TY - JOUR
T1 - Biotin-mediated growth and gene expression in Staphylococcus aureus is highly responsive to environmental biotin
AU - Satiaputra, Jiulia
AU - Eijkelkamp, Bart A.
AU - McDevitt, Christopher A.
AU - Shearwin, Keith E.
AU - Booker, Grant W.
AU - Polyak, Steven W.
PY - 2018/3/5
Y1 - 2018/3/5
N2 - Biotin (Vitamin B7) is a critical enzyme co-factor in metabolic pathways important for bacterial survival. Biotin is obtained either from the environment or by de novo synthesis, with some bacteria capable of both. In certain species, the bifunctional protein BirA plays a key role in biotin homeostasis as it regulates expression of biotin biosynthetic enzymes in response to biotin demand and supply. Here, we compare the effect of biotin on the growth of two bacteria that possess a bifunctional BirA, namely Escherichia coli and Staphylococcus aureus. Unlike E. coli that could fulfill its biotin requirements through de novo synthesis, S. aureus showed improved growth rates in media supplemented with 10 nM biotin. S. aureus also accumulated more radiolabeled biotin from the media highlighting its ability to efficiently scavenge exogenous material. These data are consistent with S. aureus colonizing low biotin microhabitats. We also demonstrate that the S. aureus BirA protein is a transcriptional repressor of BioY, a subunit of the biotin transporter, and an operon containing yhfT and yhfS, the products of which have a putative role in fatty acid homeostasis. Increased expression of bioY is proposed to help cue S. aureus for efficient scavenging in low biotin environments.
AB - Biotin (Vitamin B7) is a critical enzyme co-factor in metabolic pathways important for bacterial survival. Biotin is obtained either from the environment or by de novo synthesis, with some bacteria capable of both. In certain species, the bifunctional protein BirA plays a key role in biotin homeostasis as it regulates expression of biotin biosynthetic enzymes in response to biotin demand and supply. Here, we compare the effect of biotin on the growth of two bacteria that possess a bifunctional BirA, namely Escherichia coli and Staphylococcus aureus. Unlike E. coli that could fulfill its biotin requirements through de novo synthesis, S. aureus showed improved growth rates in media supplemented with 10 nM biotin. S. aureus also accumulated more radiolabeled biotin from the media highlighting its ability to efficiently scavenge exogenous material. These data are consistent with S. aureus colonizing low biotin microhabitats. We also demonstrate that the S. aureus BirA protein is a transcriptional repressor of BioY, a subunit of the biotin transporter, and an operon containing yhfT and yhfS, the products of which have a putative role in fatty acid homeostasis. Increased expression of bioY is proposed to help cue S. aureus for efficient scavenging in low biotin environments.
KW - Biotin
KW - Biotin protein ligase
KW - BirA
KW - Gene expression/regulation
KW - Staphylococcus aureus
UR - http://www.scopus.com/inward/record.url?scp=85044442709&partnerID=8YFLogxK
UR - http://purl.org/au-research/grants/nhmrc/1068885
UR - http://purl.org/au-research/grants/nhmrc/1080784
UR - http://purl.org/au-research/grants/nhmrc/1122582
UR - http://purl.org/au-research/grants/arc/DP160101450
UR - http://purl.org/au-research/grants/arc/DP150101856
UR - http://purl.org/au-research/grants/arc/DP170102102
U2 - 10.1007/s00253-018-8866-z
DO - 10.1007/s00253-018-8866-z
M3 - Article
C2 - 29508030
AN - SCOPUS:85044442709
SN - 0175-7598
VL - 102
SP - 3793
EP - 3803
JO - Applied Microbiology and Biotechnology
JF - Applied Microbiology and Biotechnology
IS - 8
ER -