Amino acid dipepetide frequency for Escherichia coli O157:H7

Apart from single amino acid frequencies one can also calculate so called amino acid dipeptide frequency.

There is 400 possibilites (441 if we consider Xaa as additional 21st amino acid representing all non-standard or unknown amino acids). Thus, if the dipeptides would be present randomly in proteins each amino acid dipeptide should be present with 0.25% frequency. As it is not the case in the nature, for better visablity all more than expected dipepetides are marked by red, and those which are underrepresented are marked by blue in the table.

All values are presented as per milles (‰), therefore need to be multiplied by 10-3.

For more information see sequence space article on Wikipedia.

AlaCysAspGluPheGlyHisIleLysLeuMetAsnProGlnArgSerThrValTrpTyrXaa
Ala
9.632AlaAla: 9.632 ± 0.115
1.115AlaCys: 1.115 ± 0.027
4.975AlaAsp: 4.975 ± 0.067
5.973AlaGlu: 5.973 ± 0.077
3.453AlaPhe: 3.453 ± 0.052
7.318AlaGly: 7.318 ± 0.088
1.746AlaHis: 1.746 ± 0.032
5.775AlaIle: 5.775 ± 0.062
4.022AlaLys: 4.022 ± 0.068
10.833AlaLeu: 10.833 ± 0.098
2.911AlaMet: 2.911 ± 0.048
3.213AlaAsn: 3.213 ± 0.054
3.43AlaPro: 3.43 ± 0.048
4.318AlaGln: 4.318 ± 0.053
5.284AlaArg: 5.284 ± 0.069
5.408AlaSer: 5.408 ± 0.084
4.845AlaThr: 4.845 ± 0.091
6.496AlaVal: 6.496 ± 0.079
1.567AlaTrp: 1.567 ± 0.035
2.002AlaTyr: 2.002 ± 0.034
0.0AlaXaa: 0.0 ± 0.0
Cys
0.993CysAla: 0.993 ± 0.027
0.211CysCys: 0.211 ± 0.013
0.635CysAsp: 0.635 ± 0.02
0.67CysGlu: 0.67 ± 0.021
0.466CysPhe: 0.466 ± 0.017
1.099CysGly: 1.099 ± 0.03
0.344CysHis: 0.344 ± 0.016
0.603CysIle: 0.603 ± 0.021
0.384CysLys: 0.384 ± 0.017
1.012CysLeu: 1.012 ± 0.031
0.254CysMet: 0.254 ± 0.013
0.369CysAsn: 0.369 ± 0.014
0.567CysPro: 0.567 ± 0.022
0.473CysGln: 0.473 ± 0.019
0.692CysArg: 0.692 ± 0.019
0.755CysSer: 0.755 ± 0.026
0.567CysThr: 0.567 ± 0.019
0.795CysVal: 0.795 ± 0.022
0.206CysTrp: 0.206 ± 0.012
0.373CysTyr: 0.373 ± 0.015
0.0CysXaa: 0.0 ± 0.0
Asp
5.056AspAla: 5.056 ± 0.07
0.578AspCys: 0.578 ± 0.022
3.033AspAsp: 3.033 ± 0.051
3.638AspGlu: 3.638 ± 0.052
2.085AspPhe: 2.085 ± 0.036
3.961AspGly: 3.961 ± 0.063
0.972AspHis: 0.972 ± 0.025
3.62AspIle: 3.62 ± 0.055
