Amino acid dipepetide frequency for Firmicutes bacterium R50

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
24.43AlaAla: 24.43 ± 0.322
0.857AlaCys: 0.857 ± 0.038
5.932AlaAsp: 5.932 ± 0.1
7.486AlaGlu: 7.486 ± 0.124
3.76AlaPhe: 3.76 ± 0.079
16.518AlaGly: 16.518 ± 0.22
2.26AlaHis: 2.26 ± 0.056
3.939AlaIle: 3.939 ± 0.07
1.639AlaLys: 1.639 ± 0.05
16.769AlaLeu: 16.769 ± 0.196
2.694AlaMet: 2.694 ± 0.065
1.831AlaAsn: 1.831 ± 0.056
7.239AlaPro: 7.239 ± 0.132
3.686AlaGln: 3.686 ± 0.084
12.794AlaArg: 12.794 ± 0.152
4.575AlaSer: 4.575 ± 0.088
5.156AlaThr: 5.156 ± 0.098
13.571AlaVal: 13.571 ± 0.159
3.376AlaTrp: 3.376 ± 0.09
2.878AlaTyr: 2.878 ± 0.064
0.0AlaXaa: 0.0 ± 0.0
Cys
0.586CysAla: 0.586 ± 0.028
0.084CysCys: 0.084 ± 0.011
0.272CysAsp: 0.272 ± 0.018
0.227CysGlu: 0.227 ± 0.017
0.156CysPhe: 0.156 ± 0.015
0.821CysGly: 0.821 ± 0.033
0.188CysHis: 0.188 ± 0.017
0.166CysIle: 0.166 ± 0.015
0.069CysLys: 0.069 ± 0.009
0.583CysLeu: 0.583 ± 0.029
0.092CysMet: 0.092 ± 0.01
0.118CysAsn: 0.118 ± 0.012
0.688CysPro: 0.688 ± 0.034
0.176CysGln: 0.176 ± 0.017
0.77CysArg: 0.77 ± 0.039
0.288CysSer: 0.288 ± 0.017
0.309CysThr: 0.309 ± 0.021
0.307CysVal: 0.307 ± 0.023
0.158CysTrp: 0.158 ± 0.016
0.149CysTyr: 0.149 ± 0.015
0.0CysXaa: 0.0 ± 0.0
Asp
5.082AspAla: 5.082 ± 0.086
0.253AspCys: 0.253 ± 0.019
1.618AspAsp: 1.618 ± 0.049
1.978AspGlu: 1.978 ± 0.059
1.239AspPhe: 1.239 ± 0.045
4.346AspGly: 4.346 ± 0.077
1.049AspHis: 1.049 ± 0.041
1.455AspIle: 1.455 ± 0.045
0.598AspLys: 0.598 ± 0.03
5.756AspLeu: 5.756 ± 0.101
0.655AspMet: 0.655 ± 0.029
0.673AspAsn: 0.673 ± 0.03
4.69AspPro: 4.69 ± 0.09
1.283AspGln: 1.283 ± 0.044
4.627AspArg: 4.627 ± 0.083
1.403AspSer: 1.403 ± 0.044
1.876AspThr: 1.876 ± 0.051
3.008AspVal: 3.008 ± 0.069
0.987AspTrp: 0.987 ± 0.034
1.001AspTyr: 1.001 ± 0.037
0.0AspXaa: 0.0 ± 0.0
Glu
9.866GluAla: 9.866 ± 0.164
0.206GluCys: 0.206 ± 0.017
2.527GluAsp: 2.527 ± 0.064
4.289GluGlu: 4.289 ± 0.099
1.119GluPhe: 1.119 ± 0.044
4.945GluGly: 4.945 ± 0.095
1.079GluHis: 1.079 ± 0.04
1.79GluIle: 1.79 ± 0.06
0.844GluLys: 0.844 ± 0.045
5.047GluLeu: 5.047 ± 0.105
1.127GluMet: 1.127 ± 0.044
0.782GluAsn: 0.782 ± 0.035
3.241GluPro: 3.241 ± 0.086
1.797GluGln: 1.797 ± 0.047
5.467GluArg: 5.467 ± 0.1
1.77GluSer: 1.77 ± 0.046
2.764GluThr: 2.764 ± 0.065
4.863GluVal: 4.863 ± 0.091
