Physicochemical Properties of Peptide



PPepDB ID:PPepDB_4833
Number of amino acids:107
Molecular Weight:11895.16 Da
Theoretical pI:7.1


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)43.74%
Cysteine CYS (C)1211.22%
Glutamic Acid GLU (E)43.74%
Aspartic Acid ASP (D)98.41%
Glycine GLY (G)65.61%
Phynylalanine PHE (F)54.67%
Isoleucine ILE (I)76.54%
Histidine HIS (H)65.61%
Lysine LYS (K)1110.28%
Methionine MET (M)65.61%
Leucine LEU (L)87.48%
Asparagine ASN (N)32.8%
Glutamine GLN (Q)00%
Proline PRO (P)54.67%
Serine SER (S)76.54%
Arginine ARG (R)21.87%
Threonine THR (T)21.87%
Tryptophan TRP (W)00%
Valine VAL (V)98.41%
Tyrosine TYR (Y)10.93%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC515
HydrogenH827
NitrogenN139
OxygenO147
SulphurS18

FormulaC515H827N139O147S18
Total Number of Atoms:1646


Total number of positively charged residues (ARG + LYS):13
Total number of negatively charged residues (ASP + GLU):13
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    2240
Absorption 0.1% (=1 g/l)    0.188,   assuming all pairs of CYS residues form cystines

Ext. coefficient    1490
Absorption 0.1% (=1 g/l)    0.125,   assuming all CYS residues are reduced
Aromaticity:0.056

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 39.99

This indicates that the protein/peptide is stable
Secondary Structure Fraction [Helix, Turn, Sheet]:[28.04, 19.63, 20.56]

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:82.8038
Grand average of hydropathicity (GRAVY):0.15