Abstract
The PII-like protein SbtB has been identified as a regulator of SbtA, which is one of the key bicarbonate transporters in cyanobacteria. While SbtB from Synechocystis sp. PCC 6803 has previously been shown to be a trimer, a new crystal form is reported here which crystallizes in what is thought to be a non-native tetramer in the crystal, with the C-terminus in an extended conformation. The crystal structure shows the formation of an intermolecular disulfide bond at Cys94 between SbtB monomers, which may stabilize this conformation in the crystal. This motivates the need for future studies to investigate the potential role that the oxidation and reduction of these cysteines may play in the activation and/or function of SbtB.
Original language | English (US) |
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Pages (from-to) | 438-443 |
Number of pages | 6 |
Journal | Acta Crystallographica Section F: Structural Biology and Crystallization Communications |
Volume | 76 |
DOIs | |
State | Published - Sep 1 2020 |
Keywords
- SbtB
- Synechocystis
- bicarbonate transport
- cyanobacteria
ASJC Scopus subject areas
- Biophysics
- Structural Biology
- Biochemistry
- Genetics
- Condensed Matter Physics
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Tetragonal crystal form of SbtB from Synechocystis PCC6803
Bu, G. (Contributor), Simmons, C. R. (Contributor), Nielsen, D. (Contributor) & Nannenga, B. (Contributor), Protein Data Bank (PDB), Aug 26 2020
DOI: 10.2210/pdb6WUE, https://www.wwpdb.org/pdb?id=pdb_00006wue
Dataset