Cell division topological specificity factor MinE (IPR005527)

Short name: MinE

Family relationships



Cytokinesis needs to be regulated spatially in order to ensure that it occurs between the daughter genomes. In prokaryotes such as Escherichia coli, cytokinesis is initiated by FtsZ, a tubulin-like protein that assembles into a ring structure at the cell centre called the Z ring. A fundamental problem in prokaryotic cell biology is to understand how the midcell division site is identified. Two major negative regulatory systems are known to be involved in preventing Z-ring assembly at all sites except the midcell. One of these systems, called nucleoid occlusion, blocks Z-ring assembly in the area occupied by an unsegregated nucleoid until a critical stage in chromosome replication or segregation is reached. The other system consists of three proteins, MinC, MinD and MinE, which prevent assembly of Z rings in regions of the cell not covered by the nucleoid, such as the cell poles. MinC is an inhibitor of FtsZ polymerisation, resulting in the inhibition of Z ring assembly in the cell; MinD greatly enhances the inhibitory effects of MinC in vivo; and MinE antagonizes the effects of MinC and MinD [PMID: 11378404].

MinE is a small bifunctional protein. The amino terminus of MinE is required to interact with MinD, while the carboxyl terminus is required for `topological specificity' - that is, the ability of MinE to antagonise MinCD inhibition of Z rings at the midcell position but not at the poles [PMID: 2645057].

This entry also include plant MinE1 located in chloroplasts. AtMinE1 acts as a topological specificity factor during plastid division and specify plastid constriction sites [PMID: 11743109].

GO terms

Biological Process

GO:0051301 cell division
GO:0032955 regulation of barrier septum assembly

Molecular Function

No terms assigned in this category.

Cellular Component

No terms assigned in this category.

Contributing signatures

Signatures from InterPro member databases are used to construct an entry.