| Chain ID | Description | Type | Chain length | Formula weight | Number of molecules | DB Name (Accession) | Biological source | Descriptive keywords |
| A | DNA-directed RNA polymerase I subunit RPA190 | polymer | 1664 | 186677.0 | 1 | | Saccharomyces cerevisiae (strain ATCC 204508 / S288c) (Baker's yeast) | DNA-directed RNA polymerase I 190 kDa polypeptide,A190,DNA-directed RNA polymerase I largest subunit |
| B | DNA-directed RNA polymerase I subunit RPA135 | polymer | 1203 | 135910.3 | 1 | | Saccharomyces cerevisiae (strain ATCC 204508 / S288c) (Baker's yeast) | DNA-directed RNA polymerase I 135 kDa polypeptide,A135,DNA-directed RNA polymerase I polypeptide 2,RNA polymerase I subunit 2 |
| C | DNA-directed RNA polymerases I and III subunit RPAC1 | polymer | 335 | 37732.6 | 1 | | Saccharomyces cerevisiae (strain ATCC 204508 / S288c) (Baker's yeast) | RNA polymerases I and III subunit AC1,C37,DNA-directed RNA polymerases I and III 40 kDa polypeptide,C40 |
| D | DNA-directed RNA polymerase I subunit RPA14 | polymer | 137 | 14599.1 | 1 | | Saccharomyces cerevisiae (strain ATCC 204508 / S288c) (Baker's yeast) | A14,DNA-directed RNA polymerase I 14 kDa polypeptide |
| E | DNA-directed RNA polymerases I, II, and III subunit RPABC1 | polymer | 215 | 25117.1 | 1 | | Saccharomyces cerevisiae (strain ATCC 204508 / S288c) (Baker's yeast) | RNA polymerases I,II,and III subunit ABC1,ABC27,DNA-directed RNA polymerases I,and III 27 kDa polypeptide |
| F | DNA-directed RNA polymerases I, II, and III subunit RPABC2 | polymer | 155 | 17931.8 | 1 | | Saccharomyces cerevisiae (strain ATCC 204508 / S288c) (Baker's yeast) | RNA polymerases I,II,and III subunit ABC2,ABC23,DNA-directed RNA polymerases I,and III 23 kDa polypeptide |
| G | DNA-directed RNA polymerase I subunit RPA43 | polymer | 326 | 36264.9 | 1 | | Saccharomyces cerevisiae (strain ATCC 204508 / S288c) (Baker's yeast) | A43,DNA-directed DNA-dependent RNA polymerase 36 kDa polypeptide |
| H | DNA-directed RNA polymerases I, II, and III subunit RPABC3 | polymer | 146 | 16525.4 | 1 | | Saccharomyces cerevisiae (strain ATCC 204508 / S288c) (Baker's yeast) | RNA polymerases I,II,and III subunit ABC3,ABC14.4,ABC14.5,DNA-directed RNA polymerases I,and III 14.5 kDa polypeptide |
| I | DNA-directed RNA polymerase I subunit RPA12 | polymer | 125 | 13676.6 | 1 | | Saccharomyces cerevisiae (strain ATCC 204508 / S288c) (Baker's yeast) | A12,A12.2,DNA-directed RNA polymerase I 13.7 kDa polypeptide |
| J | DNA-directed RNA polymerases I, II, and III subunit RPABC5 | polymer | 70 | 8290.7 | 1 | | Saccharomyces cerevisiae (strain ATCC 204508 / S288c) (Baker's yeast) | RNA polymerases I,II,and III subunit ABC5,ABC10-beta,ABC8,DNA-directed RNA polymerases I,and III 8.3 kDa polypeptide |
| K | DNA-directed RNA polymerases I and III subunit RPAC2 | polymer | 142 | 16167.9 | 1 | | Saccharomyces cerevisiae (strain ATCC 204508 / S288c) (Baker's yeast) | RNA polymerases I and III subunit AC2,AC19,DNA-directed RNA polymerases I and III 16 kDa polypeptide,RPA19 |
| L | DNA-directed RNA polymerases I, II, and III subunit RPABC4 | polymer | 70 | 7730.0 | 1 | | Saccharomyces cerevisiae (strain ATCC 204508 / S288c) (Baker's yeast) | RNA polymerases I,II,and III subunit ABC4,ABC10-alpha |
| M | DNA-directed RNA polymerase I subunit RPA49 | polymer | 415 | 46721.7 | 1 | | Saccharomyces cerevisiae (strain ATCC 204508 / S288c) (Baker's yeast) | A49,DNA-directed RNA polymerase I 49 kDa polypeptide |
| N | DNA-directed RNA polymerase I subunit RPA34 | polymer | 233 | 26933.5 | 1 | | Saccharomyces cerevisiae (strain ATCC 204508 / S288c) (Baker's yeast) | A34,DNA-directed DNA-dependent RNA polymerase 34.5 kDa polypeptide,A34.5 |
| O | RNA polymerase I-specific transcription initiation factor RRN6 | polymer | 894 | 100690.2 | 1 | | Saccharomyces cerevisiae (strain ATCC 204508 / S288c) (Baker's yeast) | |
| P | RNA polymerase I-specific transcription initiation factor RRN7 | polymer | 514 | 60435.2 | 1 | | Saccharomyces cerevisiae (strain ATCC 204508 / S288c) (Baker's yeast) | |
| Q | RNA polymerase I-specific transcription initiation factor RRN11 | polymer | 507 | 59334.3 | 1 | | Saccharomyces cerevisiae (strain ATCC 204508 / S288c) (Baker's yeast) | |
| R | RNA | polymer | 6 | 1915.2 | 1 | | Saccharomyces cerevisiae S288c | |
| S | non-template strand DNA | polymer | 54 | 16803.8 | 1 | | Saccharomyces cerevisiae S288c | |
| T | template strand DNA | polymer | 54 | 16360.5 | 1 | | Saccharomyces cerevisiae S288c | |
| ZINC ION | non-polymer | | 65.4 | 6 | | | |