0.979GluTrp: 0.979 ± 0.04
0.845GluTyr: 0.845 ± 0.033
0.0GluXaa: 0.0 ± 0.0
Phe
3.214PheAla: 3.214 ± 0.069
0.204PheCys: 0.204 ± 0.018
1.305PheAsp: 1.305 ± 0.043
1.189PheGlu: 1.189 ± 0.042
1.04PhePhe: 1.04 ± 0.041
2.787PheGly: 2.787 ± 0.063
0.613PheHis: 0.613 ± 0.029
0.885PheIle: 0.885 ± 0.039
0.406PheLys: 0.406 ± 0.025
3.621PheLeu: 3.621 ± 0.078
0.495PheMet: 0.495 ± 0.024
0.633PheAsn: 0.633 ± 0.031
1.748PhePro: 1.748 ± 0.046
0.8PheGln: 0.8 ± 0.032
2.536PheArg: 2.536 ± 0.05
1.434PheSer: 1.434 ± 0.047
1.589PheThr: 1.589 ± 0.045
1.987PheVal: 1.987 ± 0.05
0.721PheTrp: 0.721 ± 0.031
0.814PheTyr: 0.814 ± 0.032
0.0PheXaa: 0.0 ± 0.0
Gly
10.589GlyAla: 10.589 ± 0.146
0.762GlyCys: 0.762 ± 0.035
3.751GlyAsp: 3.751 ± 0.072
4.893GlyGlu: 4.893 ± 0.083
3.245GlyPhe: 3.245 ± 0.072
9.313GlyGly: 9.313 ± 0.166
2.111GlyHis: 2.111 ± 0.066
3.845GlyIle: 3.845 ± 0.076
1.653GlyLys: 1.653 ± 0.051
11.63GlyLeu: 11.63 ± 0.156
2.348GlyMet: 2.348 ± 0.054
1.561GlyAsn: 1.561 ± 0.055
6.822GlyPro: 6.822 ± 0.121
3.465GlyGln: 3.465 ± 0.079
10.02GlyArg: 10.02 ± 0.124
4.994GlySer: 4.994 ± 0.086
5.221GlyThr: 5.221 ± 0.09
7.614GlyVal: 7.614 ± 0.097
2.572GlyTrp: 2.572 ± 0.072
2.337GlyTyr: 2.337 ± 0.054
0.0GlyXaa: 0.0 ± 0.0
His
2.116HisAla: 2.116 ± 0.056
0.204HisCys: 0.204 ± 0.017
0.861HisAsp: 0.861 ± 0.03
0.834HisGlu: 0.834 ± 0.033
0.608HisPhe: 0.608 ± 0.028
2.025HisGly: 2.025 ± 0.048
0.642HisHis: 0.642 ± 0.035
0.665HisIle: 0.665 ± 0.034
0.298HisLys: 0.298 ± 0.018
2.641HisLeu: 2.641 ± 0.06
0.32HisMet: 0.32 ± 0.02
0.347HisAsn: 0.347 ± 0.018
2.122HisPro: 2.122 ± 0.058
0.666HisGln: 0.666 ± 0.033
2.004HisArg: 2.004 ± 0.055
0.765HisSer: 0.765 ± 0.034
0.928HisThr: 0.928 ± 0.034
1.32HisVal: 1.32 ± 0.042
0.547HisTrp: 0.547 ± 0.027
0.529HisTyr: 0.529 ± 0.029
0.0HisXaa: 0.0 ± 0.0
Ile
3.714IleAla: 3.714 ± 0.067
0.206IleCys: 0.206 ± 0.016
1.556IleAsp: 1.556 ± 0.05
1.443IleGlu: 1.443 ± 0.046
0.861IlePhe: 0.861 ± 0.037
3.159IleGly: 3.159 ± 0.077
0.697IleHis: 0.697 ± 0.029
1.127IleIle: 1.127 ± 0.047
0.567IleLys: 0.567 ± 0.032
3.904IleLeu: 3.904 ± 0.073
0.55IleMet: 0.55 ± 0.028
0.74IleAsn: 0.74 ± 0.034
2.273IlePro: 2.273 ± 0.055
0.878IleGln: 0.878 ± 0.034
3.343IleArg: 3.343 ± 0.072
1.338IleSer: 1.338 ± 0.043
1.871IleThr: 1.871 ± 0.055
2.236IleVal: 2.236 ± 0.069
0.613IleTrp: 0.613 ± 0.027
0.718IleTyr: 0.718 ± 0.033
