Physicochemical Properties of Peptide



PPepDB ID:PPepDB_6000
Number of amino acids:99
Molecular Weight:10255 Da
Theoretical pI:6.49


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)1313.13%
Cysteine CYS (C)99.09%
Glutamic Acid GLU (E)22.02%
Aspartic Acid ASP (D)22.02%
Glycine GLY (G)33.03%
Phynylalanine PHE (F)11.01%
Isoleucine ILE (I)33.03%
Histidine HIS (H)11.01%
Lysine LYS (K)22.02%
Methionine MET (M)33.03%
Leucine LEU (L)1313.13%
Asparagine ASN (N)55.05%
Glutamine GLN (Q)66.06%
Proline PRO (P)66.06%
Serine SER (S)1111.11%
Arginine ARG (R)22.02%
Threonine THR (T)88.08%
Tryptophan TRP (W)11.01%
Valine VAL (V)88.08%
Tyrosine TYR (Y)00%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC436
HydrogenH725
NitrogenN121
OxygenO138
SulphurS12

FormulaC436H725N121O138S12
Total Number of Atoms:1432


Total number of positively charged residues (ARG + LYS):4
Total number of negatively charged residues (ASP + GLU):4
Extinction Coefficient:Extinction coefficients are in units of M-1 cm-1, at 280 nm measured in water.

Ext. coefficient    6000
Absorption 0.1% (=1 g/l)    0.585,   assuming all pairs of CYS residues form cystines

Ext. coefficient    5500
Absorption 0.1% (=1 g/l)    0.536,   assuming all CYS residues are reduced
Aromaticity:0.020

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 61.04

This indicates that the protein/peptide is unstable
Secondary Structure Fraction [Helix, Turn, Sheet]:[26.26, 25.25, 31.31]

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:99.5959
Grand average of hydropathicity (GRAVY):0.53