Mechanism of tumor resistance to cisplatin mediated by the copper transporter ATP7BThis paper is one of a selection of papers published in a Special Issue entitled CSBMCB 53rd Annual Meeting — Membrane Proteins in Health and Disease, and has undergone the Journal’s usual peer review process.

2011 ◽  
Vol 89 (2) ◽  
pp. 138-147 ◽  
Author(s):  
Oleg Y. Dmitriev
Keyword(s):  
Metal Binding ◽  
Peer Review Process ◽  
Alternative Mechanism ◽  
Copper Binding ◽  
Cancer Resistance ◽  
Tumor Resistance ◽  
Copper Transporter ◽  
Metal Binding Domain ◽  
Disease Protein

The Wilson disease protein (ATP7B) is a copper-transporting ATPase that is responsible for regulating copper homeostasis in human tissues. ATP7B is associated with cancer resistance to cisplatin, one of the most widely used anticancer drugs. This minireview discusses the possible mechanisms of tumor resistance to cisplatin mediated by ATP7B. Cisplatin binds to the N-terminal cytosolic domain of ATP7B, which contains multiple copper-binding sites. Active platinum efflux catalyzed by ATP7B is unlikely to significantly contribute to cisplatin resistance in vivo. Transient platinum sequestration in the metal-binding domain followed by transfer to an acceptor protein or a low molecular weight compound is proposed as an alternative mechanism of cisplatin detoxification in the cell.

scholarly journals The soluble metal-binding domain of the copper transporter ATP7B binds and detoxifies cisplatin

2009 ◽  
Vol 419 (1) ◽  
pp. 51-59 ◽  
Author(s):  
Nataliya V. Dolgova ◽  
Doug Olson ◽  
Svetlana Lutsenko ◽  
Oleg Y. Dmitriev
Keyword(s):  
Metal Binding ◽  
Binding Sites ◽  
Active Drug ◽  
Binding Domain ◽  
Copper Binding ◽  
Protein Fragment ◽  
Copper Transporter ◽  
Metal Binding Domain ◽  
Cell Expression

Wilson disease ATPase (ATP7B) has been implicated in the resistance of cancer cells to cisplatin. Using a simple in vivo assay in bacterial culture, in the present study we demonstrate that ATP7B can confer resistance to cisplatin by sequestering the drug in its N-terminal metal-binding domain without active drug extrusion from the cell. Expression of a protein fragment containing four N-terminal MBRs (metal-binding repeats) of ATP7B (MBR1–4) protects cells from the toxic effects of cisplatin. One MBR1–4 molecule binds up to three cisplatin molecules at the copper-binding sites in the MBRs. The findings of the present study suggest that suppressing enzymatic activity of ATP7B may not be an effective way of combating cisplatin resistance. Rather, the efforts should be directed at preventing cisplatin binding to the protein.

Copper chaperone Atox1 interacts with the metal-binding domain of Wilson's disease protein in cisplatin detoxification

2013 ◽  
Vol 454 (1) ◽  
pp. 147-156 ◽  
Author(s):  
Nataliya V. Dolgova ◽  
Sergiy Nokhrin ◽  
Corey H. Yu ◽  
Graham N. George ◽  
Oleg Y. Dmitriev
Keyword(s):  
Metal Binding ◽  
Wilson’S Disease ◽  
Wilson's Disease ◽  
Binding Domain ◽  
Binding Motif ◽  
Copper Chaperone ◽  
Copper Binding ◽  
Copper Transporters ◽  
Metal Binding Domain ◽  
Disease Protein

Human copper transporters ATP7B (Wilson's disease protein) and ATP7A (Menkes' disease protein) have been implicated in tumour resistance to cisplatin, a widely used anticancer drug. Cisplatin binds to the copper-binding sites in the N-terminal domain of ATP7B, and this binding may be an essential step of cisplatin detoxification involving copper ATPases. In the present study, we demonstrate that cisplatin and a related platinum drug carboplatin produce the same adduct following reaction with MBD2 [metal-binding domain (repeat) 2], where platinum is bound to the side chains of the cysteine residues in the CxxC copper-binding motif. This suggests the same mechanism for detoxification of both drugs by ATP7B. Platinum can also be transferred to MBD2 from copper chaperone Atox1, which was shown previously to bind cisplatin. Binding of the free cisplatin and reaction with the cisplatin-loaded Atox1 produce the same protein-bound platinum intermediate. Transfer of platinum along the copper-transport pathways in the cell may serve as a mechanism of drug delivery to its target in the cell nucleus, and explain tumour-cell resistance to cisplatin associated with the overexpression of copper transporters ATP7B and ATP7A.

