1MOG

Crystal structure of H. salinarum dodecin

Summary for 1MOG

• Entry DOI: 10.2210/pdb1mog/pdb
• Descriptor: Dodecin, MAGNESIUM ION, SODIUM ION, ... (6 entities in total)
• Functional Keywords: binding site for dimerized riboflavin, 23-symmetric dodecamer, unknown function
• Biological source: Halobacterium salinarum
• Total number of polymer chains: 1
• Total formula weight: 7829.73

Authors

Bieger, B.,Essen, L.-O.,Oesterhelt, D. (deposition date: 2002-09-09, release date: 2003-04-15, Last modification date: 2024-02-14)

Primary citation

Bieger, B.,Essen, L.-O.,Oesterhelt, D.
Crystal Structure of Halophilic Dodecin: A Novel, Dodecameric Flavin Binding Protein from Halobacterium salinarum
Structure, 11:375-385, 2003

PubMed Abstract: A novel, 68 amino acid long flavoprotein called dodecin has been discovered in the proteome of Halobacterium salinarum by inverse structural genomics. The 1.7 A crystal structure of this protein shows a dodecameric, hollow sphere-like arrangement of the protein subunits. Unlike other known flavoproteins, which bind only monomeric flavin cofactors, the structure of the dodecin oligomer comprises six riboflavin dimers. The dimerization of these riboflavins along the re-faces is mediated by aromatic, antiparallel pi staggering of their isoalloxazine moieties. A unique aromatic tetrade is formed by further sandwiching of the riboflavin dimers between the indole groups of two symmetry-related Trp36s. So far, the dodecins represent the smallest known flavoproteins. Based on the structure and the wide spread occurrences in pathogenic and soil eubacteria, a function in flavin storage or protection against radical or oxygenic stress is suggested for the dodecins.

PubMed: 12679016
DOI: 10.1016/S0969-2126(03)00048-0

Experimental method

X-RAY DIFFRACTION (1.7 Å)