Physicochemical Properties of Peptide



PPepDB ID:PPepDB_2526
Number of amino acids:39
Molecular Weight:4068.66 Da
Theoretical pI:8.93


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)25.13%
Cysteine CYS (C)820.51%
Glutamic Acid GLU (E)00%
Aspartic Acid ASP (D)00%
Glycine GLY (G)820.51%
Phynylalanine PHE (F)00%
Isoleucine ILE (I)00%
Histidine HIS (H)00%
Lysine LYS (K)12.56%
Methionine MET (M)00%
Leucine LEU (L)12.56%
Asparagine ASN (N)00%
Glutamine GLN (Q)410.26%
Proline PRO (P)12.56%
Serine SER (S)410.26%
Arginine ARG (R)410.26%
Threonine THR (T)12.56%
Tryptophan TRP (W)00%
Valine VAL (V)12.56%
Tyrosine TYR (Y)37.69%


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):5
Total number of negatively charged residues (ASP + GLU):0
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    4970
Absorption 0.1% (=1 g/l)    1.222,   assuming all pairs of CYS residues form cystines

Ext. coefficient    4470
Absorption 0.1% (=1 g/l)    1.099,   assuming all CYS residues are reduced
Aromaticity:0.077

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 38.51

This indicates that the protein/peptide is stable
Secondary Structure Fraction [Helix, Turn, Sheet]:[12.82, 33.33, 7.69]

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:22.5641
Grand average of hydropathicity (GRAVY):0.00