2.728AspLys: 2.728 ± 0.049
4.574AspLeu: 4.574 ± 0.063
1.318AspMet: 1.318 ± 0.027
2.432AspAsn: 2.432 ± 0.043
2.2AspPro: 2.2 ± 0.039
1.6AspGln: 1.6 ± 0.034
2.559AspArg: 2.559 ± 0.043
2.844AspSer: 2.844 ± 0.052
2.59AspThr: 2.59 ± 0.05
3.895AspVal: 3.895 ± 0.056
0.848AspTrp: 0.848 ± 0.025
1.884AspTyr: 1.884 ± 0.04
0.0AspXaa: 0.0 ± 0.0
Glu
5.221GluAla: 5.221 ± 0.061
0.567GluCys: 0.567 ± 0.019
2.499GluAsp: 2.499 ± 0.045
3.645GluGlu: 3.645 ± 0.066
1.893GluPhe: 1.893 ± 0.035
3.637GluGly: 3.637 ± 0.055
1.451GluHis: 1.451 ± 0.03
3.61GluIle: 3.61 ± 0.057
3.587GluLys: 3.587 ± 0.05
6.112GluLeu: 6.112 ± 0.076
1.883GluMet: 1.883 ± 0.035
2.656GluAsn: 2.656 ± 0.042
2.093GluPro: 2.093 ± 0.045
3.531GluGln: 3.531 ± 0.06
3.677GluArg: 3.677 ± 0.058
3.197GluSer: 3.197 ± 0.048
3.019GluThr: 3.019 ± 0.047
3.777GluVal: 3.777 ± 0.056
0.859GluTrp: 0.859 ± 0.023
1.647GluTyr: 1.647 ± 0.036
0.0GluXaa: 0.0 ± 0.0
Phe
3.563PheAla: 3.563 ± 0.054
0.562PheCys: 0.562 ± 0.018
2.278PheAsp: 2.278 ± 0.042
1.75PheGlu: 1.75 ± 0.036
1.665PhePhe: 1.665 ± 0.036
2.999PheGly: 2.999 ± 0.053
0.811PheHis: 0.811 ± 0.023
2.476PheIle: 2.476 ± 0.049
1.349PheLys: 1.349 ± 0.031
3.226PheLeu: 3.226 ± 0.047
1.002PheMet: 1.002 ± 0.026
1.801PheAsn: 1.801 ± 0.034
1.516PhePro: 1.516 ± 0.034
1.023PheGln: 1.023 ± 0.023
1.949PheArg: 1.949 ± 0.038
3.193PheSer: 3.193 ± 0.048
2.447PheThr: 2.447 ± 0.043
2.493PheVal: 2.493 ± 0.04
0.617PheTrp: 0.617 ± 0.021
1.219PheTyr: 1.219 ± 0.03
0.0PheXaa: 0.0 ± 0.0
Gly
6.045GlyAla: 6.045 ± 0.072
1.02GlyCys: 1.02 ± 0.03
3.786GlyAsp: 3.786 ± 0.066
4.694GlyGlu: 4.694 ± 0.062
3.098GlyPhe: 3.098 ± 0.049
5.387GlyGly: 5.387 ± 0.08
1.557GlyHis: 1.557 ± 0.032
4.995GlyIle: 4.995 ± 0.069
4.159GlyLys: 4.159 ± 0.055
7.034GlyLeu: 7.034 ± 0.078
2.353GlyMet: 2.353 ± 0.039
3.051GlyAsn: 3.051 ± 0.068
2.038GlyPro: 2.038 ± 0.054
2.887GlyGln: 2.887 ± 0.053
3.633GlyArg: 3.633 ± 0.06
4.16GlySer: 4.16 ± 0.065
3.83GlyThr: 3.83 ± 0.064
5.754GlyVal: 5.754 ± 0.069
1.301GlyTrp: 1.301 ± 0.032
2.602GlyTyr: 2.602 ± 0.04
0.0GlyXaa: 0.0 ± 0.0
His
1.829HisAla: 1.829 ± 0.039
0.327HisCys: 0.327 ± 0.015
1.167HisAsp: 1.167 ± 0.029
1.155HisGlu: 1.155 ± 0.028
0.989HisPhe: 0.989 ± 0.026
