Amino acid dipepetide frequency for Streptococcus pneumoniae (strain ATCC BAA-255 / R6)

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
5.223AlaAla: 5.223 ± 0.149
0.514AlaCys: 0.514 ± 0.029
3.967AlaAsp: 3.967 ± 0.089
5.124AlaGlu: 5.124 ± 0.132
3.374AlaPhe: 3.374 ± 0.084
5.459AlaGly: 5.459 ± 0.131
1.383AlaHis: 1.383 ± 0.054
5.625AlaIle: 5.625 ± 0.099
4.988AlaLys: 4.988 ± 0.119
7.388AlaLeu: 7.388 ± 0.126
1.848AlaMet: 1.848 ± 0.06
2.971AlaAsn: 2.971 ± 0.066
2.223AlaPro: 2.223 ± 0.071
3.063AlaGln: 3.063 ± 0.077
2.882AlaArg: 2.882 ± 0.083
4.546AlaSer: 4.546 ± 0.087
4.172AlaThr: 4.172 ± 0.099
5.143AlaVal: 5.143 ± 0.11
0.629AlaTrp: 0.629 ± 0.035
2.754AlaTyr: 2.754 ± 0.064
0.0AlaXaa: 0.0 ± 0.0
Cys
0.32CysAla: 0.32 ± 0.022
0.073CysCys: 0.073 ± 0.01
0.322CysAsp: 0.322 ± 0.023
0.286CysGlu: 0.286 ± 0.025
0.319CysPhe: 0.319 ± 0.027
0.55CysGly: 0.55 ± 0.032
0.191CysHis: 0.191 ± 0.019
0.387CysIle: 0.387 ± 0.028
0.337CysLys: 0.337 ± 0.025
0.68CysLeu: 0.68 ± 0.037
0.155CysMet: 0.155 ± 0.018
0.24CysAsn: 0.24 ± 0.019
0.233CysPro: 0.233 ± 0.021
0.31CysGln: 0.31 ± 0.027
0.271CysArg: 0.271 ± 0.022
0.436CysSer: 0.436 ± 0.029
0.228CysThr: 0.228 ± 0.02
0.361CysVal: 0.361 ± 0.027
0.068CysTrp: 0.068 ± 0.011
0.274CysTyr: 0.274 ± 0.022
0.0CysXaa: 0.0 ± 0.0
Asp
3.604AspAla: 3.604 ± 0.089
0.312AspCys: 0.312 ± 0.025
2.492AspAsp: 2.492 ± 0.074
3.858AspGlu: 3.858 ± 0.081
3.291AspPhe: 3.291 ± 0.08
3.988AspGly: 3.988 ± 0.205
0.99AspHis: 0.99 ± 0.052
4.008AspIle: 4.008 ± 0.088
4.293AspLys: 4.293 ± 0.115
6.081AspLeu: 6.081 ± 0.103
1.439AspMet: 1.439 ± 0.051
2.323AspAsn: 2.323 ± 0.07
1.511AspPro: 1.511 ± 0.056
2.165AspGln: 2.165 ± 0.063
2.102AspArg: 2.102 ± 0.059
3.059AspSer: 3.059 ± 0.078
2.514AspThr: 2.514 ± 0.069
3.603AspVal: 3.603 ± 0.075
0.625AspTrp: 0.625 ± 0.036
2.765AspTyr: 2.765 ± 0.08
0.0AspXaa: 0.0 ± 0.0
Glu
5.488GluAla: 5.488 ± 0.112
0.337GluCys: 0.337 ± 0.028
3.802GluAsp: 3.802 ± 0.076
6.594GluGlu: 6.594 ± 0.152
2.72GluPhe: 2.72 ± 0.079
3.841GluGly: 3.841 ± 0.087
1.288GluHis: 1.288 ± 0.043
5.628GluIle: 5.628 ± 0.112
6.458GluLys: 6.458 ± 0.129
7.112GluLeu: 7.112 ± 0.118
1.957GluMet: 1.957 ± 0.062
4.056GluAsn: 4.056 ± 0.098
1.571GluPro: 1.571 ± 0.051
2.833GluGln: 2.833 ± 0.079
3.424GluArg: 3.424 ± 0.097
3.662GluSer: 3.662 ± 0.095
3.867GluThr: 3.867 ± 0.093
