Terahara N, Krulwich TA, Ito M. Mutations alter the sodium versus proton use of a Bacillus clausii flagellar motor and confer dual ion use on Bacillus subtilis motors. Proc Natl Acad Sci U S A. 2008 Sep 23;105(38):14359-64.

Morino M, Natsui S, Swartz TH, Krulwich TA, Ito M. Single gene deletions of mrpA to mrpG and mrpE point mutations affect activity of the Mrp Na+/H+ antiporter of alkaliphilic Bacillus and formation of hetero-oligomeric Mrp complexes. J Bacteriol. 2008 Jun;190(12):4162-72.

Liu J, Krulwich TA, Hicks DB. Purification of two putative type II NADH dehydrogenases with different substrate specificities from alkaliphilic Bacillus pseudofirmus OF4. Biochim Biophys Acta. 2008 May;1777(5):453-61.

Fujinami S, Sato T, Trimmer JS, Spiller BW, Clapham DE, Krulwich TA, Kawagishi I, Ito M. The voltage-gated Na+ channel NaVBP co-localizes with methyl-accepting chemotaxis protein at cell poles of alkaliphilic Bacillus pseudofirmus OF4. Microbiology. 2007 Dec;153(Pt 12):4027-38.

Fujisawa M, Ito M, Krulwich TA. Three two-component transporters with channel-like properties have monovalent cation/proton antiport activity. Proc Natl Acad Sci U S A. 2007 Aug 14;104(33):13289-94

Wei Y, Liu J, Ma Y, Krulwich TA. Three putative cation/proton antiporters from the soda lake alkaliphile Alkalimonas amylolytica N10 complement an alkali-sensitive Escherichia coli mutant. Microbiology. 2007 Jul;153(Pt 7):2168-79.

Swartz TH, Ito M, Ohira T, Natsui S, Hicks DB, Krulwich TA. Catalytic properties of Staphylococcus aureus and Bacillus members of the secondary cation/proton antiporter-3 (Mrp) family are revealed by an optimized assay in an Escherichia coli host. J Bacteriol. 2007 Apr;189(8):3081-90.

Liu X, Gong X, Hicks DB, Krulwich TA, Yu L, Yu CA. Interaction between cytochrome caa3 and F1F0-ATP synthase of alkaliphilic Bacillus pseudofirmus OF4 is demonstrated by saturation transfer electron paramagnetic resonance and differential scanning calorimetry assays. Biochemistry. 2007 Jan 9;46(1):306-13.

Terahara N, Fujisawa M, Powers B, Henkin TM, Krulwich TA, Ito M. An intergenic stem-loop mutation in the Bacillus subtilis ccpA-motPS operon increases motPS transcription and the MotPS contribution to motility. J Bacteriol. 2006 Apr;188(7):2701-5.

Wei Y, Deikus G, Powers B, Shelden V, Krulwich TA, Bechhofer DH. Adaptive gene expression in Bacillus subtilis strains deleted for tetL. J Bacteriol. 2006 Oct;188(20):7090-100.

De Jesus M, Jin J, Guffanti AA, Krulwich TA. Importance of the GP Dipeptide of the Antiporter Motif and Other Membrane-Embedded Proline and Glycine Residues in Tetracycline Efflux Protein Tet(L). Biochemistry. 2005 Sep 27;44(38):12896-904.

Ito M, Terahara N, Fujinami S, Krulwich TA. Properties of motility in Bacillus subtilis powered by the H+-coupled MotAB flagellar stator, Na+-coupled MotPS or hybrid stators MotAS or MotPB. J Mol Biol. 2005 Sep 16;352(2):396-408.

Swartz TH, Ikewada S, Ishikawa O, Ito M, Krulwich TA. The Mrp system: a giant among monovalent cation/proton antiporters? Extremophiles. 2005 Oct;9(5):345-54.

Krulwich TA, Lewinson O, Padan E, Bibi E. Do physiological roles foster persistence of drug/multidrug-efflux transporters? A case study. Nat Rev Microbiol. 2005 Jul;3(7):566-72.

Rivera-Torres IO, Krueger-Koplin RD, Hicks DB, Cahill SM, Krulwich TA, Girvin ME. pKa of the essential Glu54 and backbone conformation for subunit c from the H+-coupled F1F0 ATP synthase from an alkaliphilic Bacillus. FEBS Lett. 2004 Sep 24;575(1-3):131-5.

Ito M, Hicks DB, Henkin TM, Guffanti AA, Powers BD, Zvi L, Uematsu K, Krulwich TA. MotPS is the stator-force generator for motility of alkaliphilic Bacillus, and its homologue is a second functional Mot in Bacillus subtilis. Mol Microbiol. 2004 Aug;53(4):1035-49.

Ito M, Xu H, Guffanti AA, Wei Y, Zvi L, Clapham DE, Krulwich TA. The voltage-gated Na+ channel NaVBP has a role in motility, chemotaxis, and pH homeostasis of an alkaliphilic Bacillus. Proc Natl Acad Sci U S A. 2004 Jul 20;101(29):10566-71.

