| Type: | Domain | Name: | Chromo domain subgroup |
| Description: | The CHROMO (CHRromatin Organization MOdifier) domain [, , , ] is a conserved region of around 60 amino acids, originally identified in Drosophila modifiers of variegation. These are proteins that alter the structure of chromatin to the condensed morphology of heterochromatin, a cytologically visible condition where gene expression is repressed. In one of these proteins, Polycomb, the chromo domain has been shown to be important for chromatin targeting. Proteins that contain a chromo domain appear to fall into 3 classes. The first class includes proteins having an N-terminal chromo domain followed by a region termed the chromo shadow domain [], eg. Drosophila and human heterochromatin protein Su(var)205 (HP1). The second class includes proteins with a single chromo domain, eg. Drosophila protein Polycomb (Pc); mammalian modifier 3; human Mi-2 autoantigenand and several yeast and Caenorhabditis eleganshypothetical proteins. In the third class paired tandem chromo domains are found, eg. in mammalian DNA-binding/helicase proteins CHD-1 to CHD-4 and yeast protein CHD1.This entry represents a subgroup of the Chromo domain | Short Name: | Chromo_dom_subgr |
