Enzymes
| UniProtKB help_outline | 3 proteins |
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- Name help_outline phytyl diphosphate Identifier CHEBI:75434 Charge -3 Formula C20H39O7P2 InChIKeyhelp_outline ITPLBNCCPZSWEU-PYDDKJGSSA-K SMILEShelp_outline CC(C)CCC[C@@H](C)CCC[C@@H](C)CCC\C(C)=C\COP([O-])(=O)OP([O-])([O-])=O 2D coordinates Mol file for the small molecule Search links Involved in 8 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
- Name help_outline chlorophyllide a Identifier CHEBI:83348 Charge -2 Formula C35H32MgN4O5 InChIKeyhelp_outline IZOAGQOHKWGYKF-PVMVIUQGSA-K SMILEShelp_outline CCC1=C(C)C2=[N+]3C1=Cc1c(C)c4C(=O)[C-](C(=O)OC)C5=C6[C@@H](CCC([O-])=O)[C@H](C)C7=[N+]6[Mg--]3(n1c45)n1c(=C7)c(C)c(C=C)c1=C2 2D coordinates Mol file for the small molecule Search links Involved in 13 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
- Name help_outline H+ Identifier CHEBI:15378 Charge 1 Formula H InChIKeyhelp_outline GPRLSGONYQIRFK-UHFFFAOYSA-N SMILEShelp_outline [H+] 2D coordinates Mol file for the small molecule Search links Involved in 9,717 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
- Name help_outline chlorophyll a Identifier CHEBI:58416 Charge -1 Formula C55H71MgN4O5 InChIKeyhelp_outline VSRAJQZEEBBURZ-ONWAGYJKSA-M SMILEShelp_outline CCC1=C(C)C2=Cc3c(C=C)c(C)c4C=C5[C@@H](C)[C@H](CCC(=O)OC\C=C(/C)CCC[C@H](C)CCC[C@H](C)CCCC(C)C)C6=[N+]5[Mg--]5(n34)n3c(=CC1=[N+]25)c(C)c1C(=O)[C-](C(=O)OC)C6=c31 2D coordinates Mol file for the small molecule Search links Involved in 4 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
- Name help_outline diphosphate Identifier CHEBI:33019 (Beilstein: 185088) help_outline Charge -3 Formula HO7P2 InChIKeyhelp_outline XPPKVPWEQAFLFU-UHFFFAOYSA-K SMILEShelp_outline OP([O-])(=O)OP([O-])([O-])=O 2D coordinates Mol file for the small molecule Search links Involved in 1,146 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
Cross-references
| RHEA:17317 | RHEA:17318 | RHEA:17319 | RHEA:17320 | |
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| Reaction direction help_outline | undefined | left-to-right | right-to-left | bidirectional |
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Publications
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Pre-loading of chlorophyll synthase with tetraprenyl diphosphate is an obligatory step in chlorophyll biosynthesis.
Schmid H.C., Rassadina V., Oster U., Schoch S., Ruediger W.
The reaction of recombinant chlorophyll synthase from Avena sativa, expressed in Escherichia coli, was investigated. To verify the identity of the recombinant and native enzymes, reaction rates were determined for both enzyme preparations with several chlorophyllide analogs. The rates of esterific ... >> More
The reaction of recombinant chlorophyll synthase from Avena sativa, expressed in Escherichia coli, was investigated. To verify the identity of the recombinant and native enzymes, reaction rates were determined for both enzyme preparations with several chlorophyllide analogs. The rates of esterification of these modified substrates ranged from 0 to 100% of the rate with the natural substrate, and were nearly identical for both enzyme preparations. The Lineweaver-Burk plot for variation of both chlorophyllide a and phytyl diphosphate concentration showed parallel lines, indicative of a 'ping-pong' mechanism. Pre-incubation with phytyl diphosphate exhibited an initial rapid reaction phase, which did not occur after pre-incubation with chlorophyllide. We conclude that the tetraprenyl diphosphate must bind to the enzyme as the first substrate and esterification occurs when this pre-loaded enzyme meets the second substrate, chlorophyllide. Approximately 10-17% of the recombinant enzyme were pre-loaded with phytyl diphosphate under the experimental conditions. The rapid reaction phase is also observed for the chlorophyll synthase reaction in etiolated barley leaves in addition to the well-known slow phase. This indicates that pre-loading of the enzyme with tetraprenyl diphosphate is also the basis for the reaction in vivo. << Less
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Characterization of chlorophyll a and bacteriochlorophyll a synthases by heterologous expression in Escherichia coli.
Oster U., Bauer C.E., Rudiger W.
Genes coding for putative chlorophyll a synthase (chlG) from Synechocystis sp. PCC 6803 and bacteriochlorophyll a synthase (bchG) from Rhodobacter capsulatus were amplified by the polymerase chain reaction and cloned into T7 RNA polymerase-based expression plasmids. In vitro enzymatic assays indic ... >> More
Genes coding for putative chlorophyll a synthase (chlG) from Synechocystis sp. PCC 6803 and bacteriochlorophyll a synthase (bchG) from Rhodobacter capsulatus were amplified by the polymerase chain reaction and cloned into T7 RNA polymerase-based expression plasmids. In vitro enzymatic assays indicated that heterologous expression of the chlG and bchG gene products in Escherichia coli conferred chlorophyll a and bacteriochlorophyll a synthase activity, respectively. Chlorophyll a synthase utilized chlorophyllide a, but not bacteriochlorophyllide a, as a substrate, whereas bacteriochlorophyll a synthase utilized bacteriochlorophyllide a, but not chlorophyllide a. Both enzymes were also observed to exhibit a marked preference for phytyl diphosphate over geranylgeranyl diphosphate. << Less
J Biol Chem 272:9671-9676(1997) [PubMed] [EuropePMC]
This publication is cited by 1 other entry.