1.69HisGly: 1.69 ± 0.031
0.73HisHis: 0.73 ± 0.024
1.358HisIle: 1.358 ± 0.028
0.83HisLys: 0.83 ± 0.022
2.128HisLeu: 2.128 ± 0.036
0.521HisMet: 0.521 ± 0.019
0.907HisAsn: 0.907 ± 0.023
1.289HisPro: 1.289 ± 0.032
1.085HisGln: 1.085 ± 0.027
1.24HisArg: 1.24 ± 0.032
1.245HisSer: 1.245 ± 0.031
1.054HisThr: 1.054 ± 0.023
1.286HisVal: 1.286 ± 0.029
0.368HisTrp: 0.368 ± 0.015
0.904HisTyr: 0.904 ± 0.027
0.0HisXaa: 0.0 ± 0.0
Ile
6.223IleAla: 6.223 ± 0.071
0.774IleCys: 0.774 ± 0.023
3.558IleAsp: 3.558 ± 0.055
3.286IleGlu: 3.286 ± 0.056
2.13IlePhe: 2.13 ± 0.043
4.369IleGly: 4.369 ± 0.066
1.226IleHis: 1.226 ± 0.03
3.572IleIle: 3.572 ± 0.06
2.625IleLys: 2.625 ± 0.054
4.961IleLeu: 4.961 ± 0.072
1.301IleMet: 1.301 ± 0.031
3.004IleAsn: 3.004 ± 0.06
2.868IlePro: 2.868 ± 0.041
1.928IleGln: 1.928 ± 0.04
3.136IleArg: 3.136 ± 0.055
4.182IleSer: 4.182 ± 0.059
3.734IleThr: 3.734 ± 0.062
3.911IleVal: 3.911 ± 0.057
0.696IleTrp: 0.696 ± 0.022
1.593IleTyr: 1.593 ± 0.032
0.0IleXaa: 0.0 ± 0.0
Lys
4.315LysAla: 4.315 ± 0.072
0.348LysCys: 0.348 ± 0.017
2.242LysAsp: 2.242 ± 0.049
2.765LysGlu: 2.765 ± 0.048
1.251LysPhe: 1.251 ± 0.026
3.118LysGly: 3.118 ± 0.055
0.952LysHis: 0.952 ± 0.021
2.652LysIle: 2.652 ± 0.052
2.516LysLys: 2.516 ± 0.05
4.472LysLeu: 4.472 ± 0.062
1.366LysMet: 1.366 ± 0.033
2.095LysAsn: 2.095 ± 0.039
2.209LysPro: 2.209 ± 0.039
2.12LysGln: 2.12 ± 0.036
2.596LysArg: 2.596 ± 0.042
2.483LysSer: 2.483 ± 0.053
2.777LysThr: 2.777 ± 0.044
3.039LysVal: 3.039 ± 0.049
0.52LysTrp: 0.52 ± 0.019
1.274LysTyr: 1.274 ± 0.029
0.0LysXaa: 0.0 ± 0.0
Leu
10.795LeuAla: 10.795 ± 0.108
1.297LeuCys: 1.297 ± 0.031
5.137LeuAsp: 5.137 ± 0.063
5.382LeuGlu: 5.382 ± 0.071
4.002LeuPhe: 4.002 ± 0.058
6.765LeuGly: 6.765 ± 0.07
2.182LeuHis: 2.182 ± 0.038
5.679LeuIle: 5.679 ± 0.082
4.651LeuLys: 4.651 ± 0.067
11.145LeuLeu: 11.145 ± 0.121
2.888LeuMet: 2.888 ± 0.049
4.473LeuAsn: 4.473 ± 0.059
5.49LeuPro: 5.49 ± 0.064
4.043LeuGln: 4.043 ± 0.057
5.916LeuArg: 5.916 ± 0.07
6.881LeuSer: 6.881 ± 0.072
6.455LeuThr: 6.455 ± 0.081
6.775LeuVal: 6.775 ± 0.076
1.451LeuTrp: 1.451 ± 0.035
2.555LeuTyr: 2.555 ± 0.045
0.0LeuXaa: 0.0 ± 0.0
Met
2.852MetAla: 2.852 ± 0.049
0.211MetCys: 0.211 ± 0.011
1.171MetAsp: 1.171 ± 0.025
