title: The occurrence of a thylakoid-localized small zinc finger protein in land plants.
abstract: Previous studies showed that LOW QUANTUM YIELD OF PHOTOSYSTEM II 1 (LQY1), a small thylakoid zinc finger protein was involved in maintenance and repair of Photosystem II (PSII). Here the author provide additional evidence for the role of LQY1 in PSII maintenance and repair and further commentary on the occurrence of LQY1 protein among land plants. After exposure to high light, Arabidopsis thaliana mutants lacking functional LQY1 gene (At1g75690) are more photoinhibited than wild-type control plants; display higher total non-photochemical quenching and photoinhibitory quenching. These results are consistent with the initial observation that lqy1 mutants have lower PSII efficiency than wild-type plants after high-light treatment. The low-PSII-efficiency phenotype can be suppressed upon complementation of lqy1 mutants with the LQY1 gene from wild-type plants. This further demonstrates that LQY1 is important in maintaining the activity of photosystem II in Arabidopsis. LQY1 homologs are present in land plants but are absent from sequenced genomes of green algae and cyanobacteria, which may reflect plant adaptation to excess light stress during the transition to land.
authors.affiliation: Department of Biological Sciences, Western Michigan University, Kalamazoo, MI, USA. yan.1.lu@wmich.edu
authors.forename: Yan
authors.initials: Y
authors.lastname: Lu
mesh_terms: D017360:Arabidopsis / Q000235:genetics* / Q000378:metabolism / Q000528:radiation effects; D029681:Arabidopsis Proteins / Q000235:genetics / Q000378:metabolism*; D060365:Chloroplast Proteins / Q000235:genetics / Q000378:metabolism*; D005816:Genetic Complementation Test; D008027:Light; D009154:Mutation; D045332:Photosystem II Protein Complex / Q000378:metabolism; D010802:Phylogeny; D020524:Thylakoids / Q000235:genetics / Q000378:metabolism*; D016335:Zinc Fingers
chemical_list: D029681:Arabidopsis Proteins; D060365:Chloroplast Proteins; D045332:Photosystem II Protein Complex
references.citation: Plant Physiol. 2008 Apr;146(4):1482-500
references.pmid: 18263779
references.citation: Plant J. 1998 Dec;16(6):735-43
references.pmid: 10069079
references.citation: Plant Cell. 2011 May;23(5):1861-75
references.pmid: 21586683
references.citation: Proc Natl Acad Sci U S A. 2010 Jun 15;107(24):11128-33
references.pmid: 20505121
references.citation: Plant Physiol. 2002 Sep;130(1):78-89
references.pmid: 12226488
references.citation: Plant Cell Environ. 2011 Jun;34(6):922-932
references.pmid: 21332514
references.citation: Biochim Biophys Acta. 2007 Jun;1767(6):414-21
references.pmid: 17207454
references.citation: Plant Physiol. 2006 Nov;142(3):878-89
references.pmid: 16980562
references.citation: Plant Physiol. 2001 Apr;125(4):1558-66
references.pmid: 11299337
references.citation: Plant Physiol. 2009 Feb;149(2):1061-75
references.pmid: 19011000
references.citation: Photosynth Res. 2008 Oct-Dec;98(1-3):489-501
references.pmid: 18618287
references.citation: Methods Mol Biol. 2011;775:161-85
references.pmid: 21863443