ISA1/YLL027W Additional Physico-chemical Properties Help

Physico-chemical properties were determined using the ProtParam tool available through ExPASy to analyze the primary protein sequence for atomic composition, extinction coefficient, estimated half-life, instability index and aliphatic index. Transcript translation calculations were determined using CodonW.


A.A. Composition
Ala[A] 18 7.2%
Arg[R] 15 6.0%
Asn[N] 12 4.8%
Asp[D] 11 4.4%
Cys[C] 5 2.0%
Gln[Q] 7 2.8%
Glu[E] 11 4.4%
Gly[G] 15 6.0%
His[H] 3 1.2%
Ile[I] 17 6.8%
Leu[L] 15 6.0%
Lys[K] 30 12.0%
Met[M] 4 1.6%
Phe[F] 12 4.8%
Pro[P] 16 6.4%
Ser[S] 28 11.2%
Thr[T] 12 4.8%
Trp[W] 3 1.2%
Tyr[Y] 3 1.2%
Val[V] 13 5.2%
Total Length 250

Instability index
Instability index (II) 45.40
This classifies the protein as unstable

Atomic composition
Carbon 1226
Hydrogen 1989
Nitrogen 353
Oxygen 357
Sulfur 9
Total number of atoms 3934
Formula = C1226H1989N353O357S9

Estimated half-life
Escherichia coli (in vivo) >10 hours
mammalian reticulocytes (in vitro) 30 hours
yeast (in vivo) >20 hours

Extinction Coefficients at 280 nm
assuming ALL Cys residues appear as half cystines 21220 M-1 cm-1
assuming NO Cys residues appear as half cystines 20970 M-1 cm-1
assuming all Cys residues are reduced 20970 M-1 cm-1
assuming all pairs of Cys residues form cystines 21220 M-1 cm-1

Aliphatic index
Aliphatic index 72.20

Coding Region Translation Calculations
Codon Bias 0.086
Codon Adaptation Index 0.113
Frequency of Optimal Codons 0.453
Hydropathicity of Protein -0.530
Aromaticity Score 0.072