1.26MetGlu: 1.26 ± 0.029
0.879MetPhe: 0.879 ± 0.025
1.851MetGly: 1.851 ± 0.032
0.499MetHis: 0.499 ± 0.016
1.503MetIle: 1.503 ± 0.031
1.475MetLys: 1.475 ± 0.03
3.122MetLeu: 3.122 ± 0.048
0.918MetMet: 0.918 ± 0.026
1.163MetAsn: 1.163 ± 0.026
1.35MetPro: 1.35 ± 0.029
1.26MetGln: 1.26 ± 0.028
1.528MetArg: 1.528 ± 0.034
1.896MetSer: 1.896 ± 0.034
1.85MetThr: 1.85 ± 0.036
1.87MetVal: 1.87 ± 0.039
0.268MetTrp: 0.268 ± 0.014
0.543MetTyr: 0.543 ± 0.02
0.0MetXaa: 0.0 ± 0.0
Asn
3.85AsnAla: 3.85 ± 0.065
0.434AsnCys: 0.434 ± 0.019
2.183AsnAsp: 2.183 ± 0.043
2.227AsnGlu: 2.227 ± 0.041
1.425AsnPhe: 1.425 ± 0.037
3.456AsnGly: 3.456 ± 0.061
0.93AsnHis: 0.93 ± 0.027
2.663AsnIle: 2.663 ± 0.049
1.831AsnLys: 1.831 ± 0.035
3.605AsnLeu: 3.605 ± 0.048
0.989AsnMet: 0.989 ± 0.027
1.965AsnAsn: 1.965 ± 0.052
2.157AsnPro: 2.157 ± 0.036
1.683AsnGln: 1.683 ± 0.036
2.118AsnArg: 2.118 ± 0.043
2.317AsnSer: 2.317 ± 0.044
2.218AsnThr: 2.218 ± 0.051
2.758AsnVal: 2.758 ± 0.043
0.613AsnTrp: 0.613 ± 0.022
1.336AsnTyr: 1.336 ± 0.033
0.0AsnXaa: 0.0 ± 0.0
Pro
4.273ProAla: 4.273 ± 0.066
0.418ProCys: 0.418 ± 0.014
2.842ProAsp: 2.842 ± 0.049
3.606ProGlu: 3.606 ± 0.049
1.794ProPhe: 1.794 ± 0.037
3.414ProGly: 3.414 ± 0.051
0.977ProHis: 0.977 ± 0.028
1.812ProIle: 1.812 ± 0.04
1.608ProLys: 1.608 ± 0.037
4.86ProLeu: 4.86 ± 0.063
1.043ProMet: 1.043 ± 0.025
1.251ProAsn: 1.251 ± 0.028
1.701ProPro: 1.701 ± 0.041
2.259ProGln: 2.259 ± 0.049
1.945ProArg: 1.945 ± 0.041
2.198ProSer: 2.198 ± 0.041
2.073ProThr: 2.073 ± 0.033
3.879ProVal: 3.879 ± 0.049
0.718ProTrp: 0.718 ± 0.023
1.185ProTyr: 1.185 ± 0.027
0.0ProXaa: 0.0 ± 0.0
Gln
4.394GlnAla: 4.394 ± 0.061
0.403GlnCys: 0.403 ± 0.015
1.759GlnAsp: 1.759 ± 0.036
2.31GlnGlu: 2.31 ± 0.044
1.506GlnPhe: 1.506 ± 0.032
2.997GlnGly: 2.997 ± 0.048
1.204GlnHis: 1.204 ± 0.029
2.343GlnIle: 2.343 ± 0.037
2.014GlnLys: 2.014 ± 0.04
4.882GlnLeu: 4.882 ± 0.071
1.235GlnMet: 1.235 ± 0.025
1.657GlnAsn: 1.657 ± 0.039
2.14GlnPro: 2.14 ± 0.046
3.226GlnGln: 3.226 ± 0.064
2.913GlnArg: 2.913 ± 0.052
2.413GlnSer: 2.413 ± 0.042
2.262GlnThr: 2.262 ± 0.042
2.835GlnVal: 2.835 ± 0.049
0.71GlnTrp: 0.71 ± 0.024
1.292GlnTyr: 1.292 ± 0.031
0.0GlnXaa: 0.0 ± 0.0
Arg
