Catalysis of the reaction: D-xylose = D-xylulose.

dosage compensation, by hyperactivation of X chromosome

Compensating for the two-fold variation in X-chromosome:autosome ratios between sexes by a global hyperactivation of all, or most of, the genes on the X-chromosome in the heterogametic sex, leading to a two-fold increase in gene expression from this chromosome.

RNA polymerase I, one of three eukaryotic nuclear RNA polymerases, is a multisubunit complex; it produces rRNAs. Two large subunits comprise the most conserved portion including the catalytic site and share similarity with other eukaryotic and bacterial multisubunit RNA polymerases. The remainder of the complex is composed of smaller subunits (generally ten or more), some of which are also found in RNA polymerase III and others which are found in all three nuclear RNA polymerases. Although the core is competent to mediate ribonucleic acid synthesis, it requires additional factors to select the appropriate template.

dosage compensation, by inactivation of X chromosome

Compensating for the two-fold variation in X-chromosome:autosome ratios between sexes by a global inactivation of all, or most of, the genes on one of the X-chromosomes in the XX sex.

Catalysis of the cleavage of a signal peptide from a protein precursor by an aspartic endopeptidase mechanism.

A semiautonomous, self replicating organelle that occurs in varying numbers, shapes, and sizes in the cytoplasm of virtually all eukaryotic cells. It is notably the site of tissue respiration.

transferase activity, transferring pentosyl groups

Catalysis of the transfer of a pentosyl group from one compound (donor) to another (acceptor).

transferase activity, transferring alkyl or aryl (other than methyl) groups

transferase activity, transferring alkyl or aryl groups, other than methyl groups

Catalysis of the transfer of an alkyl or aryl (but not methyl) group from one compound (donor) to another (acceptor).

Catalysis of the reaction: S-adenosylmethioninamine + spermidine = 5'-methylthioadenosine + spermine.