MpeZ family


MpeZ is specific of marine Synechococcus belonging to pigment type 3dA, one of two kinds of type IV chromatic acclimaters. The mpeZ gene is located in the CA4-A genomic island, which also comprises the transcriptional regulators fciA-B-C and the yet uncharacterized gene unk10 (Humily et al. 2013; Sanfilippo et al. 2016, 2019). The CA4-A island is generally localized outside the main phycobilisome rod region, with rare exceptions (Grébert et al. 2022). MpeW has been biochemically characterized as a PEB:Cys-83 alpha-PEII lyase-isomerase in Synechococcus strain RS9916 (Shukla et al. 2012). In this and other pigment type 3dA strains, this site binds a PUB in blue light and a PEB in green light, as the result of a competition between the constitutively expressed PEB lyase gene mpeY and the PEB lyase-isomerase gene mpeZ, which is strongly activated in blue light but repressed in green light (Humily et al. 2013; Sanfilippo et al. 2019).


Gene Locus tag Genbank Species Strain PBP in rods Pigment type Remark Length Last change
MpeZ family sync_2228 YP_731426.1 Synechococcus sp. CC9311 PC+PEI+PEII 3dA/CA4-A 409 09-26-2011
MpeZ family Syncc9902_1568 YP_377570.1 Synechococcus sp. CC9902 PC+PEI+PEII 3dA/CA4-A 409 09-26-2011
MpeZ family BL107_10891 ZP_01469555.1 Synechococcus sp. BL107 PC+PEI+PEII 3dA/CA4-A 409 09-26-2011
MpeZ family RS9916_39531 ZP_01472949.1 Synechococcus sp. RS9916 PC+PEI+PEII 3dA/CA4-A 413 09-26-2011
MpeZ family SynRCC307_2004 YP_001228260.1 Synechococcus sp. RCC307 PC+PEI+PEII 3eA 414 09-26-2011

Model strain Model strains, Marine strains

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