scholarly journals Iron is a ligand of SecA-like metal-binding domains in vivo

2020 ◽  
Vol 295 (21) ◽  
pp. 7516-7528
Author(s):  
Tamar Cranford-Smith ◽  
Mohammed Jamshad ◽  
Mark Jeeves ◽  
Rachael A. Chandler ◽  
Jack Yule ◽  
...  
Keyword(s):  
Sodium Azide ◽  
Metal Binding ◽  
Cytoplasmic Membrane ◽  
E Coli ◽  
Binding Domains ◽  
Equilibrium Binding ◽  
Plausible Model ◽  
Metal Binding Domain ◽  
Linker Domain

The ATPase SecA is an essential component of the bacterial Sec machinery, which transports proteins across the cytoplasmic membrane. Most SecA proteins contain a long C-terminal tail (CTT). In Escherichia coli, the CTT contains a structurally flexible linker domain and a small metal-binding domain (MBD). The MBD coordinates zinc via a conserved cysteine-containing motif and binds to SecB and ribosomes. In this study, we screened a high-density transposon library for mutants that affect the susceptibility of E. coli to sodium azide, which inhibits SecA-mediated translocation. Results from sequencing this library suggested that mutations removing the CTT make E. coli less susceptible to sodium azide at subinhibitory concentrations. Copurification experiments suggested that the MBD binds to iron and that azide disrupts iron binding. Azide also disrupted binding of SecA to membranes. Two other E. coli proteins that contain SecA-like MBDs, YecA and YchJ, also copurified with iron, and NMR spectroscopy experiments indicated that YecA binds iron via its MBD. Competition experiments and equilibrium binding measurements indicated that the SecA MBD binds preferentially to iron and that a conserved serine is required for this specificity. Finally, structural modeling suggested a plausible model for the octahedral coordination of iron. Taken together, our results suggest that SecA-like MBDs likely bind to iron in vivo.

scholarly journals The C-terminal tail of the bacterial translocation ATPase SecA modulates its activity

2018 ◽  
Author(s):  
Mohammed Jamshad ◽  
Timothy J. Knowles ◽  
Scott A. White ◽  
Douglas G. Ward ◽  
Fiyaz Mohammed ◽  
...  
Keyword(s):  
Conformational Changes ◽  
Metal Binding ◽  
Cytoplasmic Membrane ◽  
Protein Recognition ◽  
X Ray ◽  
Ribosome Binding ◽  
X Ray Crystallography ◽  
Substrate Protein ◽  
Metal Binding Domain

AbstractIn bacteria, the translocation of a subset of proteins across the cytoplasmic membrane by the Sec machinery requires SecA. Although SecA can recognise nascent polypeptides, the mechanism of cotranslational substrate protein recognition is not known. Here, we investigated the role of the C-terminal tail (CTT) of SecA, which consists of a flexible linker (FLD) and a small metal-binding domain (MBD), in its interaction with nascent polypeptides. Phylogenetic analysis and ribosome binding experiments indicated that the MBD interacts with 70S ribosomes. Disruption of the entire CTT or the MBD alone had opposing effects on ribosome binding, substrate-protein binding, ATPase activity and in vivo function. Autophotocrosslinking, mass spectrometry, x-ray crystallography and small-angle x-ray scattering experiments provided insight into the CTT-mediated conformational changes in SecA. Finally, photocrosslinking experiments indicated that binding of SecA to substrate protein affected its interaction with the ribosome. Taken together, our results suggest a mechanism for substrate protein recognition.Impact StatementSecA is an evolutionarily conserved ATPase that is required for the translocation of a subset of proteins across the cytoplasmic membrane in bacteria. We investigated how SecA recognises its substrate proteins at the ribosome as they are still being synthesised (i.e. cotranslationally).

Expression, purification and copper-binding studies of the first metal-binding domain of Menkes protein

1999 ◽  
Vol 264 (3) ◽  
pp. 890-896 ◽  
Author(s):  
Pia Y. Jensen ◽  
Nicklas Bonander ◽  
Nina Horn ◽  
Zeynep Tumer ◽  
Ole Farver
Keyword(s):  
Metal Binding ◽  
Binding Domain ◽  
Copper Binding ◽  
Binding Studies ◽  
Metal Binding Domain ◽  
Menkes Protein

scholarly journals A Mutation in the PP2C Phosphatase Gene in a Staphylococcus aureus USA300 Clinical Isolate with Reduced Susceptibility to Vancomycin and Daptomycin

