Physicochemical Properties of Peptide



PPepDB ID:PPepDB_2528
Number of amino acids:37
Molecular Weight:4025.6 Da
Theoretical pI:8.64


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)00%
Cysteine CYS (C)616.22%
Glutamic Acid GLU (E)12.7%
Aspartic Acid ASP (D)00%
Glycine GLY (G)718.92%
Phynylalanine PHE (F)12.7%
Isoleucine ILE (I)12.7%
Histidine HIS (H)00%
Lysine LYS (K)12.7%
Methionine MET (M)00%
Leucine LEU (L)12.7%
Asparagine ASN (N)410.81%
Glutamine GLN (Q)25.41%
Proline PRO (P)410.81%
Serine SER (S)12.7%
Arginine ARG (R)38.11%
Threonine THR (T)00%
Tryptophan TRP (W)00%
Valine VAL (V)12.7%
Tyrosine TYR (Y)38.11%


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):4
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    4845
Absorption 0.1% (=1 g/l)    1.204,   assuming all pairs of CYS residues form cystines

Ext. coefficient    4470
Absorption 0.1% (=1 g/l)    1.110,   assuming all CYS residues are reduced
Aromaticity:0.108

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 32.08

This indicates that the protein/peptide is stable
Secondary Structure Fraction [Helix, Turn, Sheet]:[18.92, 43.24, 5.41]

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:28.9189
Grand average of hydropathicity (GRAVY):0.00