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Ribonucleoside-diphosphate reductase variant 1 Overview

GO Annotations consist of four mandatory components: a gene product, a term from one of the three Gene Ontology (GO) controlled vocabularies (Molecular Function, Biological Process, and Cellular Component), a reference, and an evidence code.

Summary
Catalyzes the reduction of ribonucleotides to the corresponding deoxyribonucleotides, an essential step in the de novo synthesis of monomeric precursors for DNA replication and repair. The catalytically active form is an alpha2beta2 tetramer. The homodimeric alpha subunit, called R1, houses the active site, composed of redox-active disulfides, and binding sites for allosteric effectors, ribonucleoside diphosphates. The beta subunit, called R2, contains a di-iron cluster that in its reduced state reacts with dioxygen to form a stable tyrosyl radical (Y*) and a di-iron(III) cluster. This essential Y* is proposed to generate a thiyl radical, located on a cysteine residue in the R1 active site, that initiates ribonucleotide reduction. The enzyme is allosterically controlled by relative levels of dNTPs. This variant is found in all cell states, a related variant (CPX-1103) is only found in damaged or growth-arrested cells. the small subunit, RNR2-RNR4, is nuclear while the large subunit, RNR1, is cytoplasmic. In response to S-phase or DNA-damage, RNR2-RNR4 enters the cytoplasm to bind RNR1.
GO Slim Terms

The yeast GO Slim terms are higher level terms that best represent the major S. cerevisiae biological processes, functions, and cellular components. The GO Slim terms listed here are the broader parent terms for the specific terms to which this gene product is annotated, and thus represent the more general processes, functions, and components in which it is involved.

ion binding, oxidoreductase activity, biosynthetic process, nucleobase-containing small molecule metabolic process, small molecule metabolic process, cytoplasm

Biological Process

Manually curated GO annotations reflect our best understanding of the basic biological process for this protein complex. Manually curated annotations are assigned by curators based on published papers when available, or by curatorial statements if necessary. Curators periodically review all manually curated GO annotations for accuracy and completeness.

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Qualifier Gene Ontology Term Annotation Extension Evidence Source Assigned On Reference

Molecular Function

Manually curated GO annotations reflect our best understanding of the basic molecular function for this protein complex. Manually curated annotations are assigned by curators based on published papers when available, or by curatorial statements if necessary. Curators periodically review all manually curated GO annotations for accuracy and completeness.

Increase the total number of rows showing on this page using the pull-down located below the table, or use the page scroll at the table's top right to browse through the table's pages; use the arrows to the right of a column header to sort by that column; filter the table using the "Filter" box at the top of the table.

Qualifier Gene Ontology Term Annotation Extension Evidence Source Assigned On Reference

Cellular Component

Manually curated GO annotations reflect our best understanding of the basic cellular component for this protein complex. Manually curated annotations are assigned by curators based on published papers when available, or by curatorial statements if necessary. Curators periodically review all manually curated GO annotations for accuracy and completeness.

Increase the total number of rows showing on this page using the pull-down located below the table, or use the page scroll at the table's top right to browse through the table's pages; use the arrows to the right of a column header to sort by that column; filter the table using the "Filter" box at the top of the table.

Qualifier Gene Ontology Term Annotation Extension Evidence Source Assigned On Reference

Shared Annotations

This diagram displays Gene Ontology terms (green) that are shared between the given macromolecular complex (black) and other yeast complexes (yellow). Note: No diagram is shown ("No shared annotations") if there are less than 2 shared GO annotations between this complex and any other complexes.