Die wasserlöslichen Vitamine in den Siebröhrensäften einiger Bäume

Ziegler, H.; Ziegler, Irmgard

doi:10.1016/s0367-1615(17)32592-2

Cited by 11 publications

(6 citation statements)

References 22 publications

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“…Data on extracellular (cell-wall) biotin concentrations are not available. However, free biotin concentrations in the phloem of several plants have been determined (Ziegler and Ziegler, 1962) and were shown to be in the nanomolar range. Similar concentrations were reported for other plant tissues (Blattna Â , 1964).…”

Section: Biotin Transport Appears To Be a General Property Of Plant Smentioning

confidence: 99%

Plant sucrose-H+ symporters mediate the transport of vitamin H

Ludwig

Stolz

Sauer

2000

Plant J

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A cDNA coding for a vitamin H (biotin) transport protein from Arabidopsis was identified by genetic complementation of a biotin uptake-deficient yeast mutant. Vitamin H transport by this protein was sensitive to the SH-group inhibitor p-chloromercuribenzene sulfonic acid (PCMBS) and to the uncoupler carbonyl cyanide-m-chlorophenylhydrazone (CCCP), suggesting an energy-dependent biotin-H+ symport mechanism. The transport activity could contribute to the so-far uncharacterized plant sucrose-H+ symporter AtSUC5 which mediates the energy-dependent transport of biotin and sucrose, and restores growth of the biotin transport-deficient yeast mutant on medium with low biotin concentrations. Functional comparison of the AtSUC5 transporter with previously characterized plant sucrose or monosaccharide transporters revealed that biotin transport may be a general and specific property of all plant sucrose transporters (sucrose/biotin-H+ symporters). This first report on a transporter with dual substrate specificity for two structurally unrelated molecules has a major impact on general thinking concerning the specificity of membrane transporters. The physiological relevance of this finding is discussed.

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Section: Biotin Transport Appears To Be a General Property Of Plant Smentioning

confidence: 99%

Plant sucrose-H+ symporters mediate the transport of vitamin H

Ludwig

Stolz

Sauer

2000

Plant J

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show abstract

“…Data on extracellular (cell‐wall) biotin concentrations are not available. However, free biotin concentrations in the phloem of several plants have been determined (Ziegler and Ziegler, 1962) and were shown to be in the nanomolar range. Similar concentrations were reported for other plant tissues (Blattná, 1964).…”

Section: Resultsmentioning

confidence: 99%

Plant sucrose‐H⁺ symporters mediate the transport of vitamin H

Ludwig

Stolz

Sauer³

2000

The Plant Journal

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Summary A cDNA coding for a vitamin H (biotin) transport protein from Arabidopsis was identified by genetic complementation of a biotin uptake‐deficient yeast mutant. Vitamin H transport by this protein was sensitive to the SH‐group inhibitor p‐chloromercuribenzene sulfonic acid (PCMBS) and to the uncoupler carbonyl cyanide‐m‐chlorophenylhydrazone (CCCP), suggesting an energy‐dependent biotin‐H+ symport mechanism. The transport activity could contribute to the so‐far uncharacterized plant sucrose‐H+ symporter AtSUC5 which mediates the energy‐dependent transport of biotin and sucrose, and restores growth of the biotin transport‐deficient yeast mutant on medium with low biotin concentrations. Functional comparison of the AtSUC5 transporter with previously characterized plant sucrose or monosaccharide transporters revealed that biotin transport may be a general and specific property of all plant sucrose transporters (sucrose/biotin‐H+ symporters). This first report on a transporter with dual substrate specificity for two structurally unrelated molecules has a major impact on general thinking concerning the specificity of membrane transporters. The physiological relevance of this finding is discussed.

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“…Soweit Vergleiche möglich sind, sind auffallende Unterschiede in der Konzentration dieser wasserlöslichen Vitamine im Honigtau einerseits und in den Siebröhrensäften (Z IEGLER u. Z IEGLER , 1962) andererseits nicht festzustellen; d.h., die phloemausbeutenden Insekten nehmen die genannten, für sie fast durchwegs lebensnotwendigen (vgl. AIC LAIR , 1965: DA DD , K RIEGER u. M ITTLER , 1967) Vitamine etwa in gleichem Maße auf wie den Zucker, sodaß sich der Vitamingehalt bei Bezug auf den Zucker nicht wesentlich ändert.…”

Section: -Ergebnisse Und Diskussionunclassified