4.335ArgAla: 4.335 ± 0.053
0.606ArgCys: 0.606 ± 0.02
3.081ArgAsp: 3.081 ± 0.05
3.989ArgGlu: 3.989 ± 0.057
2.401ArgPhe: 2.401 ± 0.041
3.393ArgGly: 3.393 ± 0.053
1.56ArgHis: 1.56 ± 0.035
3.304ArgIle: 3.304 ± 0.046
2.554ArgLys: 2.554 ± 0.051
6.05ArgLeu: 6.05 ± 0.079
1.574ArgMet: 1.574 ± 0.032
2.212ArgAsn: 2.212 ± 0.04
2.05ArgPro: 2.05 ± 0.04
2.988ArgGln: 2.988 ± 0.058
3.587ArgArg: 3.587 ± 0.048
2.718ArgSer: 2.718 ± 0.049
2.602ArgThr: 2.602 ± 0.048
3.728ArgVal: 3.728 ± 0.051
0.962ArgTrp: 0.962 ± 0.028
2.151ArgTyr: 2.151 ± 0.044
0.0ArgXaa: 0.0 ± 0.0
Ser
5.6SerAla: 5.6 ± 0.088
0.637SerCys: 0.637 ± 0.021
3.195SerAsp: 3.195 ± 0.045
3.371SerGlu: 3.371 ± 0.049
2.266SerPhe: 2.266 ± 0.042
5.438SerGly: 5.438 ± 0.077
1.332SerHis: 1.332 ± 0.029
3.093SerIle: 3.093 ± 0.049
2.201SerLys: 2.201 ± 0.043
6.613SerLeu: 6.613 ± 0.066
1.546SerMet: 1.546 ± 0.032
2.123SerAsn: 2.123 ± 0.045
2.568SerPro: 2.568 ± 0.044
2.648SerGln: 2.648 ± 0.046
3.52SerArg: 3.52 ± 0.051
3.751SerSer: 3.751 ± 0.064
3.079SerThr: 3.079 ± 0.055
4.363SerVal: 4.363 ± 0.064
0.994SerTrp: 0.994 ± 0.029
1.699SerTyr: 1.699 ± 0.034
0.0SerXaa: 0.0 ± 0.0
Thr
5.101ThrAla: 5.101 ± 0.088
0.558ThrCys: 0.558 ± 0.02
2.789ThrAsp: 2.789 ± 0.048
2.861ThrGlu: 2.861 ± 0.048
2.15ThrPhe: 2.15 ± 0.039
4.682ThrGly: 4.682 ± 0.066
1.234ThrHis: 1.234 ± 0.029
3.132ThrIle: 3.132 ± 0.061
1.674ThrLys: 1.674 ± 0.035
7.146ThrLeu: 7.146 ± 0.091
1.146ThrMet: 1.146 ± 0.03
1.723ThrAsn: 1.723 ± 0.044
3.197ThrPro: 3.197 ± 0.047
2.241ThrGln: 2.241 ± 0.042
2.94ThrArg: 2.94 ± 0.049
3.038ThrSer: 3.038 ± 0.056
3.15ThrThr: 3.15 ± 0.068
4.216ThrVal: 4.216 ± 0.112
0.87ThrTrp: 0.87 ± 0.024
1.294ThrTyr: 1.294 ± 0.035
0.0ThrXaa: 0.0 ± 0.0
Val
6.765ValAla: 6.765 ± 0.076
0.81ValCys: 0.81 ± 0.022
3.743ValAsp: 3.743 ± 0.053
3.98ValGlu: 3.98 ± 0.051
2.556ValPhe: 2.556 ± 0.041
4.664ValGly: 4.664 ± 0.062
1.222ValHis: 1.222 ± 0.028
4.606ValIle: 4.606 ± 0.069
3.266ValLys: 3.266 ± 0.046
6.966ValLeu: 6.966 ± 0.077
2.137ValMet: 2.137 ± 0.04
3.006ValAsn: 3.006 ± 0.047
2.999ValPro: 2.999 ± 0.044
2.371ValGln: 2.371 ± 0.047
3.62ValArg: 3.62 ± 0.056
4.589ValSer: 4.589 ± 0.052
4.397ValThr: 4.397 ± 0.099
5.506ValVal: 5.506 ± 0.069
0.976ValTrp: 0.976 ± 0.026
