There is some data about proteoms of Escherichia coli (strain K12) and Lentibacillus amyloliquefaciens.
| Organism | Proteome ID | The number of sequences | The number of residues |
| Escherichia coli (strain K12) | UP000000625 | 4306 | 1356195 |
| Lentibacillus amyloliquefaciens | UP000050331 | 3553 | 1007125 |
| The residue | % in E. coli | % L. amyloliquefaciens | The difference of % |
| L | 10.6724% | 9.2923% | 1.3801% |
| E | 5.7622% | 7.5462% | -1.7840% |
| I | 6.0102% | 7.5356% | -1.5254% |
| A | 9.5140% | 7.2473% | 2.2667% |
| G | 7.3746% | 7.0370% | 0.3376% |
| V | 7.0729% | 6.8575% | 0.2154% |
| K | 4.4062% | 6.2792% | -1.8730% |
| S | 5.8023% | 6.0143% | -0.2120% |
| D | 5.1513% | 5.8024% | -0.6511% |
| T | 5.3986% | 5.5296% | -0.1310% |
| N | 3.9453% | 4.6495% | -0.7042% |
| F | 3.8915% | 4.4527% | -0.5612% |
| R | 5.5110% | 4.0400% | 1.4710% |
| Q | 4.4398% | 3.8491% | 0.5907% |
| P | 4.4264% | 3.6161% | 0.8103% |
| Y | 2.8452% | 3.4682% | -0.6230% |
| M | 2.8200% | 2.9683% | -0.1483% |
| H | 2.2667% | 2.1316% | 0.1351% |
| W | 1.5311% | 1.0599% | 0.4712% |
| C | 1.1581% | 0.6233% | 0.5348% |
| U | 0.0002% | 0.0000% | 0.0002% |
*Calculated by python: program (if you want to download it: program). Command line: "python wordcount.py Escherichia_coli_K12.txt Lentibacillus_amyloliquefaciens.txt wordcount.txt".
The most common letter in E.coli's and L. amyloliquefaciens' proteoms is Leu. Another common letters: Ala (more in E.coli), Gly (more in E.coli), Val (more in E.coli), Glu (more in L. amyloliquefaciens), Ile (more in L. amyloliquefaciens).The most rare residue Cys (more in E.coli) and Trp (more in E.coli).The fact that there is much more Glu, Ile, Lys in L. amyloliquefaciens' proteome then in E.coli's.
In the process ...