This domain is found in plants and higher eukaryotes, and is the N-terminal region of micro-spherule proteins which repress the transactivation activities of Nrf1 (p45 nuclear factor-erythroid 2 (p45 NF-E2)-related factor 1) [2]. In conjunction with DIPA the full-length protein acts as a transcription repressor [1]. The exact function of the region is not known.

1: MCRS2 represses the transactivation activities of Nrf1. Wu JL, Lin YS, Yang CC, Lin YJ, Wu SF, Lin YT, Huang CF; BMC Cell Biol. 2009;10:9. PMID:19187526

2: DIPA, which can localize to the centrosome, associates with p78/MCRS1/MSP58 and acts as a repressor of gene transcription. Du X, Wang Q, Hirohashi Y, Greene MI; Exp Mol Pathol. 2006;81:184-190. PMID:17014843