ECF265 ECF proteins

General description: Proteins from ECF265 have homology to proteins from original ECF30 (46.6%), ECF55 (5.84%) and ECF112 (0.51%), and are present in Firmicutes (95.80%) and Actinobacteria (3.50%).

Regulation: Members of ECF265 are associated with AS factors with one transmembrane helix (51.87%) in +1. In the case of ECF265s4 and ECF265s7, which appear primarily in the Bacillus genus, there is no apparent AS factor in their genetic context. In these groups, ECFs share the genetic neighborhood with a transcriptional repressor from PadR family (+1) and a cell cycle protein (+2) involved in peptidoglycan synthesis such as FtsW, RodA or SpoVE (Pfam: PadR and FTSW_RODA_SPOVE) in +1 and +2, respectively. PadR is involved in negative regulation of the phenolic acid metabolism and RodA is a peptidoglycan glycosyltransferase involved in peptidoglycan biosynthesis. It is possible that in these two subgroups the AS factor is substituted by transcriptional control.

Genomic context conservation: Apart from the proteins mentioned above, the only conserved element in the genomic neighborhood of members of ECF265 are the inner-membrane component of an ABC transporter (Pfam: BPD_transp_1) (ECF265s24).

Promoter motif conservation: Promoter motifs are subgroup-dependent conserved and usually contain AAC in -35 and CGTC in -10; in agreement with the prediction for original ECF30 (Staroń et al., 2009).

Summary: In summary, ECF265 seems to be regulated by putative AS factors encoded in +1 with diverse unknown domains, in contrast to original ECF30 (Staroń & Mascher, 2010). Two subgroups, ECF265s4 and ECF265s7, seem to be regulated by a PadR transcriptional repressor encoded in +1 and involved in phenolic acid metabolism. Since RodA is encoded in position +2 in ECF265s4 and ECF265s7, proteins from these subgroups might be involved in peptidoglycan biosynthesis.


Basic information

Number of representative ECFs: 1328

Number of non-redundant ECFs: 1781

Sequences with C-terminal extension: 0.11%

Sequences with N-terminal extension: 1.80%

Overrepresented phylum: Firmicutes [97.36%]

Sample Neighborhood

Protein EOS21727.1 of Assembly GCA_000403215.2 (Lachnospiraceae bacterium A4)

Promoter Motif


Protein sequence length distribution

Gene neighbourhood conservation analysis

Overall Pfam domain distribution: Cumulative frequency of Pfam domains across the genetic neighborhoods. Frequency is expressed as number of Pfam domains per ECF sigma factor. Only domains present in more than 75% of the neighborhoods are shown. Genetic neighborhoods contain the proteins encoded in ±10 from the ECF coding sequence. Only the non-overlapping, highest scoring domains are considered positive. If a protein contains several copies of a domain, only one instance is further considered. In order to avoid sequence bias, only proteins from assemblies defined as "representative" or "reference" by NCBI are included (see
Pfam domain distribution per position: Frequency of Pfam domain architectures in the proteins encoded in ±10 (x-axis) from the ECF coding sequences. Frequency is expressed as number of times a certain domain architecture appears per ECF sigma factor. Only the highest scoring domains with no position overlap are considered in the domain architectures. Note that the order of the Pfam domains in domain architectures may differ from their name. When a protein contains several copies of a domain, only one instance is further considered. Only domain architectures present in more than 20% of the proteins encoded in any position are shown. In order to avoid sequence bias, only proteins from assemblies defined as "representative" or "reference" by NCBI are included (see

Related publications

Title Journal Year Authors PubMed ECF groups
The third pillar of bacterial signal transduction: classification of the extracytoplasmic function (ECF) sigma factor protein family. Molecular microbiology 2009 A. Staroń, H. Sofia, S. Dietrich, L. Ulrich, H. Liesegang, T. Mascher PubMed: 19737356 ECF114, ECF31, ECF22, ECF12, ECF27, ECF122, ECF121, ECF56, ECF03, ECF21, ECF23, ECF02, ECF41, ECF15, ECF107, ECF111, ECF39, ECF19, ECF25, ECF17, ECF26, ECF118, ECF11, ECF16, ECF42, ECF38, ECF103, ECF36, ECF28, ECF51, ECF115, ECF40, ECF14, ECF29, ECF123, ECF33, ECF102, ECF105, ECF106, ECF116, ECF130, ECF18, ECF235, ECF120, ECF239, ECF240, ECF242, ECF243, ECF249, ECF265, ECF271, ECF281, ECF285, ECF286, ECF289, ECF290, ECF291, ECF292, ECF293, ECF294, ECF30, ECF32, ECF43
General stress response in α-proteobacteria: PhyR and beyond. Molecular microbiology 2010 A. Staroń, T. Mascher PubMed: 20979331 ECF265
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