Open Access Research article

The Escherichia coli uropathogenic-specific-protein-associated immunity protein 3 (Imu3) has nucleic acid -binding activity

Miha Črnigoj, Zdravko Podlesek, Maruška Budič and Darja Žgur-Bertok*

Author Affiliations

Department of Biology, Biotechnical Faculty, University of Ljubljana, Ljubljana, Slovenia

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BMC Microbiology 2014, 14:16  doi:10.1186/1471-2180-14-16

Published: 28 January 2014

Additional files

Additional file 1: Figure S1:

Effect of His-tag presence on Imu3 DNA-binding ability. M: PageRuler Prestained Protein Ladder (Fermentas); 1. Imu3 with His-tag (SDS-PAGE); 2. Imu3 with His-tag removed (SDS-PAGE); 3. 100 ng of pUC19/EcoRI (agarose electrophoresis, AE); 4. 100 ng of pUC19/EcoRI complexed with Imu3 with His-tag removed (AE).

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Additional file 2: Figure S2:

Dimerisation of Imu3 and USP proteins, 10% SDS PAGE gel. M: PageRuler Prestained Protein Ladder (Fermentas); 1. Imu3 protein (11.5 kDa); 2. USP protein (67 kDa). Samples following cross-linking with glutaraldehyde (3-7); 3. Imu3 protein, 4. USP protein, 5. Imu3 and USP, 6. Imu3 and USP with addition of DNA, 7. LexA protein mono/dimer (24/48 kDa).

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Additional file 3: Figure S3:

Representative electromobility shift assays on 0.8% agarose gels. Effects of pH, NaCl and temperature on DNA–Imu3 complex relaxation. Lane 1: pUC19/EcoRI DNA (100 ng); lane 2: Imu3-pUC19/EcoRI untreated complex; lanes 3-7: Imu3-pUC19/EcoRI complex treated with pH values 10, 11, 12, 12.5, 13; lanes 8-11: Imu3-pUC19/EcoRI complex incubated 5 min at 100°C in the presence 0, 0.2, 0.5 and 1 M NaCl; lanes 12-14: complex treated with 0, 0.5 and 1 M NaCl at pH 12.

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Additional file 4: Figure S4:

DNA precipitation from diluted systems. On agarose gel: 1. pUC19/EcoRI (100 ng); 2. pUC19/EcoRI purified with GeneJet PCR purification Kit (Fermentas); 3. 100 ng of pUC19/EcoRI diluted 1.5 × 10-4 in 15 mL buffer and salvaged with Imu3 precipitation and subsequent GeneJet PCR purification Kit Imu3 removal.

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