1. Department of Microbiology, Stellenbosch University, Matieland 7602, South Africa
2. Institute for Microbial Biotechnology and Metagenomics, University of the Western Cape, Level 2 New Life Sciences Building, Robert Sobukwe Rd, Bellville 7535, South Africa
3. Experimental Research Group, Faculty of Medicine and Health Sciences, Department of Medicine, Stellenbosch University, Francie van Zijl Drive, Parow 7499, South Africa
4. Department of Chemistry and Howard Hughes Medical Institute, University of Illinois at Urbana−Champaign, Urbana, Illinois 61801, United States