5.097GluVal: 5.097 ± 0.101
0.669GluTrp: 0.669 ± 0.044
2.122GluTyr: 2.122 ± 0.057
0.0GluXaa: 0.0 ± 0.0
Phe
3.415PheAla: 3.415 ± 0.076
0.308PheCys: 0.308 ± 0.026
2.916PheAsp: 2.916 ± 0.077
3.221PheGlu: 3.221 ± 0.088
2.395PhePhe: 2.395 ± 0.088
3.247PheGly: 3.247 ± 0.075
0.85PheHis: 0.85 ± 0.039
3.225PheIle: 3.225 ± 0.095
2.603PheLys: 2.603 ± 0.071
5.001PheLeu: 5.001 ± 0.133
1.112PheMet: 1.112 ± 0.049
1.898PheAsn: 1.898 ± 0.051
1.559PhePro: 1.559 ± 0.052
1.668PheGln: 1.668 ± 0.057
1.613PheArg: 1.613 ± 0.06
3.339PheSer: 3.339 ± 0.086
2.439PheThr: 2.439 ± 0.068
3.265PheVal: 3.265 ± 0.09
0.508PheTrp: 0.508 ± 0.031
1.978PheTyr: 1.978 ± 0.062
0.0PheXaa: 0.0 ± 0.0
Gly
4.782GlyAla: 4.782 ± 0.146
0.45GlyCys: 0.45 ± 0.032
3.427GlyAsp: 3.427 ± 0.106
3.981GlyGlu: 3.981 ± 0.122
3.289GlyPhe: 3.289 ± 0.084
4.224GlyGly: 4.224 ± 0.096
1.288GlyHis: 1.288 ± 0.049
5.367GlyIle: 5.367 ± 0.121
4.899GlyLys: 4.899 ± 0.127
6.754GlyLeu: 6.754 ± 0.121
1.76GlyMet: 1.76 ± 0.052
2.751GlyAsn: 2.751 ± 0.079
1.364GlyPro: 1.364 ± 0.054
2.984GlyGln: 2.984 ± 0.074
2.751GlyArg: 2.751 ± 0.072
3.763GlySer: 3.763 ± 0.098
3.666GlyThr: 3.666 ± 0.09
4.996GlyVal: 4.996 ± 0.11
0.732GlyTrp: 0.732 ± 0.049
2.657GlyTyr: 2.657 ± 0.067
0.0GlyXaa: 0.0 ± 0.0
His
1.186HisAla: 1.186 ± 0.043
0.14HisCys: 0.14 ± 0.014
0.961HisAsp: 0.961 ± 0.04
1.126HisGlu: 1.126 ± 0.046
1.221HisPhe: 1.221 ± 0.042
1.286HisGly: 1.286 ± 0.051
0.577HisHis: 0.577 ± 0.032
1.335HisIle: 1.335 ± 0.048
1.019HisLys: 1.019 ± 0.047
2.102HisLeu: 2.102 ± 0.064
0.424HisMet: 0.424 ± 0.027
0.692HisAsn: 0.692 ± 0.037
0.94HisPro: 0.94 ± 0.04
0.959HisGln: 0.959 ± 0.04
0.933HisArg: 0.933 ± 0.035
1.077HisSer: 1.077 ± 0.05
0.908HisThr: 0.908 ± 0.045
1.184HisVal: 1.184 ± 0.047
0.164HisTrp: 0.164 ± 0.017
1.051HisTyr: 1.051 ± 0.051
0.0HisXaa: 0.0 ± 0.0
Ile
5.826IleAla: 5.826 ± 0.111
0.559IleCys: 0.559 ± 0.033
4.146IleAsp: 4.146 ± 0.088
5.015IleGlu: 5.015 ± 0.102
3.507IlePhe: 3.507 ± 0.093
4.899IleGly: 4.899 ± 0.108
1.424IleHis: 1.424 ± 0.055
5.064IleIle: 5.064 ± 0.138
4.441IleLys: 4.441 ± 0.088
7.87IleLeu: 7.87 ± 0.183
1.557IleMet: 1.557 ± 0.06
3.018IleAsn: 3.018 ± 0.09
2.84IlePro: 2.84 ± 0.072
2.785IleGln: 2.785 ± 0.077
3.008IleArg: 3.008 ± 0.075
5.027IleSer: 5.027 ± 0.111
3.657IleThr: 3.657 ± 0.084
4.988IleVal: 4.988 ± 0.099
0.622IleTrp: 0.622 ± 0.037
