Physicochemical Properties of Peptide



PPepDB ID:PPepDB_2522
Number of amino acids:40
Molecular Weight:3837.27 Da
Theoretical pI:8.14


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)37.5%
Cysteine CYS (C)820%
Glutamic Acid GLU (E)00%
Aspartic Acid ASP (D)12.5%
Glycine GLY (G)1025%
Phynylalanine PHE (F)12.5%
Isoleucine ILE (I)00%
Histidine HIS (H)00%
Lysine LYS (K)12.5%
Methionine MET (M)00%
Leucine LEU (L)00%
Asparagine ASN (N)12.5%
Glutamine GLN (Q)37.5%
Proline PRO (P)12.5%
Serine SER (S)512.5%
Arginine ARG (R)25%
Threonine THR (T)12.5%
Tryptophan TRP (W)00%
Valine VAL (V)12.5%
Tyrosine TYR (Y)12.5%


Atomic Composition:


As there is at least one ambiguous position (B, J, X or Z) in the sequence considered, the atomic composition cannot be computed.


Total number of positively charged residues (ARG + LYS):3
Total number of negatively charged residues (ASP + GLU):1
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    1990
Absorption 0.1% (=1 g/l)    0.519,   assuming all pairs of CYS residues form cystines

Ext. coefficient    1490
Absorption 0.1% (=1 g/l)    0.388,   assuming all CYS residues are reduced
Aromaticity:0.050

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 44.01

This indicates that the protein/peptide is unstable
Secondary Structure Fraction [Helix, Turn, Sheet]:[7.50, 42.50, 7.50]

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:14.75
Grand average of hydropathicity (GRAVY):0.00