GUN4 cDNA ORF clone, Arabidopsis thaliana(thale cress)

Sequence and analysis of chromosome 3 of the plant Arabidopsis thaliana.
Salanoubat M, Lemcke K, Rieger M, Ansorge W, Unseld M, Fartmann B, Valle G, Bl?cker H, Perez-Alonso M, Obermaier B, Delseny M, Boutry M, Grivell LA, Mache R, Puigdom?nech P, De Simone V, Choisne N, Artiguenave F, Robert C, Brottier P, Wincker P, Cattolico L, Weissenbach J, Saurin W, Qu?tier F, Sch?fer M, M?ller-Auer S, Gabel C, Fuchs M, Benes V, Wurmbach E, Drzonek H, Erfle H, Jordan N, Bangert S, Wiedelmann R, Kranz H, Voss H, Holland R, Brandt P, Nyakatura G, Vezzi A, D'Angelo M, Pallavicini A, Toppo S, Simionati B, Conrad A, Hornischer K, Kauer G, L?hnert TH, Nordsiek G, Reichelt J, Scharfe M, Sch?n O, Bargues M, Terol J, Climent J, Navarro P, Collado C, Perez-Perez A, Ottenw?lder B, Duchemin D, Cooke R, Laudie M, Berger-Llauro C, Purnelle B, Masuy D, de Haan M, Maarse AC, Alcaraz JP, Cottet A, Casacuberta E, Monfort A, Argiriou A, flores M, Liguori R, Vitale D, Mannhaupt G, Haase D, Schoof H, Rudd S, Zaccaria P, Mewes HW, Mayer KF, Kaul S, Town CD, Koo HL, Tallon LJ, Jenkins J, Rooney T, Rizzo M, Walts A, Utterback T, Fujii CY, Shea TP, Creasy TH, Haas B, Maiti R, Wu D, Peterson J, Van Aken S, Pai G, Militscher J, Sellers P, Gill JE, Feldblyum TV, Preuss D, Lin X, Nierman WC, Salzberg SL, White O, Venter JC, Fraser CM, Kaneko T, Nakamura Y, Sato S, Kato T, Asamizu E, Sasamoto S, Kimura T, Idesawa K, Kawashima K, Kishida Y, Kiyokawa C, Kohara M, Matsumoto M, Matsuno A, Muraki A, Nakayama S, Nakazaki N, Shinpo S, Takeuchi C, Wada T, Watanabe A, Yamada M, Yasuda M, Tabata S, , ,
Nature408(6814)820-2(2000 Dec)

In conjunction with the dark repression of 5-aminolevulinic acid synthesis, GUN4 phosphorylation minimizes the flow of intermediates into the Mg branch of the tetrapyrrole metabolic pathway for chlorophyll biosynthesis.
Title: Phosphorylation of GENOMES UNCOUPLED 4 Alters Stimulation of Mg Chelatase Activity in Angiosperms.

GUN1 and GUN4 partially restored the expression patterns of the previously detected chloroplast-associated genes, thereby ameliorating the slow-greening phenotype of sg1.
Title: The tetratricopeptide repeat-containing protein slow green1 is required for chloroplast development in Arabidopsis.

ChlH and GUN4 use distinct mechanisms to associate with chloroplast membranes.
Title: GUN4-porphyrin complexes bind the ChlH/GUN5 subunit of Mg-Chelatase and promote chlorophyll biosynthesis in Arabidopsis.

Data show that mutant subunits act as inhibitors of ChlH, and this inhibition is reversed upon addition of Gun4.
Title: Abolition of magnesium chelatase activity by the gun5 mutation and reversal by Gun4.

GUN4 stimulates chlorophyll biosynthesis not only by activating Mg-chelatase but also by promoting interactions between ChlH and chloroplast membranes
Title: Porphyrins promote the association of GENOMES UNCOUPLED 4 and a Mg-chelatase subunit with chloroplast membranes.