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Summary: encodes a chloroplast-localized homolog of SecY, the core component of the Sec membrane translocon in prokaryotic organisms. Null csy1 alleles are pale yellow and seedling lethal due to the absence of most thylakoid membrane proteins.
Images: mutant leaf color mutants, on a seedling color scale
First report: Roy and Barkan 1998.
Key Alleles
3 independent alleles identified in a TUSC screen at Pioneer Hi-Bred (Johnston, IA), with same phenotype:
csy1-1::MuDR, MuDR inserted in first exon.
csy1-2::Mu1, Mu1 inserted in first exon.
csy1-3::Mu8, Mu8 inserted in second exon.
Map Location
Maps to chromome 5S, between bnlg1879 and bnl7.56. (see map BNL 2002 5 in MaizeGDB). This location is in conflict with version 1 of the B73 reference genome sequence.
Gene Product
CpSecY: thylakoid Sec-pathway translocase. In prokaryotes, SecY is the core component of the Sec membrane translocon.
References
Roy LM, Barkan A. (1998) A SecY Homologue Is Required for the Elaboration of the Chloroplast Thylakoid Membrane and for Normal Chloroplast Gene Expression. J Cell Biol 141: 385-395. PUBMED