Physicochemical Properties of Peptide



PPepDB ID:PPepDB_3879
Number of amino acids:90
Molecular Weight:8929.25 Da
Theoretical pI:9.22


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)1617.78%
Cysteine CYS (C)88.89%
Glutamic Acid GLU (E)00%
Aspartic Acid ASP (D)33.33%
Glycine GLY (G)88.89%
Phynylalanine PHE (F)00%
Isoleucine ILE (I)88.89%
Histidine HIS (H)00%
Lysine LYS (K)55.56%
Methionine MET (M)00%
Leucine LEU (L)22.22%
Asparagine ASN (N)55.56%
Glutamine GLN (Q)22.22%
Proline PRO (P)66.67%
Serine SER (S)1112.22%
Arginine ARG (R)55.56%
Threonine THR (T)44.44%
Tryptophan TRP (W)00%
Valine VAL (V)55.56%
Tyrosine TYR (Y)22.22%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC372
HydrogenH625
NitrogenN117
OxygenO121
SulphurS8

FormulaC372H625N117O121S8
Total Number of Atoms:1243


Total number of positively charged residues (ARG + LYS):10
Total number of negatively charged residues (ASP + GLU):3
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)    0.390,   assuming all pairs of CYS residues form cystines

Ext. coefficient    2980
Absorption 0.1% (=1 g/l)    0.334,   assuming all CYS residues are reduced
Aromaticity:0.022

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 39.17

This indicates that the protein/peptide is stable
Secondary Structure Fraction [Helix, Turn, Sheet]:[18.89, 33.33, 20.00]

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:77.2223
Grand average of hydropathicity (GRAVY):0.10