0.0IleXaa: 0.0 ± 0.0
Lys
2.182LysAla: 2.182 ± 0.058
0.089LysCys: 0.089 ± 0.013
0.745LysAsp: 0.745 ± 0.032
0.942LysGlu: 0.942 ± 0.044
0.318LysPhe: 0.318 ± 0.018
1.378LysGly: 1.378 ± 0.047
0.257LysHis: 0.257 ± 0.017
0.487LysIle: 0.487 ± 0.028
0.43LysLys: 0.43 ± 0.029
1.366LysLeu: 1.366 ± 0.054
0.299LysMet: 0.299 ± 0.021
0.314LysAsn: 0.314 ± 0.022
1.014LysPro: 1.014 ± 0.033
0.442LysGln: 0.442 ± 0.027
1.234LysArg: 1.234 ± 0.045
0.635LysSer: 0.635 ± 0.028
0.948LysThr: 0.948 ± 0.039
1.32LysVal: 1.32 ± 0.051
0.227LysTrp: 0.227 ± 0.019
0.285LysTyr: 0.285 ± 0.021
0.0LysXaa: 0.0 ± 0.0
Leu
19.178LeuAla: 19.178 ± 0.22
0.544LeuCys: 0.544 ± 0.029
5.407LeuAsp: 5.407 ± 0.096
7.406LeuGlu: 7.406 ± 0.124
3.137LeuPhe: 3.137 ± 0.076
10.786LeuGly: 10.786 ± 0.147
2.183LeuHis: 2.183 ± 0.053
3.42LeuIle: 3.42 ± 0.071
2.07LeuLys: 2.07 ± 0.066
12.973LeuLeu: 12.973 ± 0.198
1.849LeuMet: 1.849 ± 0.049
2.087LeuAsn: 2.087 ± 0.061
8.061LeuPro: 8.061 ± 0.127
2.907LeuGln: 2.907 ± 0.055
8.23LeuArg: 8.23 ± 0.113
5.011LeuSer: 5.011 ± 0.092
6.579LeuThr: 6.579 ± 0.098
9.748LeuVal: 9.748 ± 0.11
2.339LeuTrp: 2.339 ± 0.063
2.349LeuTyr: 2.349 ± 0.059
0.0LeuXaa: 0.0 ± 0.0
Met
3.241MetAla: 3.241 ± 0.058
0.084MetCys: 0.084 ± 0.009
0.9MetAsp: 0.9 ± 0.032
1.093MetGlu: 1.093 ± 0.039
0.39MetPhe: 0.39 ± 0.024
1.774MetGly: 1.774 ± 0.05
0.369MetHis: 0.369 ± 0.022
0.602MetIle: 0.602 ± 0.031
0.424MetLys: 0.424 ± 0.027
1.722MetLeu: 1.722 ± 0.045
0.355MetMet: 0.355 ± 0.025
0.417MetAsn: 0.417 ± 0.023
1.176MetPro: 1.176 ± 0.043
0.589MetGln: 0.589 ± 0.027
1.492MetArg: 1.492 ± 0.047
0.834MetSer: 0.834 ± 0.032
1.097MetThr: 1.097 ± 0.034
1.702MetVal: 1.702 ± 0.052
0.237MetTrp: 0.237 ± 0.017
0.25MetTyr: 0.25 ± 0.017
0.0MetXaa: 0.0 ± 0.0
Asn
1.814AsnAla: 1.814 ± 0.055
0.117AsnCys: 0.117 ± 0.012
0.642AsnAsp: 0.642 ± 0.033
0.569AsnGlu: 0.569 ± 0.027
0.485AsnPhe: 0.485 ± 0.025
1.685AsnGly: 1.685 ± 0.06
0.369AsnHis: 0.369 ± 0.021
0.65AsnIle: 0.65 ± 0.03
0.261AsnLys: 0.261 ± 0.02
2.076AsnLeu: 2.076 ± 0.053
0.271AsnMet: 0.271 ± 0.02
0.333AsnAsn: 0.333 ± 0.02
1.705AsnPro: 1.705 ± 0.051
0.541AsnGln: 0.541 ± 0.037
1.68AsnArg: 1.68 ± 0.042
0.595AsnSer: 0.595 ± 0.031
0.813AsnThr: 0.813 ± 0.035
1.172AsnVal: 1.172 ± 0.044
0.315AsnTrp: 0.315 ± 0.019
0.338AsnTyr: 0.338 ± 0.022
0.0AsnXaa: 0.0 ± 0.0
Pro