2.605IleTyr: 2.605 ± 0.07
0.0IleXaa: 0.0 ± 0.0
Lys
4.768LysAla: 4.768 ± 0.105
0.266LysCys: 0.266 ± 0.025
4.138LysAsp: 4.138 ± 0.126
6.626LysGlu: 6.626 ± 0.133
2.034LysPhe: 2.034 ± 0.055
4.187LysGly: 4.187 ± 0.134
1.167LysHis: 1.167 ± 0.042
4.984LysIle: 4.984 ± 0.092
5.538LysLys: 5.538 ± 0.113
6.073LysLeu: 6.073 ± 0.116
2.083LysMet: 2.083 ± 0.062
3.523LysAsn: 3.523 ± 0.088
2.129LysPro: 2.129 ± 0.079
2.712LysGln: 2.712 ± 0.069
3.073LysArg: 3.073 ± 0.08
3.855LysSer: 3.855 ± 0.085
3.904LysThr: 3.904 ± 0.088
4.753LysVal: 4.753 ± 0.098
0.632LysTrp: 0.632 ± 0.035
2.216LysTyr: 2.216 ± 0.063
0.0LysXaa: 0.0 ± 0.0
Leu
8.776LeuAla: 8.776 ± 0.129
0.54LeuCys: 0.54 ± 0.032
5.841LeuAsp: 5.841 ± 0.118
7.507LeuGlu: 7.507 ± 0.153
4.713LeuPhe: 4.713 ± 0.139
6.541LeuGly: 6.541 ± 0.122
1.71LeuHis: 1.71 ± 0.054
6.681LeuIle: 6.681 ± 0.141
6.538LeuLys: 6.538 ± 0.113
10.524LeuLeu: 10.524 ± 0.204
2.448LeuMet: 2.448 ± 0.068
4.104LeuAsn: 4.104 ± 0.095
4.153LeuPro: 4.153 ± 0.092
3.533LeuGln: 3.533 ± 0.092
3.814LeuArg: 3.814 ± 0.094
7.551LeuSer: 7.551 ± 0.135
6.161LeuThr: 6.161 ± 0.108
7.241LeuVal: 7.241 ± 0.125
0.736LeuTrp: 0.736 ± 0.044
3.298LeuTyr: 3.298 ± 0.087
0.0LeuXaa: 0.0 ± 0.0
Met
1.923MetAla: 1.923 ± 0.062
0.129MetCys: 0.129 ± 0.014
1.39MetAsp: 1.39 ± 0.053
1.656MetGlu: 1.656 ± 0.053
0.802MetPhe: 0.802 ± 0.042
1.622MetGly: 1.622 ± 0.059
0.337MetHis: 0.337 ± 0.021
1.893MetIle: 1.893 ± 0.06
2.182MetLys: 2.182 ± 0.059
2.298MetLeu: 2.298 ± 0.066
0.828MetMet: 0.828 ± 0.039
1.283MetAsn: 1.283 ± 0.049
0.826MetPro: 0.826 ± 0.041
0.891MetGln: 0.891 ± 0.037
1.048MetArg: 1.048 ± 0.043
1.623MetSer: 1.623 ± 0.057
1.773MetThr: 1.773 ± 0.049
1.707MetVal: 1.707 ± 0.057
0.189MetTrp: 0.189 ± 0.017
0.61MetTyr: 0.61 ± 0.031
0.0MetXaa: 0.0 ± 0.0
Asn
2.746AsnAla: 2.746 ± 0.077
0.298AsnCys: 0.298 ± 0.025
2.049AsnAsp: 2.049 ± 0.071
2.405AsnGlu: 2.405 ± 0.062
2.005AsnPhe: 2.005 ± 0.066
3.344AsnGly: 3.344 ± 0.101
1.145AsnHis: 1.145 ± 0.047
3.271AsnIle: 3.271 ± 0.094
2.743AsnLys: 2.743 ± 0.077
4.707AsnLeu: 4.707 ± 0.103
1.162AsnMet: 1.162 ± 0.05
1.932AsnAsn: 1.932 ± 0.063
2.402AsnPro: 2.402 ± 0.066
2.247AsnGln: 2.247 ± 0.068
2.099AsnArg: 2.099 ± 0.062
2.485AsnSer: 2.485 ± 0.065
2.09AsnThr: 2.09 ± 0.063
2.572AsnVal: 2.572 ± 0.081
0.547AsnTrp: 0.547 ± 0.038
1.898AsnTyr: 1.898 ± 0.071
0.0AsnXaa: 0.0 ± 0.0
