KtrA

• Description: high affinity potassium transporter KtrA-KtrB, peripheric membrane component (proton symport)
  
  

Gene name	ktrA
Synonyms	yuaA
Essential	no
Product	high affinity potassium transporter KtrA-KtrB, peripheric membrane component (proton symport)
Function	potassium uptake
Gene expression levels in SubtiExpress: ktrA
Interactions involving this protein in SubtInteract: KtrA
Metabolic function and regulation of this protein in SubtiPathways: Metal ion homeostasis, ktrA
MW, pI	24 kDa, 5.981
Gene length, protein length	666 bp, 222 aa
Immediate neighbours	bslA, ktrB
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

transporters/ other, metal ion homeostasis (K, Na, Ca, Mg), coping with hyper-osmotic stress, membrane proteins

This gene is a member of the following regulons

YdaO riboswitch

The gene

Basic information

• Locus tag: BSU31090

Phenotypes of a mutant

• The ktrA-ktrB mutant of B. subtilis NCIB3610 is reduced in sliding (dendritic spreading) PubMed

Database entries

• BsubCyc: BSU31090

• DBTBS entry: no entry

• SubtiList entry: [1]

The protein

Basic information/ Evolution

• Catalyzed reaction/ biological activity:

• Protein family:

• Paralogous protein(s): KtrC

Extended information on the protein

• Kinetic information:

• Domains:
  • contains a RCK_N domain at the N-terminus (according to UniProt, [2])
  • contains a RCK_C domain at the C-terminus (according to UniProt, [3])

• Modification:

• Cofactors:

• Effectors of protein activity:

• Interactions:
  • KtrA-KtrB PubMed, composed of an octameric KtrA ring and two KtrB dimers PubMed

• Localization: peripheral membrane protein PubMed

Database entries

• BsubCyc: BSU31090

• Structure:
  • 1LSU (complex with NADH)
  • 2HMW ( complex with ATP)
  • 4J7C (the KtrA-KtrB complex) PubMed

• UniProt: O32080

• KEGG entry: [4]

• E.C. number:

Expression and regulation

• Operon: ktrA-ktrB PubMed

• Expression browser: ktrA PubMed

• Sigma factor:

• Regulation:

• Regulatory mechanism:
  • expression is controlled via termination antitermination by the ydaO riboswitch, expression is switched off upon binding of c-di-AMP PubMed

• Additional information:

Biological materials

• Mutant:
  • 1A954 ( ktrA::kan), PubMed, available at BGSC
  • GHB1 (D(ktrA-ktrB)::aphA3), available in Erhard Bremer's lab
  • GP92 (D(ktrA-ktrB)::aphA3), available in Jörg Stülke's lab

• Expression vector:
  • pGP2594: (IPTG inducible expression, purification in E. coli with N-terminal His-tag, in pWH844), available in Jörg Stülke's lab

• lacZ fusion:

• GFP fusion:

• two-hybrid system:

• Antibody:

Labs working on this gene/protein

Erhard Bremer, University of Marburg, Germany homepage

References

Reviews

Fabian M Commichau, Achim Dickmanns, Jan Gundlach, Ralf Ficner, Jörg Stülke
A jack of all trades: the multiple roles of the unique essential second messenger cyclic di-AMP.
Mol Microbiol: 2015, 97(2);189-204
[PubMed:25869574] [WorldCat.org] [DOI] (I p)

Original publications

Henna Kim, Suk-Jun Youn, Seong Ok Kim, Junsang Ko, Jie-Oh Lee, Byong-Seok Choi
Structural Studies of Potassium Transport Protein KtrA Regulator of Conductance of K+ (RCK) C Domain in Complex with Cyclic Diadenosine Monophosphate (c-di-AMP).
J Biol Chem: 2015, 290(26);16393-402
[PubMed:25957408] [WorldCat.org] [DOI] (I p)

James W Nelson, Narasimhan Sudarsan, Kazuhiro Furukawa, Zasha Weinberg, Joy X Wang, Ronald R Breaker
Riboswitches in eubacteria sense the second messenger c-di-AMP.
Nat Chem Biol: 2013, 9(12);834-9
[PubMed:24141192] [WorldCat.org] [DOI] (I p)

Ricardo S Vieira-Pires, Andras Szollosi, João H Morais-Cabral
The structure of the KtrAB potassium transporter.
Nature: 2013, 496(7445);323-8
[PubMed:23598340] [WorldCat.org] [DOI] (I p)

Peter Y Watson, Martha J Fedor
The ydaO motif is an ATP-sensing riboswitch in Bacillus subtilis.
Nat Chem Biol: 2012, 8(12);963-5
[PubMed:23086297] [WorldCat.org] [DOI] (I p)

Kirsten F Block, Ming C Hammond, Ronald R Breaker
Evidence for widespread gene control function by the ydaO riboswitch candidate.
J Bacteriol: 2010, 192(15);3983-9
[PubMed:20511502] [WorldCat.org] [DOI] (I p)

Ronald A Albright, José-Luís Vazquez Ibar, Chae Un Kim, Sol M Gruner, João Henrique Morais-Cabral
The RCK domain of the KtrAB K+ transporter: multiple conformations of an octameric ring.
Cell: 2006, 126(6);1147-59
[PubMed:16990138] [WorldCat.org] [DOI] (P p)

Rebecca F Kinsinger, Daniel B Kearns, Marina Hale, Ray Fall
Genetic requirements for potassium ion-dependent colony spreading in Bacillus subtilis.
J Bacteriol: 2005, 187(24);8462-9
[PubMed:16321950] [WorldCat.org] [DOI] (P p)

Jeffrey E Barrick, Keith A Corbino, Wade C Winkler, Ali Nahvi, Maumita Mandal, Jennifer Collins, Mark Lee, Adam Roth, Narasimhan Sudarsan, Inbal Jona, J Kenneth Wickiser, Ronald R Breaker
New RNA motifs suggest an expanded scope for riboswitches in bacterial genetic control.
Proc Natl Acad Sci U S A: 2004, 101(17);6421-6
[PubMed:15096624] [WorldCat.org] [DOI] (P p)

Gudrun Holtmann, Evert P Bakker, Nobuyuki Uozumi, Erhard Bremer
KtrAB and KtrCD: two K+ uptake systems in Bacillus subtilis and their role in adaptation to hypertonicity.
J Bacteriol: 2003, 185(4);1289-98
[PubMed:12562800] [WorldCat.org] [DOI] (P p)