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  • 1
    Electronic Resource
    Electronic Resource
    Purification and PCR-based cDNA cloning of a plastidial n-6 desaturase (1994)
    Springer
    Plant molecular biology 26 (1994), S. 631-642 
    Details
    ISSN: 1573-5028
    Keywords: desaturase ; chloroplast envelope ; membrane protein purification ; reverse transcriptase/PCR ; transit peptide
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A plastidial membrane-bound n-6 desaturase from spinach (Spinacia oleracea) was purified from chloroplast envelope membranes by anion exchange, cation exchange and ferredoxin-affinity chromatography. The molecular mass of the protein was estimated by SDS-PAGE to be 40 kDa. The highest specific activity of the desaturase in the final preparation was 196 nmol/min per mg protein with free oleic acid as the substrate. The N-terminal amino acid sequence of the blotted protein was determined and used for the construction of a degenerated and inosine-containing oligonucleotide primer for PCR experiments with cDNA transcribed from leaf mRNA. A 3′-RACE experiment with this primer amplified a single band of 1500 bp that after sequencing showed an open reading frame of 382 amino acids corresponding to a protein of 43 kDa. The 5′ end of the cDNA was amplified by a 5′-RACE experiment and isolated as a 500 bp fragment. Sequencing of this DNA revealed an additional 65 amino acids at the N-terminus of the native protein that are attributed to a plastidial leader peptide. With appropriate primers derived from these sequences a full-length clone was amplified by PCR and sequenced. Comparison of the plastidial oleate desaturase with the homologous enzyme from cyanobacteria showed about 50% amino acid homology. Comparison with other desaturases revealed three histidine boxes with the general sequence HXXXH that are highly conserved in all membrane-bound desaturases. These boxes might be involved in metal ion complexation required for reduction of oxygen.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00013749
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  • 2
    Electronic Resource
    Electronic Resource
    Purification and cDNA sequencing of an oleate-selective acyl-ACP:sn-glycerol-3-phosphate acyltransferase from pea chloroplasts (1991)
    Springer
    Plant molecular biology 17 (1991), S. 1067-1076 
    Details
    ISSN: 1573-5028
    Keywords: chilling sensitivity ; glycerolipid biosynthesis ; immunoscreening ; Pisum sativum ; tryptic sequences ; transit peptide
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The soluble acyl-ACP:sn-glycerol-3-phosphate acyltransferase from chloroplasts of chilling-sensitive and -resistant plants differ in their fatty acid selectivity. Enzymes from resistant plants discriminate against non-fluid palmitic acid and select oleic acid whereas the acyltransferase from sensitive plants accepts both fatty acids. To use this difference for improving plant chilling resistance by biotechnology the gene for an oleate-selective enzyme is required. Therefore, the oleate-selective enzyme from pea seedlings was purified to apparent homogeneity. Tryptic peptides of internal origin were sequenced. Polyclonal antibodies raised in rabbits were used for an immunological screening of a pea leaf cDNA expression library in λgt11. A positive clone of 1800 bp was selected showing an open reading frame which codes for 457 amino acids. The deduced amino acid sequence coincides perfectly with the tryptic sequences. A tentative assignment of the processing site was made which divides the preprotein into a mature protein of 41 kDa in accordance with experimental findings and a transit peptide of 88 amino acids. At present the comparison between a selective (pea) and an unselective (squash) acyltransferase sequence does not provide a clue for recognizing the structural differences resulting in different selectivities.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00037145
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  • 3
    Electronic Resource
    Electronic Resource
    Membranlipid-Biosynthese in Chloroplasten (1983)
    Weinheim : Wiley-Blackwell
    Biologie in unserer Zeit 13 (1983), S. 178-187 
    Details
    ISSN: 0045-205X
    Keywords: Life and Medical Sciences
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/biuz.19830130607
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