Pro
2.502ProAla: 2.502 ± 0.081
0.177ProCys: 0.177 ± 0.02
1.99ProAsp: 1.99 ± 0.052
3.039ProGlu: 3.039 ± 0.07
1.685ProPhe: 1.685 ± 0.063
1.664ProGly: 1.664 ± 0.053
0.697ProHis: 0.697 ± 0.038
2.477ProIle: 2.477 ± 0.072
1.94ProLys: 1.94 ± 0.073
3.017ProLeu: 3.017 ± 0.067
0.748ProMet: 0.748 ± 0.037
1.605ProAsn: 1.605 ± 0.051
0.554ProPro: 0.554 ± 0.03
1.341ProGln: 1.341 ± 0.051
1.107ProArg: 1.107 ± 0.044
2.18ProSer: 2.18 ± 0.061
1.961ProThr: 1.961 ± 0.068
2.71ProVal: 2.71 ± 0.08
0.307ProTrp: 0.307 ± 0.023
1.412ProTyr: 1.412 ± 0.055
0.0ProXaa: 0.0 ± 0.0
Gln
3.664GlnAla: 3.664 ± 0.085
0.126GlnCys: 0.126 ± 0.016
2.225GlnAsp: 2.225 ± 0.063
3.623GlnGlu: 3.623 ± 0.098
1.712GlnPhe: 1.712 ± 0.056
2.644GlnGly: 2.644 ± 0.11
0.731GlnHis: 0.731 ± 0.037
2.898GlnIle: 2.898 ± 0.066
2.955GlnLys: 2.955 ± 0.086
4.018GlnLeu: 4.018 ± 0.102
0.959GlnMet: 0.959 ± 0.036
1.732GlnAsn: 1.732 ± 0.06
1.153GlnPro: 1.153 ± 0.047
1.395GlnGln: 1.395 ± 0.059
1.45GlnArg: 1.45 ± 0.05
2.158GlnSer: 2.158 ± 0.061
2.359GlnThr: 2.359 ± 0.07
3.279GlnVal: 3.279 ± 0.079
0.315GlnTrp: 0.315 ± 0.024
1.307GlnTyr: 1.307 ± 0.053
0.0GlnXaa: 0.0 ± 0.0
Arg
2.553ArgAla: 2.553 ± 0.073
0.213ArgCys: 0.213 ± 0.021
2.305ArgAsp: 2.305 ± 0.075
3.197ArgGlu: 3.197 ± 0.075
2.116ArgPhe: 2.116 ± 0.064
2.395ArgGly: 2.395 ± 0.088
0.775ArgHis: 0.775 ± 0.04
3.095ArgIle: 3.095 ± 0.072
3.064ArgLys: 3.064 ± 0.069
4.095ArgLeu: 4.095 ± 0.083
1.22ArgMet: 1.22 ± 0.041
1.884ArgAsn: 1.884 ± 0.051
1.257ArgPro: 1.257 ± 0.051
1.845ArgGln: 1.845 ± 0.064
1.967ArgArg: 1.967 ± 0.064
2.097ArgSer: 2.097 ± 0.071
1.959ArgThr: 1.959 ± 0.067
2.846ArgVal: 2.846 ± 0.072
0.315ArgTrp: 0.315 ± 0.022
1.763ArgTyr: 1.763 ± 0.054
0.0ArgXaa: 0.0 ± 0.0
Ser
3.748SerAla: 3.748 ± 0.082
0.438SerCys: 0.438 ± 0.028
3.305SerAsp: 3.305 ± 0.088
3.656SerGlu: 3.656 ± 0.077
3.061SerPhe: 3.061 ± 0.083
4.306SerGly: 4.306 ± 0.09
1.337SerHis: 1.337 ± 0.048
4.511SerIle: 4.511 ± 0.098
4.202SerLys: 4.202 ± 0.086
6.872SerLeu: 6.872 ± 0.127
1.506SerMet: 1.506 ± 0.053
2.727SerAsn: 2.727 ± 0.077
2.065SerPro: 2.065 ± 0.063
3.139SerGln: 3.139 ± 0.085
2.603SerArg: 2.603 ± 0.073
4.318SerSer: 4.318 ± 0.133
3.078SerThr: 3.078 ± 0.069
4.001SerVal: 4.001 ± 0.09
0.658SerTrp: 0.658 ± 0.038
2.589SerTyr: 2.589 ± 0.073
0.0SerXaa: 0.0 ± 0.0
Thr
3.909ThrAla: 3.909 ± 0.083
0.354ThrCys: 0.354 ± 0.026
