Vipp1 is required for basic thylakoid membrane formation but not for the assembly of thylakoid protein complexes

A Functional Component of the Transcriptionally Active Chromosome Complex, Arabidopsis pTAC14, Interacts with pTAC12/HEMERA and Regulates Plastid Gene Expression

“…Similarly, differently sized vesicles can be observed in the chloroplasts of these mutants. The thylakoid membrane system of Dvipp1 mutants is also severely disturbed, and the chloroplasts in vipp1 cannot form vesicles (Kroll et al, 2001;Aseeva et al, 2007). These results suggest that chloroplast development in these mutants is arrested at the thylakoid formation stage, as in the ptac14 mutant.…”

“…They named 18 components, which were not studied in depth at that time, as pTACs (for plastid TAC proteins). Among the recent advances made in the study of TACs, several components responsible for the albino or pale-green phenotype have been described, such as heteromeric FSD2 and FSD3 , Whirly proteins (Maréchal et al, 2009), pTAC4/Vipp1 (Kroll et al, 2001;Aseeva et al, 2007), pTAC2/6/12 (Pfalz et al, 2006), AtMurE (Garcia et al, 2008), TRXz (Arsova et al, 2010), and FLN1 and FLN2 (Arsova et al, 2010). Recently, Chen et al (2010) found that HEMERA, previously called pTAC12, had a function in the nucleus, where it acted specifically in phytochrome signaling.…”

Repression of Essential Chloroplast Genes Reveals New Signaling Pathways and Regulatory Feedback Loops inChlamydomonas

“…By contrast, the level of Vipp1 (Kroll et al, 2001;Aseeva et al, 2007) and Alb3.2 (Göhre et al, 2006), two proteins that play an important role in thylakoid membrane biogenesis, and the level of the chaperones Hsp70B and Hsp90C and of the cochaperone CDJ1 (DnaJ) increased significantly after 48 h ( Figure 4D). The first two proteins are known to interact with each other and Hsp70B is involved in the refolding of stress-denatured proteins, especially under heat shock or high light where it plays a role in protection and photorepair of PSII.…”

Thylakoid Development from Biogenesis to Senescence, and Ruminations on Regulation

“…VIPP1 is highly conserved among photosynthetic organisms and is required for thylakoid membrane formation but not for the assembly of the thylakoid membrane protein complexes (Aseeva et al, 2007). It is instructive to note that although VIPP1 is required for basic formation of the thylakoid lipid bilayer membrane, Aseeva et al (2007) make no reference to it as regulating or controlling thylakoid formation.…”

“…VIPP1 is highly conserved among photosynthetic organisms and is required for thylakoid membrane formation but not for the assembly of the thylakoid membrane protein complexes (Aseeva et al, 2007). It is instructive to note that although VIPP1 is required for basic formation of the thylakoid lipid bilayer membrane, Aseeva et al (2007) make no reference to it as regulating or controlling thylakoid formation. This could be in accord with a general idea that regulation implies either control of flux through a metabolic pathway (such as enzyme activities) or genetic control of developmental processes (such as transcription factors affecting major developmental pathways) (see Pichersky, 2005).…”