Physicochemical Properties of Peptide



PPepDB ID:PPepDB_5145
Number of amino acids:222
Molecular Weight:23884.39 Da
Theoretical pI:6.46


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)146.31%
Cysteine CYS (C)20.9%
Glutamic Acid GLU (E)52.25%
Aspartic Acid ASP (D)114.95%
Glycine GLY (G)177.66%
Phynylalanine PHE (F)198.56%
Isoleucine ILE (I)104.5%
Histidine HIS (H)41.8%
Lysine LYS (K)114.95%
Methionine MET (M)20.9%
Leucine LEU (L)209.01%
Asparagine ASN (N)146.31%
Glutamine GLN (Q)83.6%
Proline PRO (P)188.11%
Serine SER (S)188.11%
Arginine ARG (R)41.8%
Threonine THR (T)146.31%
Tryptophan TRP (W)00%
Valine VAL (V)2611.71%
Tyrosine TYR (Y)52.25%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC1097
HydrogenH1691
NitrogenN275
OxygenO314
SulphurS4

FormulaC1097H1691N275O314S4
Total Number of Atoms:3381


Total number of positively charged residues (ARG + LYS):15
Total number of negatively charged residues (ASP + GLU):16
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    7575
Absorption 0.1% (=1 g/l)    0.317,   assuming all pairs of CYS residues form cystines

Ext. coefficient    7450
Absorption 0.1% (=1 g/l)    0.312,   assuming all CYS residues are reduced
Aromaticity:0.108

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 14.59

This indicates that the protein/peptide is stable
Secondary Structure Fraction [Helix, Turn, Sheet]:[36.04, 30.18, 18.47]

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:92.9729
Grand average of hydropathicity (GRAVY):0.20