3.099ThrAsp: 3.099 ± 0.075
3.519ThrGlu: 3.519 ± 0.078
2.62ThrPhe: 2.62 ± 0.072
4.139ThrGly: 4.139 ± 0.107
1.102ThrHis: 1.102 ± 0.051
4.451ThrIle: 4.451 ± 0.092
3.219ThrLys: 3.219 ± 0.077
5.134ThrLeu: 5.134 ± 0.094
1.106ThrMet: 1.106 ± 0.043
2.196ThrAsn: 2.196 ± 0.063
2.327ThrPro: 2.327 ± 0.07
1.647ThrGln: 1.647 ± 0.054
1.993ThrArg: 1.993 ± 0.058
3.586ThrSer: 3.586 ± 0.085
2.961ThrThr: 2.961 ± 0.089
4.327ThrVal: 4.327 ± 0.107
0.533ThrTrp: 0.533 ± 0.032
2.117ThrTyr: 2.117 ± 0.066
0.0ThrXaa: 0.0 ± 0.0
Val
5.826ValAla: 5.826 ± 0.137
0.497ValCys: 0.497 ± 0.029
3.933ValAsp: 3.933 ± 0.091
5.18ValGlu: 5.18 ± 0.114
3.201ValPhe: 3.201 ± 0.085
4.478ValGly: 4.478 ± 0.093
1.179ValHis: 1.179 ± 0.049
4.816ValIle: 4.816 ± 0.091
4.504ValLys: 4.504 ± 0.098
7.202ValLeu: 7.202 ± 0.146
1.627ValMet: 1.627 ± 0.056
3.064ValAsn: 3.064 ± 0.087
2.4ValPro: 2.4 ± 0.065
2.395ValGln: 2.395 ± 0.066
2.724ValArg: 2.724 ± 0.075
4.465ValSer: 4.465 ± 0.089
4.272ValThr: 4.272 ± 0.1
4.853ValVal: 4.853 ± 0.108
0.535ValTrp: 0.535 ± 0.032
2.436ValTyr: 2.436 ± 0.071
0.0ValXaa: 0.0 ± 0.0
Trp
0.54TrpAla: 0.54 ± 0.031
0.06TrpCys: 0.06 ± 0.01
0.509TrpAsp: 0.509 ± 0.03
0.564TrpGlu: 0.564 ± 0.036
0.443TrpPhe: 0.443 ± 0.031
0.627TrpGly: 0.627 ± 0.043
0.184TrpHis: 0.184 ± 0.018
0.736TrpIle: 0.736 ± 0.036
0.583TrpLys: 0.583 ± 0.035
1.003TrpLeu: 1.003 ± 0.046
0.24TrpMet: 0.24 ± 0.02
0.523TrpAsn: 0.523 ± 0.034
0.179TrpPro: 0.179 ± 0.02
0.45TrpGln: 0.45 ± 0.035
0.365TrpArg: 0.365 ± 0.025
0.593TrpSer: 0.593 ± 0.036
0.525TrpThr: 0.525 ± 0.033
0.509TrpVal: 0.509 ± 0.036
0.136TrpTrp: 0.136 ± 0.017
0.513TrpTyr: 0.513 ± 0.046
0.0TrpXaa: 0.0 ± 0.0
Tyr
2.477TyrAla: 2.477 ± 0.061
0.25TyrCys: 0.25 ± 0.024
2.208TyrAsp: 2.208 ± 0.063
2.349TyrGlu: 2.349 ± 0.067
2.051TyrPhe: 2.051 ± 0.059
2.444TyrGly: 2.444 ± 0.069
0.93TyrHis: 0.93 ± 0.038
2.407TyrIle: 2.407 ± 0.067
2.155TyrLys: 2.155 ± 0.067
4.48TyrLeu: 4.48 ± 0.097
0.83TyrMet: 0.83 ± 0.044
1.623TyrAsn: 1.623 ± 0.058
1.426TyrPro: 1.426 ± 0.05
2.342TyrGln: 2.342 ± 0.077
1.737TyrArg: 1.737 ± 0.059
2.298TyrSer: 2.298 ± 0.071
1.845TyrThr: 1.845 ± 0.061
2.151TyrVal: 2.151 ± 0.061
0.361TyrTrp: 0.361 ± 0.024
1.855TyrTyr: 1.855 ± 0.072
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 2030 proteins (587055 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