Physicochemical Properties of Peptide



PPepDB ID:PPepDB_724
Number of amino acids:130
Molecular Weight:13453.47 Da
Theoretical pI:7.57


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)1310%
Cysteine CYS (C)129.23%
Glutamic Acid GLU (E)53.85%
Aspartic Acid ASP (D)32.31%
Glycine GLY (G)75.38%
Phynylalanine PHE (F)10.77%
Isoleucine ILE (I)75.38%
Histidine HIS (H)00%
Lysine LYS (K)64.62%
Methionine MET (M)10.77%
Leucine LEU (L)107.69%
Asparagine ASN (N)118.46%
Glutamine GLN (Q)43.08%
Proline PRO (P)64.62%
Serine SER (S)1511.54%
Arginine ARG (R)32.31%
Threonine THR (T)96.92%
Tryptophan TRP (W)00%
Valine VAL (V)1410.77%
Tyrosine TYR (Y)32.31%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC568
HydrogenH942
NitrogenN160
OxygenO189
SulphurS13

FormulaC568H942N160O189S13
Total Number of Atoms:1872


Total number of positively charged residues (ARG + LYS):9
Total number of negatively charged residues (ASP + GLU):8
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    5220
Absorption 0.1% (=1 g/l)    0.388,   assuming all pairs of CYS residues form cystines

Ext. coefficient    4470
Absorption 0.1% (=1 g/l)    0.332,   assuming all CYS residues are reduced
Aromaticity:0.031

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 32.54

This indicates that the protein/peptide is stable
Secondary Structure Fraction [Helix, Turn, Sheet]:[26.92, 30.00, 22.31]

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:92.2307
Grand average of hydropathicity (GRAVY):0.27