PMID:9662542

Citation	Manjunath, S, Lee, CH, VanWinkle, P and Bailey-Serres, J (1998) Molecular and biochemical characterization of cytosolic phosphoglucomutase in maize. Expression during development and in response to oxygen deprivation. Plant Physiol. 117:997-1006
Abstract	Phosphoglucomutase (PGM) catalyzes the interconversion of glucose (Glc)-1- and Glc-6-phosphate in the synthesis and consumption of sucrose. We isolated two maize (Zea mays L.) cDNAs that encode PGM with 98.5% identity in their deduced amino acid sequence. Southern-blot analysis with genomic DNA from lines with different Pgm1 and Pgm2 genotypes suggested that the cDNAs encode the two known cytosolic PGM isozymes, PGM1 and PGM2. The cytosolic PGMs of maize are distinct from a plastidic PGM of spinach (Spinacia oleracea). The deduced amino acid sequences of the cytosolic PGMs contain the conserved phosphate-transfer catalytic center and the metal-ion-binding site of known prokaryotic and eukaryotic PGMs. PGM mRNA was detectable by RNA-blot analysis in all tissues and organs examined except silk. A reduction in PGM mRNA accumulation was detected in roots deprived of O2 for 24 h, along with reduced synthesis of a PGM identified as a 67-kD phosphoprotein on two-dimensional gels. Therefore, PGM is not one of the so-called "anaerobic polypeptides." Nevertheless, the specific activity of PGM was not significantly affected in roots deprived of O2 for 24 h. We propose that PGM is a stable protein and that existing levels are sufficient to maintain the flux of Glc-1-phosphate into glycolysis under O2 deprivation.
Links	PubMed PMC34954
Keywords	Aerobiosis; Amino Acid Sequence; Anoxia; Cloning, Molecular; Cytosol/enzymology; Gene Expression Regulation, Developmental; Gene Expression Regulation, Enzymologic; Gene Expression Regulation, Plant; Genes, Plant/genetics; Isoenzymes/analysis; Isoenzymes/genetics; Isoenzymes/metabolism; Molecular Sequence Data; Multigene Family/genetics; Phosphoglucomutase/genetics; Phosphoglucomutase/metabolism; Phosphoproteins/analysis; Plant Roots/enzymology; Plant Roots/metabolism; RNA, Messenger/analysis; RNA, Messenger/genetics; RNA, Messenger/metabolism; Sequence Homology, Amino Acid; Transcription, Genetic/genetics; Zea mays/chemistry; Zea mays/enzymology; Zea mays/genetics
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Annotations

Gene product	Qualifier	GO Term	Evidence Code	with/from	Aspect	Extension	Notes	Status
MAIZE:PGMC1		GO:0004614: phosphoglucomutase activity	ECO:0000314:		F		Table 1 shows that the researchers directly measured the conversion of Glc-1-P to Glc-6-P in various Oxidative situations amongst PGMC1 mutants.	complete CACAO 4174
MAIZE:PGMC1	enables	GO:0004614: phosphoglucomutase activity	ECO:0000314: direct assay evidence used in manual assertion		F		Seeded From UniProt	complete

References

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