R)00%
Threonine THR (T)56.1%
Tryptophan TRP (W)00%
Valine VAL (V)67.32%
Tyrosine TYR (Y)22.44%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC378
HydrogenH609
NitrogenN97
OxygenO118
SulphurS13

FormulaC378H609N97O118S13
Total Number of Atoms:1215


Total number of positively charged residues (ARG + LYS):7
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    3480
Absorption 0.1% (=1 g/l)    0.395,   assuming all pairs of CYS residues form cystines

Ext. coefficient    2980
Absorption 0.1% (=1 g/l)    0.338,   assuming all CYS residues are reduced
Aromaticity:0.073

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 43.97

This indicates that the protein/peptide is unstable
Secondary Structure Fraction [Helix, Turn, Sheet]:[25.61, 31.71, 21.95]

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:67.6829
Grand average of hydropathicity (GRAVY):0.14