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104  structures 1240  species 1  interaction 2389  sequences 27  architectures

# Summary: Phosphoenolpyruvate phosphomutase

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This is the Wikipedia entry entitled "Phosphoenolpyruvate mutase". More...

# Phosphoenolpyruvate mutase

phosphoenolpyruvate mutase
Identifiers
EC number 5.4.2.9
CAS number 115756-49-5
Databases
IntEnz IntEnz view
BRENDA BRENDA entry
ExPASy NiceZyme view
KEGG KEGG entry
MetaCyc metabolic pathway
PRIAM profile
PDB structures RCSB PDB PDBe PDBsum
Gene Ontology AmiGO / EGO

In enzymology, a phosphoenolpyruvate mutase (EC 5.4.2.9) is an enzyme that catalyzes the chemical reaction

phosphoenolpyruvate ${\displaystyle \rightleftharpoons }$ 3-phosphonopyruvate

Hence, this enzyme has one substrate, phosphoenolpyruvate (PEP), and one product, 3-phosphonopyruvate (PPR), which are structural isomers.

This enzyme belongs to the family of isomerases, specifically the phosphotransferases (phosphomutases), which transfer phosphate groups within a molecule. The systematic name of this enzyme class is phosphoenolpyruvate 2,3-phosphonomutase. Other names in common use include phosphoenolpyruvate-phosphonopyruvate phosphomutase, PEP phosphomutase, phosphoenolpyruvate phosphomutase, PEPPM, and PEP phosphomutase. This enzyme participates in aminophosphonate metabolism.

Phosphoenolpyruvate mutase was discovered in 1988.[1][2]

## Structural studies

As of late 2007, 6 structures have been solved for this class of enzymes, all by the Herzberg group [1] at the University of Maryland using PEPPM from the blue mussel, Mytilus edulis. The first structure (PDB accession code 1PYM) was solved in 1999 and featured a magnesium oxalate inhibitor.[3] This structure identified the enzyme as consisting of identical beta barrel subunits (exhibiting the TIM barrel fold, which consists of eight parallel beta strands). Dimerization was observed in which a helix from each subunit interacts with the other subunit's barrel; the authors called this feature "helix swapping." The dimers can dimerize as well to form a homotetrameric enzyme. A double phosphoryl transfer mechanism was proposed on the basis of this study: this would involve breakage of PEP's phosphorus-oxygen bond to form a phosphoenzyme intermediate, followed by transfer of the phosphoryl group from the enzyme to carbon-3, forming PPR.

However, more recently, a structure with a sulfopyruvate inhibitor, which is a closer substrate analogue, was solved (1M1B);[4] this study supported instead a dissociative mechanism. A notable feature of these structures was the shielding of the active site from solvent; it was proposed that a significant conformational change takes place on binding to allow this, moving the protein from an "open" to a "closed" state, and this was supported by several crystal structures in the open state.[5] Three of these were of the wild type: the apoenzyme in 1S2T, the enzyme plus its magnesium ion cofactor in 1S2V, and the enzyme at high ionic strength in 1S2W. A mutant (D58A, in one of the active-site loops) was crystallized as an apoenzyme also (1S2U). From these structures, an active-site "gating" loop (residues 115-133) that shields the substrate from solvent in the closed conformation was identified.

The two conformations, taken from the crystal structures 1M1B (closed) and 1S2T (open), are docked into each other in the images below; they differ negligibly except in the gating loop, which is colored purple for the closed conformation and blue for the open conformation. In the active-site closeup (left), several sidechains (cyan) that have been identified as important in catalysis are included as well; the overview (right) illustrates the distinctive helix-swapping fold. The images are still shots from ribbon kinemages. Both of these structures were crystallized as dimers. In chain A (used for the active-site closeup), helices are red while loops (other than the gating loop) are white and beta strands are green; in chain B, helices are yellow, beta strands are olive, and loops are gray; these colors are the same for the closed and open structures. Magnesium ions are gray and the sulfopyruvate ligands are pink; both are from the closed structure (though the enzyme has also been crystallized with only magnesium bound, and it adopted an open conformation).

The structure of PEPPM is very similar to that of methylisocitrate lyase, an enzyme involved in propanoate metabolism whose substrate is also a low-molecular weight carboxylic acid—the beta-barrel structure as well as the active site layout and multimerization geometry are the same. Isocitrate lyase is also quite similar, though each subunit has a second, smaller beta domain in addition to the main beta barrel.