11.613ProAla: 11.613 ± 0.174
0.362ProCys: 0.362 ± 0.024
3.931ProAsp: 3.931 ± 0.073
4.589ProGlu: 4.589 ± 0.083
1.827ProPhe: 1.827 ± 0.051
8.619ProGly: 8.619 ± 0.134
1.411ProHis: 1.411 ± 0.049
1.448ProIle: 1.448 ± 0.05
0.893ProLys: 0.893 ± 0.035
6.966ProLeu: 6.966 ± 0.108
1.156ProMet: 1.156 ± 0.037
0.86ProAsn: 0.86 ± 0.033
5.541ProPro: 5.541 ± 0.131
1.828ProGln: 1.828 ± 0.048
4.947ProArg: 4.947 ± 0.086
2.47ProSer: 2.47 ± 0.057
2.26ProThr: 2.26 ± 0.056
6.583ProVal: 6.583 ± 0.1
1.63ProTrp: 1.63 ± 0.048
1.466ProTyr: 1.466 ± 0.043
0.0ProXaa: 0.0 ± 0.0
Gln
5.37GlnAla: 5.37 ± 0.108
0.14GlnCys: 0.14 ± 0.013
1.325GlnAsp: 1.325 ± 0.049
2.03GlnGlu: 2.03 ± 0.055
0.634GlnPhe: 0.634 ± 0.031
3.025GlnGly: 3.025 ± 0.066
0.615GlnHis: 0.615 ± 0.027
0.898GlnIle: 0.898 ± 0.041
0.45GlnLys: 0.45 ± 0.025
2.99GlnLeu: 2.99 ± 0.064
0.515GlnMet: 0.515 ± 0.024
0.497GlnAsn: 0.497 ± 0.033
2.02GlnPro: 2.02 ± 0.057
1.097GlnGln: 1.097 ± 0.053
2.291GlnArg: 2.291 ± 0.047
1.033GlnSer: 1.033 ± 0.042
1.25GlnThr: 1.25 ± 0.048
2.85GlnVal: 2.85 ± 0.064
0.569GlnTrp: 0.569 ± 0.027
0.595GlnTyr: 0.595 ± 0.03
0.0GlnXaa: 0.0 ± 0.0
Arg
10.357ArgAla: 10.357 ± 0.122
0.608ArgCys: 0.608 ± 0.035
3.539ArgAsp: 3.539 ± 0.067
5.502ArgGlu: 5.502 ± 0.1
2.938ArgPhe: 2.938 ± 0.063
6.512ArgGly: 6.512 ± 0.097
2.121ArgHis: 2.121 ± 0.054
3.363ArgIle: 3.363 ± 0.06
1.333ArgLys: 1.333 ± 0.047
11.731ArgLeu: 11.731 ± 0.134
1.928ArgMet: 1.928 ± 0.049
1.304ArgAsn: 1.304 ± 0.047
6.604ArgPro: 6.604 ± 0.115
3.639ArgGln: 3.639 ± 0.078
10.186ArgArg: 10.186 ± 0.141
3.345ArgSer: 3.345 ± 0.079
4.212ArgThr: 4.212 ± 0.082
7.068ArgVal: 7.068 ± 0.108
2.436ArgTrp: 2.436 ± 0.062
2.366ArgTyr: 2.366 ± 0.063
0.0ArgXaa: 0.0 ± 0.0
Ser
4.535SerAla: 4.535 ± 0.084
0.312SerCys: 0.312 ± 0.023
1.405SerAsp: 1.405 ± 0.046
1.522SerGlu: 1.522 ± 0.045
1.165SerPhe: 1.165 ± 0.039
4.868SerGly: 4.868 ± 0.105
0.817SerHis: 0.817 ± 0.035
1.185SerIle: 1.185 ± 0.041
0.528SerLys: 0.528 ± 0.029
4.805SerLeu: 4.805 ± 0.078
0.835SerMet: 0.835 ± 0.033
0.72SerAsn: 0.72 ± 0.029
3.183SerPro: 3.183 ± 0.072
1.137SerGln: 1.137 ± 0.039
3.939SerArg: 3.939 ± 0.077
1.77SerSer: 1.77 ± 0.06
1.929SerThr: 1.929 ± 0.071
2.745SerVal: 2.745 ± 0.069
0.942SerTrp: 0.942 ± 0.038
0.858SerTyr: 0.858 ± 0.037
0.0SerXaa: 0.0 ± 0.0
Thr
7.034ThrAla: 7.034 ± 0.114
0.34ThrCys: 0.34 ± 0.021