2012 ◽  
Vol 56 (10) ◽  
pp. 5212-5223 ◽  
Author(s):  
Karla D. Passalacqua ◽  
Sarah W. Satola ◽  
Emily K. Crispell ◽  
Timothy D. Read
Keyword(s):  
Staphylococcus Aureus ◽  
Metal Binding ◽  
De Novo ◽  
Surface Protein ◽  
Complex Nature ◽  
Insertion Mutation ◽  
Content Type ◽  
Metal Binding Domain ◽  
Multiple Routes

ABSTRACTMethicillin-resistantStaphylococcus aureus(MRSA) strains with reduced susceptibility to vancomycin (MIC of 4 to 8 μg/ml) are referred to as vancomycin-intermediateS. aureus(VISA). In this study, we characterized two isogenic USA300S. aureusisolates collected sequentially from a single patient with endocarditis where theS. aureusisolate changed from being susceptible to vancomycin (VSSA) (1 μg/ml) to VISA (8 μg/ml). In addition, the VISA isolate lost beta-lactamase activity and showed increased resistance to daptomycin and linezolid. The two strains did not differ in growth rate, but the VISA isolate had a thickened cell wall and was less autolytic. Transcriptome sequencing (RNA-seq) analysis comparing the two isolates grown to late exponential phase showed significant differences in transcription of cell surface protein genes (spa, SBI [second immunoglobulin-binding protein ofS. aureus], and fibrinogen-binding proteins), regulatory genes (agrBCA, RNAIII,sarT, andsaeRS), and others. Using whole-genome shotgun resequencing, we identified 6 insertion/deletion mutations between the VSSA and VISA isolates. A protein phosphatase 2C (PP2C) family phosphatase had a 6-bp (nonframeshift) insertion mutation in a highly conserved metal binding domain. Complementation of the clinical VISA isolate with a wild-type copy of the PP2C gene reduced the vancomycin and daptomycin MICs and increased autolytic activity, suggesting that this gene contributed to the reduced vancomycin susceptibility phenotype acquiredin vivo. Creation ofde novomutants from the VSSA strain resulted in different mutations, demonstrating that reduced susceptibility to vancomycin in USA300 strains can occur via multiple routes, highlighting the complex nature of the VISA phenotype.

Copper-Transfer Mechanism from the Human Chaperone Atox1 to a Metal-Binding Domain of Wilson Disease Protein

2010 ◽  
Vol 114 (10) ◽  
pp. 3698-3706 ◽  
Author(s):  
Agustina Rodriguez-Granillo ◽  
Alejandro Crespo ◽  
Dario A. Estrin ◽  
Pernilla Wittung-Stafshede
Keyword(s):  
Metal Binding ◽  
Wilson Disease ◽  
Binding Domain ◽  
Transfer Mechanism ◽  
Wilson Disease Protein ◽  
Metal Binding Domain ◽  
Disease Protein ◽  
Copper Transfer

scholarly journals Cellular glutathione plays a key role in copper uptake mediated by human copper transporter 1

2013 ◽  
Vol 304 (8) ◽  
pp. C768-C779 ◽  
Author(s):  
Edward B. Maryon ◽  
Shannon A. Molloy ◽  
Jack H. Kaplan
Keyword(s):  
Initial Rate ◽  
Hek293 Cells ◽  
Binding Motif ◽  
Copper Binding ◽  
Experimental Conditions ◽  
Copper Transporter ◽  
Copper Chaperones ◽  
Copper Transporter 1 ◽  
Cu Uptake

Copper is an essential micronutrient. Following entry via the human copper transporter 1 (hCTR1), copper is delivered to several copper chaperones, which subsequently transfer the metal to specific targets via protein:protein interactions. It is has been assumed, but not demonstrated, that chaperones acquire copper directly from hCTR1. However, some reports have pointed to an intermediary role for glutathione (GSH), an abundant copper-binding tri-peptide. To address the issue of how transported copper is acquired by the copper chaperones in vivo, we measured the initial rate of64Cu uptake in cells in which the cellular levels of copper chaperones or GSH were substantially depleted or elevated. Knockdown or overexpression of copper chaperones ATOX1, CCS, or both had no effect on the initial rate of64Cu entry into HEK293 cells having endogenous or overexpressed hCTR1. In contrast, depleting cellular GSH using l-buthionine-sulfoximine (BSO) caused a 50% decrease in the initial rate of64Cu entry in HEK293 cells and other cell types. This decrease was reversed by washout of BSO or GSH replenishment with a permeable ester. BSO treatment under our experimental conditions had no significant effects on the viability, ATP levels, or metal content of the cells. Attenuated64Cu uptake in BSO was not due to oxidation of the cysteine in the putative metal-binding motif (HCH) at the intracellular hCTR1 COOH terminus, because a mutant lacking this motif was fully active, and64Cu uptake was still reduced by BSO treatment. Our data suggest that GSH plays an important role in copper handling at the entry step.

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