Ars operon
In molecular biology, the ars operon is an operon found in several bacterial taxon. It is required for the detoxification of arsenate, arsenite, and antimonite.[1] This system transports arsenite and antimonite out of the cell. The pump is composed of two polypeptides, the products of the arsA and arsB genes. This two-subunit enzyme produces resistance to arsenite and antimonite. Arsenate, however, must first be reduced to arsenite before it is extruded. A third gene, arsC, expands the substrate specificity to allow for arsenate pumping and resistance. ArsC is an approximately 150-residue arsenate reductase that uses reduced glutathione (GSH) to convert arsenate to arsenite with a redox active cysteine residue in the active site. ArsC forms an active quaternary complex with GSH, arsenate, and glutaredoxin 1 (Grx1). The three ligands must be present simultaneously for reduction to occur.[2]
| Anion-transporting ATPase | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Identifiers | |||||||||
| Symbol | ArsA_ATPase | ||||||||
| Pfam | PF02374 | ||||||||
| Pfam clan | CL0023 | ||||||||
| SCOPe | 1f48 / SUPFAM | ||||||||
| TCDB | 3.A.4 | ||||||||
| |||||||||
| ArsB | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Identifiers | |||||||||
| Symbol | ArsB | ||||||||
| Pfam | PF02040 | ||||||||
| Pfam clan | CL0182 | ||||||||
| InterPro | IPR000802 | ||||||||
| TCDB | 3.A.4 | ||||||||
| |||||||||
| ArsC | |||||||||
|---|---|---|---|---|---|---|---|---|---|
 yffb (pa3664) protein | |||||||||
| Identifiers | |||||||||
| Symbol | ArsC | ||||||||
| Pfam | PF03960 | ||||||||
| Pfam clan | CL0172 | ||||||||
| InterPro | IPR006660 | ||||||||
| SCOPe | 1i9d / SUPFAM | ||||||||
| |||||||||
| ArsD | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Identifiers | |||||||||
| Symbol | ArsD | ||||||||
| Pfam | PF06953 | ||||||||
| Pfam clan | CL0172 | ||||||||
| InterPro | IPR010712 | ||||||||
| |||||||||
ArsA and ArsB
ArsA and ArsB form an anion-translocating ATPase.[3] The ArsB protein is distinguished by its overall hydrophobic character, in keeping with its role as a membrane-associated channel. Sequence analysis reveals the presence of 13 putative transmembrane (TM) regions.
ArsC
The arsC protein structure has been solved.[4] It belongs to the thioredoxin superfamily fold which is defined by a beta-sheet core surrounded by alpha-helices. The active cysteine residue of ArsC is located in the loop between the first beta-strand and the first helix, which is also conserved in the Spx protein and its homologues.
The arsC family also comprises the Spx proteins which are Gram-positive bacterial transcription factors that regulate the transcription of multiple genes in response to disulphide stress.[5]
ArsD and ArsR
ArsD is a trans-acting repressor of the arsRDABC operon that confers resistance to arsenicals and antimonials in Escherichia coli. It possesses two-pairs of vicinal cysteine residues, Cys(12)-Cys(13) and Cys(112)-Cys(113), that potentially form separate binding sites for the metalloids that trigger dissociation of ArsD from the operon. However, as a homodimer it has four vicinal cysteine pairs.[6] The ArsD family consists of several bacterial arsenical resistance operon trans-acting repressor ArsD proteins.
ArsR is a trans-acting regulatory protein. It acts as a repressor on the arsRDABC operon when no arsenic is present in the cell. When arsenic is present in the cell ArsR will lose affinity for the operator and RNA polymerase can transcribe the arsDCAB genes.[7][8] ArsD and ArsR work together to regulate the ars operon.[9]
arsenic chaperone, ArsD, encoded by the arsRDABC operon of Escherichia coli. ArsD transfers trivalent metalloids to ArsA, the catalytic subunit of an As(III)/Sb(III) efflux pump. Interaction with ArsD increases the affinity of ArsA for arsenite, thus increasing its ATPase activity at lower concentrations of arsenite and enhancing the rate of arsenite extrusion.[10]
References
- Carlin A, Shi W, Dey S, Rosen BP (February 1995). "The ars operon of Escherichia coli confers arsenical and antimonial resistance". J. Bacteriol. 177 (4): 981–6. doi:10.1128/jb.177.4.981-986.1995. PMC 176692. PMID 7860609.
- Liu J, Rosen BP (August 1997). "Ligand interactions of the ArsC arsenate reductase". J. Biol. Chem. 272 (34): 21084–9. doi:10.1074/jbc.272.34.21084. PMID 9261111.
- Rosen BP (1990). "The plasmid-encoded arsenical resistance pump: an anion-translocating ATPase". Res Microbiol. 141 (3): 336–41. doi:10.1016/0923-2508(90)90008-e. PMID 1704144.
- Martin P, DeMel S, Shi J, Gladysheva T, Gatti DL, Rosen BP, Edwards BF (November 2001). "Insights into the structure, solvation, and mechanism of ArsC arsenate reductase, a novel arsenic detoxification enzyme". Structure. 9 (11): 1071–81. doi:10.1016/S0969-2126(01)00672-4. PMID 11709171.
- Zuber P (April 2004). "Spx-RNA polymerase interaction and global transcriptional control during oxidative stress". J. Bacteriol. 186 (7): 1911–8. doi:10.1128/jb.186.7.1911-1918.2004. PMC 374421. PMID 15028674.
- Li S, Rosen BP, Borges-Walmsley MI, Walmsley AR (July 2002). "Evidence for cooperativity between the four binding sites of dimeric ArsD, an As(III)-responsive transcriptional regulator". J. Biol. Chem. 277 (29): 25992–6002. doi:10.1074/jbc.M201619200. PMID 11980902.
- "Home - Springer".
- Xu C, Rosen BP (1997). "Dimerization is essential for DNA binding and repression by the ArsR metalloregulatory protein of Escherichia coli". J. Biol. Chem. 272 (25): 15734–8. doi:10.1074/jbc.272.25.15734. PMID 9188467.
- Chen, Yanxiang; Rosen, Barry P. (1997). "Metalloregulatory Properties of the ArsD Repressor". Journal of Biological Chemistry. 272 (22): 14257–14262. doi:10.1074/jbc.272.22.14257. PMID 9162059.
- Li X, Krumholz LR (2007). "Regulation of arsenate resistance in Desulfovibrio desulfuricans G20 by an arsRBCC operon and an arsC gene". J. Bacteriol. 189 (10): 3705–11. doi:10.1128/JB.01913-06. PMC 1913334. PMID 17337573.