1.925ThrAsp: 1.925 ± 0.052
1.866ThrGlu: 1.866 ± 0.05
1.446ThrPhe: 1.446 ± 0.049
5.496ThrGly: 5.496 ± 0.098
0.804ThrHis: 0.804 ± 0.036
1.584ThrIle: 1.584 ± 0.05
0.519ThrLys: 0.519 ± 0.028
5.713ThrLeu: 5.713 ± 0.097
0.85ThrMet: 0.85 ± 0.034
0.762ThrAsn: 0.762 ± 0.037
3.524ThrPro: 3.524 ± 0.076
1.085ThrGln: 1.085 ± 0.045
3.716ThrArg: 3.716 ± 0.069
1.622ThrSer: 1.622 ± 0.054
2.347ThrThr: 2.347 ± 0.077
5.432ThrVal: 5.432 ± 0.101
0.954ThrTrp: 0.954 ± 0.038
1.062ThrTyr: 1.062 ± 0.042
0.0ThrXaa: 0.0 ± 0.0
Val
11.253ValAla: 11.253 ± 0.133
0.498ValCys: 0.498 ± 0.024
3.957ValAsp: 3.957 ± 0.083
5.288ValGlu: 5.288 ± 0.095
2.388ValPhe: 2.388 ± 0.058
6.578ValGly: 6.578 ± 0.106
1.763ValHis: 1.763 ± 0.043
2.885ValIle: 2.885 ± 0.049
1.339ValLys: 1.339 ± 0.04
10.457ValLeu: 10.457 ± 0.128
1.619ValMet: 1.619 ± 0.045
1.584ValAsn: 1.584 ± 0.048
5.805ValPro: 5.805 ± 0.077
2.413ValGln: 2.413 ± 0.055
7.183ValArg: 7.183 ± 0.111
3.572ValSer: 3.572 ± 0.075
4.715ValThr: 4.715 ± 0.093
8.232ValVal: 8.232 ± 0.122
1.598ValTrp: 1.598 ± 0.05
1.903ValTyr: 1.903 ± 0.064
0.0ValXaa: 0.0 ± 0.0
Trp
2.842TrpAla: 2.842 ± 0.075
0.171TrpCys: 0.171 ± 0.013
0.963TrpAsp: 0.963 ± 0.04
1.295TrpGlu: 1.295 ± 0.052
0.573TrpPhe: 0.573 ± 0.03
1.932TrpGly: 1.932 ± 0.059
0.477TrpHis: 0.477 ± 0.025
0.758TrpIle: 0.758 ± 0.031
0.276TrpLys: 0.276 ± 0.02
2.624TrpLeu: 2.624 ± 0.062
0.52TrpMet: 0.52 ± 0.025
0.406TrpAsn: 0.406 ± 0.022
1.49TrpPro: 1.49 ± 0.053
0.968TrpGln: 0.968 ± 0.039
2.131TrpArg: 2.131 ± 0.061
0.989TrpSer: 0.989 ± 0.035
1.11TrpThr: 1.11 ± 0.042
1.759TrpVal: 1.759 ± 0.055
0.714TrpTrp: 0.714 ± 0.037
0.395TrpTyr: 0.395 ± 0.025
0.0TrpXaa: 0.0 ± 0.0
Tyr
2.372TyrAla: 2.372 ± 0.06
0.166TyrCys: 0.166 ± 0.015
1.014TyrAsp: 1.014 ± 0.041
0.904TyrGlu: 0.904 ± 0.038
0.694TyrPhe: 0.694 ± 0.033
2.182TyrGly: 2.182 ± 0.06
0.618TyrHis: 0.618 ± 0.032
0.642TyrIle: 0.642 ± 0.031
0.319TyrLys: 0.319 ± 0.022
2.892TyrLeu: 2.892 ± 0.069
0.268TyrMet: 0.268 ± 0.019
0.462TyrAsn: 0.462 ± 0.024
1.453TyrPro: 1.453 ± 0.043
0.795TyrGln: 0.795 ± 0.036
2.501TyrArg: 2.501 ± 0.059
0.758TyrSer: 0.758 ± 0.037
1.107TyrThr: 1.107 ± 0.041
1.514TyrVal: 1.514 ± 0.046
0.48TyrTrp: 0.48 ± 0.027
0.603TyrTyr: 0.603 ± 0.032
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 2747 proteins (771356 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