Physicochemical Properties of Peptide



PPepDB ID:PPepDB_2227
Number of amino acids:83
Molecular Weight:8835.39 Da
Theoretical pI:8.88


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)56.02%
Cysteine CYS (C)89.64%
Glutamic Acid GLU (E)33.61%
Aspartic Acid ASP (D)22.41%
Glycine GLY (G)89.64%
Phynylalanine PHE (F)44.82%
Isoleucine ILE (I)33.61%
Histidine HIS (H)11.2%
Lysine LYS (K)78.43%
Methionine MET (M)33.61%
Leucine LEU (L)78.43%
Asparagine ASN (N)44.82%
Glutamine GLN (Q)22.41%
Proline PRO (P)44.82%
Serine SER (S)910.84%
Arginine ARG (R)33.61%
Threonine THR (T)33.61%
Tryptophan TRP (W)00%
Valine VAL (V)67.23%
Tyrosine TYR (Y)11.2%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC379
HydrogenH619
NitrogenN107
OxygenO113
SulphurS11

FormulaC379H619N107O113S11
Total Number of Atoms:1229


Total number of positively charged residues (ARG + LYS):10
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    1990
Absorption 0.1% (=1 g/l)    0.225,   assuming all pairs of CYS residues form cystines

Ext. coefficient    1490
Absorption 0.1% (=1 g/l)    0.169,   assuming all CYS residues are reduced
Aromaticity:0.060

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 20.67

This indicates that the protein/peptide is stable
Secondary Structure Fraction [Helix, Turn, Sheet]:[25.30, 30.12, 21.69]

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:73.9759
Grand average of hydropathicity (GRAVY):0.10