Assessment of Intracellular Growth of Coxiella Mutants within Eukaryotic Cells

Abstract

Source: Martinez, E. et al., Generation and Multi-phenotypic High-content Screening of Coxiella burnetii Transposon Mutants. J. Vis. Exp. (2015)

This video demonstrates a method for assessing the intracellular growth of GFP-tagged Coxiella mutants within cultured epithelial cells. The mutant phenotype is visualized using immunostaining and epifluorescence microscopy, allowing the study of the effect of the mutation on intracellular growth.

Protocol

1. Generation of a library of green fluorescence protein, GFP-tagged Coxiella transposon mutants Manipulate Coxiella burnetii RSA439 NMII in a biosafety containment level 2 (BSL-2) in a microbial safety cabinet (MSC) in compliance with local rules. If compatible with the bacterial model used, repeat steps from 1.4.1 to 1.4.4 to increase the probability of obtaining clonal mutants. A typical mutant library is composed (at least) of a number o…

Materials

Citric acid	Sigma	C0759-500G	ACCM-2 medium component
Sodium citrate	Sigma	S4641-500G	ACCM-2 medium component
Potassium phosphate	Sigma	60218-100G	ACCM-2 medium component
Magnesium chloride	Sigma	M2670-100G	ACCM-2 medium component
Calcium chloride	Sigma	C5080-500G	ACCM-2 medium component
Iron sulfate	Sigma	F8633-250G	ACCM-2 medium component
Sodium chloride	Sigma	S9625-500G	ACCM-2 medium component
L-cysteine	Sigma	C6852-25G	ACCM-2 medium component
Bacto Neopeptone	BD (Beckton-Dickinson)	211681	ACCM-2 medium component
Casamino acids	BD (Beckton-Dickinson)	223050	ACCM-2 medium component
Methyl-B-Cyclodextrin	Sigma	C4555-10G	ACCM-2 medium component
RPMI w/glutamax	Gibco	61870-010	ACCM-2 medium component
RPMI w/glutamax, without phenol red	Gibco	32404-014	For cell culture and infection
Fetal Bovine Serum	GE healthcare	SH30071	For cell culture
Trypsin EDTA (0.25%)	Life Technologies	25200-056	For cell culture
Saponin	Sigma	47036	For immunofluorescence staining
Ammonium chloride	Sigma	A9434	For immunofluorescence staining
Bovine Serum Albumine	Sigma	A2153	For immunofluorescence staining
Electroporation cuvette 0.1 cm	Eurogentec	ce0001-50	For Coxiella transformation
Trackmates screw top tubes with caps	Thermo Scientific	3741	2D barcoded screwcap
96-well microplate with black walls and bottom	Greiner	655076	Flat dark bottom, for dsDNA quantitation
96-well microplate, clear, black walls	Greiner	655090	Flat transparent bottom, for cell culture and imaging
96-well PCR microplate	Biorad	2239441	DNAse/RNAse free
96-well plate, Deepwell	Labcon	949481	For Coxiella mutants infections
PicoGreen	Life Technologies	P7581	For dsDNA quantitation
Triton X-100	Sigma	T9284-500ML	For dsDNA quantitation
Phusion High fidelity DNA Polymerase	New England Biolabs	M0530L	For single primer colony PCR
Celltracker Red CMTPX	Life Technologies	C34552	For imaging
Anti-LAMP1 antibody	Sigma	94403-1ML	For immunofluorescence staining
Hoechst 33258	Sigma	L1418	For imaging
Fluorescence microplate reader Infinite 200 Pro	Tecan
Epifluorescence automated microscope Cellomics	Thermo Scientific