Physicochemical Properties of Peptide



PPepDB ID:PPepDB_5494
Number of amino acids:84
Molecular Weight:9529.39 Da
Theoretical pI:9.13


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)22.38%
Cysteine CYS (C)89.52%
Glutamic Acid GLU (E)55.95%
Aspartic Acid ASP (D)00%
Glycine GLY (G)67.14%
Phynylalanine PHE (F)89.52%
Isoleucine ILE (I)33.57%
Histidine HIS (H)00%
Lysine LYS (K)910.71%
Methionine MET (M)22.38%
Leucine LEU (L)910.71%
Asparagine ASN (N)22.38%
Glutamine GLN (Q)44.76%
Proline PRO (P)67.14%
Serine SER (S)67.14%
Arginine ARG (R)33.57%
Threonine THR (T)44.76%
Tryptophan TRP (W)00%
Valine VAL (V)44.76%
Tyrosine TYR (Y)33.57%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC432
HydrogenH678
NitrogenN108
OxygenO114
SulphurS10

FormulaC432H678N108O114S10
Total Number of Atoms:1342


Total number of positively charged residues (ARG + LYS):12
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    4970
Absorption 0.1% (=1 g/l)    0.522,   assuming all pairs of CYS residues form cystines

Ext. coefficient    4470
Absorption 0.1% (=1 g/l)    0.469,   assuming all CYS residues are reduced
Aromaticity:0.131

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 43.10

This indicates that the protein/peptide is unstable
Secondary Structure Fraction [Helix, Turn, Sheet]:[32.14, 23.81, 21.43]

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:71.9048
Grand average of hydropathicity (GRAVY):0.04