SdhB

• Description: succinate dehydrogenase
  
  

Gene name	sdhB
Synonyms
Essential	no
Product	succinate dehydrogenase (iron-sulfur protein)
Function	TCA cycle
Gene expression levels in SubtiExpress: sdhB
Interactions involving this protein in SubtInteract: SdhB
Metabolic function and regulation of this protein in SubtiPathways: sdhB
MW, pI	28 kDa, 7.989
Gene length, protein length	759 bp, 253 aa
Immediate neighbours	ysmA, sdhA
Sequences	Protein DNA DNA_with_flanks
Genetic context This image was kindly provided by SubtiList
Expression at a glance   PubMed

Categories containing this gene/protein

carbon core metabolism, membrane proteins

This gene is a member of the following regulons

FsrA regulon

The gene

Basic information

• Locus tag: BSU28430

Database entries

• DBTBS entry: [1]

• SubtiList entry: [2]

The protein

Basic information/ Evolution

• Catalyzed reaction/ biological activity: Succinate + acceptor = fumarate + reduced acceptor (according to Swiss-Prot)

• Protein family: succinate dehydrogenase/fumarate reductase iron-sulfur protein family (according to Swiss-Prot)

• Paralogous protein(s):

Extended information on the protein

• Kinetic information:

• Domains:

• Modification:

• Cofactor(s): Fe

• Effectors of protein activity:
  • Inhibited by 2-(n-Heptyl)-4-hydroxy-quinoline N-oxide PubMed
  • Activated by Cytochrome b558 PubMed

• Interactions:
  • SdhA-SdhB, SdhB-SdhC (as part of the SdhC-SdhB-SdhA complex)
  • part of a respiratory supercomplex PubMed

• Localization:
  • attached to the membrane PubMed

Database entries

• Structure: 1NEK (E. coli)

• UniProt: P08066

• KEGG entry: [3]

• E.C. number:EC 1.3.99.1

Additional information

• This enzyme is a trimer membrane-bound PubMed PubMed
  • One subunit is bound to citochrome b558, and this subunit is the one bound to the cytosolic side of the membrane PubMed PubMed
  • Another subunit is the flavoprotein one, required for FAD usage PubMed PubMed
  • The other subunit has an iron-sulphur domain necessary for the catalytic activity PubMed PubMed
• extensive information on the structure and enzymatic properties of succinate dehydrogenase can be found at Proteopedia

Expression and regulation

• Operon: sdhC-sdhA-sdhB PubMed

• Expression browser: sdhB PubMed

• Sigma factor: SigA PubMed

• Regulation: constitutive
  • part of the iron sparing response (FsrA) PubMed

• Regulatory mechanism:
  • FsrA: translation inhibition PubMed

• Additional information:

Biological materials

• Mutant:
  • GP792 (sdhC-sdhA-sdhB::phleo), available in Jörg Stülke's lab

• Expression vector:

• lacZ fusion:

• GFP fusion: GP1436 (spc, based on pGP1870), available in the Stülke lab

• two-hybrid system: B. pertussis adenylate cyclase-based bacterial two hybrid system (BACTH), available in Stülke lab

• Antibody:

• FLAG-tag construct: GP1426 (spc, based on pGP1331), available in the Stülke lab