Wang Z, Hicks DB, Guffanti AA, Baldwin K, Krulwich TA. Replacement of amino acid sequence features of a- and c-subunits of ATP synthases of Alkaliphilic Bacillus with the Bacillus consensus sequence results in defective oxidative phosphorylation and non-fermentative growth at pH 10.5. J Biol Chem. 2004 Jun 18;279(25):26546-54.

Krueger-Koplin RD, Sorgen PL, Krueger-Koplin ST, Rivera-Torres IO, Cahill SM, Hicks DB, Grinius L, Krulwich TA, Girvin ME. An evaluation of detergents for NMR structural studies of membrane proteins. J Biomol NMR. 2004 Jan;28(1):43-57.

Safferling M, Griffith H, Jin J, Sharp J, De Jesus M, Ng C, Krulwich TA, Wang DN. TetL tetracycline efflux protein from Bacillus subtilis is a dimer in the membrane and in detergent solution. Biochemistry. 2003 Dec 2;42(47):13969-76.

Wei Y, Southworth TW, Kloster H, Ito M, Guffanti AA, Moir A, Krulwich TA. Mutational loss of a K⁺ and NH₄⁺ transporter affects the growth and endospore formation of alkaliphilic Bacillus pseudofirmus OF4. J Bacteriol. 2003 Sep;185(17):5133-47.

Hicks DB, Wang Z, Wei Y, Kent R, Guffanti AA, Banciu H, Bechhofer DH, Krulwich TA. A tenth atp gene and the conserved atpI gene of a Bacillus atp operon have a role in Mg²⁺ uptake. Proc Natl Acad Sci U S A. 2003 Sep 2;100(18):10213-8.

Jin J, Guffanti AA, Bechhofer DH, Krulwich TA. Tet(L) and Tet(K) tetracycline-divalent metal/H⁺ antiporters: characterization of multiple catalytic modes and a mutagenesis approach to differences in their efflux substrate and coupling ion preferences. J Bacteriol. 2002 Sep;184(17):4722-32.

Jin J, Krulwich TA. Site-directed mutagenesis studies of selected motif and charged residues and of cysteines of the multifunctional tetracycline efflux protein Tet(L). J Bacteriol. 2002 Mar;184(6):1796-800.

Guffanti AA, Wei Y, Rood SV, Krulwich TA. An antiport mechanism for a member of the cation diffusion facilitator family: divalent cations efflux in exchange for K⁺ and H⁺. Mol Microbiol. 2002 Jul;45(1):145-53.

Southworth TW, Guffanti AA, Moir A, Krulwich TA. GerN, an endospore germination protein of Bacillus cereus , is an Na(+)/H(+)-K(+) antiporter. J Bacteriol. 2001 Oct;183(20):5896-903.

Ito M, Guffanti AA, Krulwich TA. Mrp-dependent Na(+)/H(+) antiporters of Bacillus exhibit characteristics that are unanticipated for completely secondary active transporters. FEBS Lett. 2001 May 11;496(2-3):117-20.

Krulwich TA, Jin J, Guffanti AA, Bechhofer H. Functions of tetracycline efflux proteins that do not involve tetracycline. J Mol Microbiol Biotechnol. 2001 Apr;3(2):237-46.

Jin J, Guffanti AA, Beck C, Krulwich TA. Twelve-transmembrane-segment (TMS) version (DTMS VII-VIII) of the 14-TMS Tet(L) antibiotic resistance protein retains monovalent cation transport modes but lacks tetracycline efflux capacity. J Bacteriol. 2001 Apr;183(8):2667-71.

Krulwich TA, Ito M, Guffanti AA. The Na(+)-dependence of alkaliphily in Bacillus. Biochim Biophys Acta. 2001 May 1;1505(1):158-68.

Gilmour R, Messner P, Guffanti AA, Kent R, Scheberl A, Kendrick N, Krulwich TA. Two dimensional gel electrophoresis analyses of pH-dependent protein expression in facultatively alkaliphilic Bacillus pseudofirmus OF4 lead to characterization of an S-layer protein with a role in alkaliphily. J Bacteriol. 2000 Nov;182(21):5969-81.

Ito M, Guffanti AA, Wang W, Krulwich TA. Effects of nonpolar mutations in each of the seven Bacillus subtilis mrp genes suggest complex interactions among the gene products in support of Na(+) and alkali but not cholate resistance. J Bacteriol. 2000 Oct;182(20):5663-70.

Wei Y, Guffanti AA, Ito M, Krulwich TA. Bacillus subtilis YqkI is a novel malic/Na⁺ lactate antiporter that enhances growth on malate at low protonmotive force. J Biol Chem. 2000 Sep 29;275(39):30287-92.

Wang W, Guffanti AA, Wei Y, Ito M, Krulwich TA. Two types of Bacillus subtilis tetA(L) deletion strains reveal the physiological importance of TetA(L) in K(+) acquisition as well as in Na(+), alkali, and tetracycline resistance. J Bacteriol. 2000 Apr;182(8):2088-95.