Term: rubredoxin https://doi.org/10.1351/goldbook.RT06793 Definition: An iron-sulfur protein without acid-labile sulfur, in which an iron centre is coordinated by four sulfur-containing ligands, usually cysteine. The function, where known, is an electron carrier. Related Terms: 1) iron-sulfur protein (http://doi.org/10.1351/goldbook.IT06780). 2) acid-labile sulfur (http://doi.org/10.1351/goldbook.AT06794). 3) coordinated (http://doi.org/10.1351/goldbook.C01329). 4) ligands (http://doi.org/10.1351/goldbook.L03518). 5) carrier (http://doi.org/10.1351/goldbook.C00859). Source: PAC, 1997, 69, 1251. 'Glossary of terms used in bioinorganic chemistry (IUPAC Recommendations 1997)' on page 1296 (https://doi.org/10.1351/pac199769061251) Citation: 'rubredoxin' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. https://doi.org/10.1351/goldbook.RT06793 License: The IUPAC Gold Book is licensed under Creative Commons Attribution-ShareAlike CC BY-SA 4.0 International (https://creativecommons.org/licenses/by-sa/4.0/) for individual terms. Disclaimer: The International Union of Pure and Applied Chemistry (IUPAC) is continuously reviewing and, where needed, updating terms in the Compendium of Chemical Terminology (the IUPAC Gold Book). Users of these terms are encouraged to include the version of a term with its use and to check regularly for updates to term definitions that you are using.