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Gene Review:

PORA - protochlorophyllide reductase A

Arabidopsis thaliana

Synonyms: K18G13.7, K18G13_7, protochlorophyllide oxidoreductase A

Kim, C. et al., Kim, C. et al., Franck, F. et al., Runge, S. et al., Sperling, U. et al., et al.

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High impact information on PORA

The import of one of them, PORA, into plastids of cotyledons is substrate dependent [1].
The organ specificity of the substrate-dependent import of PORA reveals a means of controlling plastid protein translocation that is closely associated with a key step in plant development, the light-dependent transformation of cotyledons from a storage organ to a photosynthetically active leaf [1].
Etioplast differentiation in arabidopsis: both PORA and PORB restore the prolamellar body and photoactive protochlorophyllide-F655 to the cop1 photomorphogenic mutant [2].
Here we have examined in detail whether these polypeptides play redundant roles in etioplast differentiation by manipulating the total POR content and the PORA-to-PORB ratio of etiolated Arabidopsis seedlings using antisense and overexpression approaches [3].
In order to study the in vivo functions of Arabidopsis POR A and POR B we have abolished the expression of PorA through the use of the phytochrome A-mediated far-red high irradiance response [4].

Biological context of PORA

Their involvement in conferring substrate dependency and organ specificity of PORA import was analyzed in intact Arabidopsis seedlings of wild type and the three mutants ppi3, ppi1 and ppi2 that are deficient in atToc34, atToc33, a closely related isoform of atToc34, and atToc159 [5].

Anatomical context of PORA

In contrast to PORB the import of PORA into plastids of cotyledons is substrate-dependent and organ-specific [5].

Other interactions of PORA

Moreover, light-regulated expression of the CHS, PORA and PsbS genes was attenuated in fin5-1 mutant plants, while the light-induced expression of CAB was normal [6].

References

Substrate-dependent and organ-specific chloroplast protein import in planta. Kim, C., Apel, K. Plant Cell (2004) [Pubmed]
Etioplast differentiation in arabidopsis: both PORA and PORB restore the prolamellar body and photoactive protochlorophyllide-F655 to the cop1 photomorphogenic mutant. Sperling, U., Franck, F., van Cleve, B., Frick, G., Apel, K., Armstrong, G.A. Plant Cell (1998) [Pubmed]
Regulation of etioplast pigment-protein complexes, inner membrane architecture, and protochlorophyllide a chemical heterogeneity by light-dependent NADPH:protochlorophyllide oxidoreductases A and B. Franck, F., Sperling, U., Frick, G., Pochert, B., van Cleve, B., Apel, K., Armstrong, G.A. Plant Physiol. (2000) [Pubmed]
Distinct roles for light-dependent NADPH:protochlorophyllide oxidoreductases (POR) A and B during greening in higher plants. Runge, S., Sperling, U., Frick, G., Apel, K., Armstrong, G.A. Plant J. (1996) [Pubmed]
Multiplicity of different cell- and organ-specific import routes for the NADPH-protochlorophyllide oxidoreductases A and B in plastids of Arabidopsis seedlings. Kim, C., Ham, H., Apel, K. Plant J. (2005) [Pubmed]
FIN5 positively regulates far-red light responses in Arabidopsis thaliana. Cho, D.S., Hong, S.H., Nam, H.G., Soh, M.S. Plant Cell Physiol. (2003) [Pubmed]

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