Score: 3.00 |
Title: Rice APOPTOSIS INHIBITOR5 coupled with two DEAD-box adenosine 5-triphosphate-dependent RNA helicases regulates tapetum degeneration .
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Author: Li X Gao X Wei Y Deng L Ouyang Y Chen G Li X Zhang Q Wu C |
Journal: Plant Cell Citation: V : 23 P : 1416-34 Year: 2011 Type: MEDLINE |
Literature: oryza Field: abstract Doc ID: pub21467577 Accession (PMID): 21467577 |
Abstract: Programmed cell death ( PCD ) during tapetum degeneration in postmeiotic anthers is critical for the proper development of male gametophytes in flowering plants .
Although several genes involved in this process have been identified recently , the molecular mechanism is still poorly understood .
Here , we show that knockout of rice ( Oryza sativa ) APOPTOSIS INHIBITOR5 ( API5 ) , which encodes a putative homolog of antiapoptosis protein Api5 in animals , results in delayed degeneration of the tapetum due to inhibition of the tapetal PCD process leading to defects in formation of male gametophytes .
Os API5 is a nuclear protein that interacts with two DEAD-box ATP-dependent RNA helicases , API5-INTERACTING PROTEIN1 ( AIP1 ) and AIP2 .
AIP1 and AIP2 are homologs of yeast ( Saccharomyces cerevisiae ) Suppressor of Bad Response to Refrigeration1 protein 2 ( SUB2p ) that have critical roles in transcription elongation and pre-mRNA splicing .
Os AIP1 and AIP2 can form dimers and interact directly with the promoter region of CP1 , a rice cysteine protease gene .
Suppression of Os AIP1/2 leads to down-regulation of CP1 , resulting in sterility , which is highly similar to the effects of suppressed expression of Os CP1 .
Our results uncover a previously unknown pathway for regulating PCD during tapetum degeneration in rice , one that may be conserved among eukaryotic organisms .
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Matching Sentences: [ Sen. 4, subscore: 1.00 ]: Os API5 is a nuclear protein that interacts with two DEAD-box ATP-dependent RNA helicases , API5-INTERACTING PROTEIN1 ( AIP1 ) and AIP2 . [ Sen. 5, subscore: 1.00 ]: AIP1 and AIP2 are homologs of yeast ( Saccharomyces cerevisiae ) Suppressor of Bad Response to Refrigeration1 protein 2 ( SUB2p ) that have critical roles in transcription elongation and pre-mRNA splicing . [ Sen. 6, subscore: 1.00 ]: Os AIP1 and AIP2 can form dimers and interact directly with the promoter region of CP1 , a rice cysteine protease gene .
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