Sam Katzif, PhD

Associate Professor

Midwestern University
Arizona College of Osteopathic Medicine
Department of Microbiology and Immunology 
Agave Hall 203-J
19555 N. 59th Ave.
Glendale, Arizona 85308
Office: 623-572-3392

Email me


BA Psychology Georgia Southern College 1971
MS Biology Baylor University 1983
PhD Microbiology Georgia State University 1999


Although the genome of a variety of Staphylococcus aureus strains have been sequenced and genes identified, the regulation and the interactions of many of these genes and gene products remain unresolved. One of these genes is a cold shock protein, cspA (SA1234), recently renamed msaB, modulator of sarA and a component of the proposed operon, msaABCR (Sahukhal and Elasri 2014).  My work with this gene cspA has revealed apparent links to either direct or indirect regulation of the phenotypic characteristics of pigmentation, susceptibility to the antimicrobial peptide CG117-136, and biofilm production.  

We are currently carrying out experiments that will:·        

Selected publications

CspA regulates pigment production in Staphylococcus aureus through a SigB-dependent mechanism. Katzif S, Lee EH, Law AB, Tzeng YL, Shafer WM.
J Bacteriol. 2005 Dec;187(23):8181-4.

The major cold shock gene, cspA, is involved in the susceptibility of Staphylococcus aureus to an antimicrobial peptide of human cathepsin G. Katzif S, Danavall D, Bowers S, Balthazar JT, Shafer WM. Infect Immun. 2003 Aug;71(8):4304-12.  

Tailoring an antibacterial peptide of human lysosomal cathepsin G to enhance its broad-spectrum action against antibiotic-resistant bacterial pathogens. Shafer WM, Katzif S, Bowers S, Fallon M, Hubalek M, Reed MS, Veprek P, Pohl J. Curr Pharm Des. 2002;8(9):695-702. Review. 

Participation of the purine repressor in control of the carbamoylphosphate synthetase operon in Salmonella typhimurium. Lu CD, Katzif S, Abdelal AT. Mol Microbiol. 1995 Sep;17(5):   981-8.

Nitrogen and the threshold odor number produced by an actinomycete isolated from lake sediments. Lind OT, Katzif, SD. Water Science Technology. 1988. 20(8/9):185-191.