FUNCTION: INVOLVED IN THE ATP-DEPENDENT SELECTIVE DEGRADATION OF CELLULAR PROTEINS, THE MAINTENANCE OF CHROMATIN STRUCTURE, THE REGULATION OF GENE EXPRESSION, THE STRESS RESPONSE, AND RIBOSOME BIOGENESIS. * SUBCELLULAR LOCATION: Nuclear and cytoplasmic. * MISCELLANEOUS: UBIQUITIN IS SYNTHESIZED AS A POLYUBIQUITIN PRECURSOR WITH EXACT HEAD TO TAIL REPEATS, THE NUMBER OF REPEAT DIFFER BETWEEN SPECIES (UP TO 12 IN XENOPUS). IN SOME SPECIES THERE IS A FINAL AMINO-ACID AFTER THE LAST REPEAT, IN HUMAN: VAL, IN CHICKEN: TYR. SOME UBIQUITIN GENES CONTAIN A SINGLE COPY OF UBIQUITIN FUSED TO A RIBOSOMAL PROTEIN (EITHER L40 OR S27A). |
|
31-JUL-00
Last Update 13-Mar-03