Protein Family Models

The Mar proteins are involved in the multiple antibiotic resistance, a non-specific resistance system. The expression of the mar operon is controlled by a repressor, MarR. A large number of compounds induce transcription of the mar operon. This is thought to be due to the compound binding to MarR, and the resulting complex stops MarR binding to the DNA. With the MarR repression lost, transcription of the operon proceeds [1]. The structure of MarR is known [2] and shows MarR as a dimer with each subunit containing a winged-helix DNA binding motif. [1]. 9068629. The Salmonella typhimurium mar locus: molecular and genetic. analyses and assessment of its role in virulence.. Sulavik MC, Dazer M, Miller PF;. J Bacteriol 1997;179:1857-1866.. [2]. 11473263. The crystal structure of MarR, a regulator of multiple. antibiotic resistance, at 2.3 A resolution.. Alekshun MN, Levy SB, Mealy TR, Seaton BA, Head JF;. Nat Struct Biol 2001;8:710-714. (from Pfam)

Date:

2024-04-03

Date:

2023-12-12

Date:

2023-12-12

The Mar proteins are involved in the multiple antibiotic resistance, a non-specific resistance system. The expression of the mar operon is controlled by a repressor, MarR. A large number of compounds induce transcription of the mar operon. This is thought to be due to the compound binding to MarR, and the resulting complex stops MarR binding to the DNA. With the MarR repression lost, transcription of the operon proceeds [1]. The structure of MarR is known [2] and shows MarR as a dimer with each subunit containing a winged-helix DNA binding motif. [1]. 9068629. The Salmonella typhimurium mar locus: molecular and genetic. analyses and assessment of its role in virulence.. Sulavik MC, Dazer M, Miller PF;. J Bacteriol 1997;179:1857-1866.. [2]. 11473263. The crystal structure of MarR, a regulator of multiple. antibiotic resistance, at 2.3 A resolution.. Alekshun MN, Levy SB, Mealy TR, Seaton BA, Head JF;. Nat Struct Biol 2001;8:710-714. (from Pfam)

Date:

2024-04-03

A number of human microbiome species from both the Firmicutes and the spirochete genus Treponema share a gene cassette encoding a pair of radical SAM enzymes and, in most cases, this MarR family transcriptional regulator as well. Sequence identity can exceed 96 percent, suggesting recent lateral transfer. These observations suggest the cassette confers resistance to a toxic compound such as an antibiotic.

Date:

2019-09-10

reg_rSAM_mob family protein

Date:

2017-03-02