1.815ValTyr: 1.815 ± 0.037
0.0ValXaa: 0.0 ± 0.0
Trp
1.021TrpAla: 1.021 ± 0.025
0.208TrpCys: 0.208 ± 0.012
0.663TrpAsp: 0.663 ± 0.022
0.601TrpGlu: 0.601 ± 0.019
0.703TrpPhe: 0.703 ± 0.021
0.924TrpGly: 0.924 ± 0.027
0.444TrpHis: 0.444 ± 0.016
0.751TrpIle: 0.751 ± 0.023
0.571TrpLys: 0.571 ± 0.019
2.233TrpLeu: 2.233 ± 0.047
0.487TrpMet: 0.487 ± 0.02
0.511TrpAsn: 0.511 ± 0.019
0.654TrpPro: 0.654 ± 0.02
1.245TrpGln: 1.245 ± 0.03
1.124TrpArg: 1.124 ± 0.032
0.882TrpSer: 0.882 ± 0.033
0.6TrpThr: 0.6 ± 0.021
0.936TrpVal: 0.936 ± 0.022
0.254TrpTrp: 0.254 ± 0.015
0.44TrpTyr: 0.44 ± 0.016
0.0TrpXaa: 0.0 ± 0.0
Tyr
2.454TyrAla: 2.454 ± 0.036
0.385TyrCys: 0.385 ± 0.015
1.676TyrAsp: 1.676 ± 0.051
1.397TyrGlu: 1.397 ± 0.035
1.227TyrPhe: 1.227 ± 0.029
2.225TyrGly: 2.225 ± 0.044
0.73TyrHis: 0.73 ± 0.023
1.528TyrIle: 1.528 ± 0.038
1.065TyrLys: 1.065 ± 0.029
2.989TyrLeu: 2.989 ± 0.05
0.596TyrMet: 0.596 ± 0.018
1.146TyrAsn: 1.146 ± 0.032
1.34TyrPro: 1.34 ± 0.032
1.565TyrGln: 1.565 ± 0.033
1.868TyrArg: 1.868 ± 0.033
1.888TyrSer: 1.888 ± 0.037
1.592TyrThr: 1.592 ± 0.042
1.683TyrVal: 1.683 ± 0.032
0.455TyrTrp: 0.455 ± 0.019
1.004TyrTyr: 1.004 ± 0.031
0.0TyrXaa: 0.0 ± 0.0
Xaa
0.0XaaAla: 0.0 ± 0.0
0.0XaaCys: 0.0 ± 0.0
0.0XaaAsp: 0.0 ± 0.0
0.0XaaGlu: 0.0 ± 0.0
0.0XaaPhe: 0.0 ± 0.0
0.0XaaGly: 0.0 ± 0.0
0.0XaaHis: 0.0 ± 0.0
0.0XaaIle: 0.0 ± 0.0
0.0XaaLys: 0.0 ± 0.0
0.0XaaLeu: 0.0 ± 0.0
0.0XaaMet: 0.0 ± 0.0
0.0XaaAsn: 0.0 ± 0.0
0.0XaaPro: 0.0 ± 0.0
0.0XaaGln: 0.0 ± 0.0
0.0XaaArg: 0.0 ± 0.0
0.0XaaSer: 0.0 ± 0.0
0.0XaaThr: 0.0 ± 0.0
0.0XaaVal: 0.0 ± 0.0
0.0XaaTrp: 0.0 ± 0.0
0.0XaaTyr: 0.0 ± 0.0
0.0XaaXaa: 0.0 ± 0.0
Statistics based on 5064 proteins (1561664 amino acids)

Note: The error has been estimated with the bootstraping (x100) at the protein level

Above dipeptide statistics (among other stats for this proteome) you can download from this CSV file
See this proteome in: uniprot_link
Proteome-pI is available under Creative Commons Attribution-NoDerivs license, for more details see here

Reference: Kozlowski LP. Proteome-pI 2.0: Proteome Isoelectric Point Database Update. Nucleic Acids Res. 2021, doi: 10.1093/nar/gkab944 Contact: Lukasz P. Kozlowski