Metal-Sulfur clusters play an essential role in living organisms through the unique character of sulfur-metal bonding. The new volume in prestigious Metal Ions in Life Sciences explores different transition metal complexes with sulfur, their biosynthesis and biological functions in regulation of gene expression, catalysis of important metabolic reactions and protein structure arrangement.

• About the Editors
• Historical Development and Perspectives of the Series. Metal Ions in Life Sciences*
• Preface to Volume 20. Transition Metals and Sulfur: A Strong Relationship for Life
• Contents
• Contributors to Volume 20
• Titles of Volumes 1–44 in the Metal Ions in Biological Systems Series
• Contents of Volumes in the Metal Ions in Life Sciences Series
• 1. Introduction: Transition Metals and Sulfur
• 2. Sulfur, the Versatile Non-metal
• 3. The Type 1 Blue Copper Site: From Electron Transfer to Biological Function
• 4. Purple Mixed-Valent Copper A
• 5. The Tetranuclear Copper-Sulfide Center of Nitrous Oxide Reductase
• 6. Cytochrome P₄₅₀. The Dioxygen-Activating Heme Thiolate
• 7. Basic Iron-Sulfur Centers
• 8. The Cofactors of Nitrogenases
• 9. Molybdenum and Tungsten Cofactors and the Reactions They Catalyze
• 10. The Siroheme-[4Fe-4S] Coupled Center
• 11. Nickel, Iron, Sulfur Sites
• 12. Zinc Fingers
• SUBJECT INDEX