Physicochemical Properties of Peptide



PPepDB ID:PPepDB_1419
Number of amino acids:127
Molecular Weight:13596.81 Da
Theoretical pI:6.19


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)107.87%
Cysteine CYS (C)1511.81%
Glutamic Acid GLU (E)64.72%
Aspartic Acid ASP (D)75.51%
Glycine GLY (G)118.66%
Phynylalanine PHE (F)21.57%
Isoleucine ILE (I)10.79%
Histidine HIS (H)00%
Lysine LYS (K)75.51%
Methionine MET (M)43.15%
Leucine LEU (L)1612.6%
Asparagine ASN (N)86.3%
Glutamine GLN (Q)32.36%
Proline PRO (P)32.36%
Serine SER (S)86.3%
Arginine ARG (R)64.72%
Threonine THR (T)64.72%
Tryptophan TRP (W)00%
Valine VAL (V)107.87%
Tyrosine TYR (Y)43.15%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC569
HydrogenH935
NitrogenN163
OxygenO183
SulphurS19

FormulaC569H935N163O183S19
Total Number of Atoms:1869


Total number of positively charged residues (ARG + LYS):13
Total number of negatively charged residues (ASP + GLU):13
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    6835
Absorption 0.1% (=1 g/l)    0.503,   assuming all pairs of CYS residues form cystines

Ext. coefficient    5960
Absorption 0.1% (=1 g/l)    0.438,   assuming all CYS residues are reduced
Aromaticity:0.047

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 25.25

This indicates that the protein/peptide is stable
Secondary Structure Fraction [Helix, Turn, Sheet]:[25.98, 23.62, 28.35]

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:82.9133
Grand average of hydropathicity (GRAVY):0.10