SIR1/YKR101W 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] 29 4.4%
Arg[R] 39 6.0%
Asn[N] 35 5.4%
Asp[D] 40 6.1%
Cys[C] 12 1.8%
Gln[Q] 27 4.1%
Glu[E] 47 7.2%
Gly[G] 15 2.3%
His[H] 9 1.4%
Ile[I] 44 6.7%
Leu[L] 77 11.8%
Lys[K] 67 10.2%
Met[M] 15 2.3%
Phe[F] 29 4.4%
Pro[P] 25 3.8%
Ser[S] 38 5.8%
Thr[T] 30 4.6%
Trp[W] 8 1.2%
Tyr[Y] 28 4.3%
Val[V] 40 6.1%
Total Length 654

Instability index
Instability index (II) 42.29
This classifies the protein as unstable

Atomic composition
Carbon 3474
Hydrogen 5536
Nitrogen 926
Oxygen 987
Sulfur 27
Total number of atoms 10950
Formula = C3474H5536N926O987S27

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 86470 M-1 cm-1
assuming NO Cys residues appear as half cystines 85720 M-1 cm-1
assuming all Cys residues are reduced 85720 M-1 cm-1
assuming all pairs of Cys residues form cystines 86470 M-1 cm-1

Aliphatic index
Aliphatic index 94.33

Coding Region Translation Calculations
Codon Bias -0.072
Codon Adaptation Index 0.106
Frequency of Optimal Codons 0.371
Hydropathicity of Protein -0.424
Aromaticity Score 0.099