## Mechanism

Phosphoenolpyruvate mutase is thought to exhibit a dissociative mechanism.[4] A magnesium ion is involved as a cofactor. The phosphoryl/phosphate group also appears to interact ionically with Arg159 and His190, stabilizing the reactive intermediate. A phosphoenzyme intermediate is unlikely because the most feasible residues for the covalent adduct can be mutated with only partial loss of function. The reaction involves dissociation of phosphorus from oxygen 2 and then a nucleophilic attack by carbon 3 on phosphorus. Notably, the configuration is retained at phosphorus, i.e. carbon 3 of PPR adds to the same face of phosphorus from which oxygen 2 of PEP was removed; this would be unlikely for a non-enzyme-catalyzed dissociative mechanism, but since the reactive intermediate interacts strongly with the amino acids and magnesium ions of the active site, it is to be expected in the presence of enzyme catalysis.

Residues in the active-site gating loop, particularly Lys120, Asn122, and Leu124, also appear to interact with the substrate and reactive intermediate; these interactions explain why the loop moves into the closed conformation on substrate binding.

## Biological function

Because phosphoenolpyruvate mutase has the unusual ability to form a new carbon-phosphorus bond, it is essential to the synthesis of phosphonates, such as phosphonolipids and the antibiotics fosfomycin and bialaphos. The formation of this bond is quite thermodynamically unfavorable; even though PEP is a very high-energy phosphate compound, the equilibrium in PEP-PPR interconversion still favors PEP.[1] The enzyme phosphonopyruvate decarboxylase presents a solution to this problem: it catalyzes the very thermodynamically favorable decarboxylation of PPR, and the resulting 2-phosphonoacetaldehyde is then converted into biologically useful phosphonates. This allows phosphoneolpyruvate's reaction to proceed in the forward direction, due to Le Chatelier's principle. The decarboxylation removes product quickly, and thus the reaction moves forward even though there would be much more reactant than product if the system were allowed to reach equilibrium by itself.

The enzyme carboxyphosphoenolpyruvate phosphonomutase performs a similar reaction, converting P-carboxyphosphoenolpyruvate to phosphinopyruvate and carbon dioxide. [2] [6]

## References

1. ^ a b Bowman E, McQueney M, Barry RJ, Dunaway-Mariano D (1988). "Catalysis and thermodynamics of the phosphoenolpyruvate phosphonopyruvate rearrangement - entry into the phosphonate class of naturally-occurring organo-phosphorus compounds". J. Am. Chem. Soc. 110 (16): 5575–5576. doi:10.1021/ja00224a054.
2. ^ Seidel HM, Freeman S, Seto H, Knowles JR (1988). "Phosphonate biosynthesis: isolation of the enzyme responsible for the formation of a carbon-phosphorus bond". Nature. 335 (6189): 457–458. doi:10.1038/335457a0. PMID 3138545.
3. ^ Huang K, Li Z, Jia Y, Dunaway-Mariano D, Herzberg O (1999). "Helix swapping between two alpha/beta barrels: crystal structure of phosphoenolpyruvate mutase with bound Mg(2+)-oxalate". Structure Fold. Des. 7 (5): 539–48. doi:10.1016/S0969-2126(99)80070-7. PMID 10378273.
4. ^ a b Liu S, Lu Z, Jia Y, Dunaway-Mariano D, Herzberg O (2002). "Dissociative phosphoryl transfer in PEP mutase catalysis: structure of the enzyme/sulfopyruvate complex and kinetic properties of mutants". Biochemistry. 41 (32): 10270–10276. doi:10.1021/bi026024v. PMID 12162742.
5. ^ Liu S, Lu Z, Han Y, Jia Y, Howard A, Dunaway-Mariano D, Herzberg O (2004). "Conformational flexibility of PEP mutase". Biochemistry. 43 (15): 4447–4453. doi:10.1021/bi036255h. PMID 15078090.
6. ^ Hidaka T, Imai S, Hara O, Anzai H, Murakami T, Nagaoka K, Seto H (1990). "Carboxyphosphonoenolpyruvate phosphonomutase, a novel enzyme catalyzing C-P bond formation". J. Bacteriol. 172 (6): 3066–72. PMC . PMID 2160937.

This tab holds the annotation information that is stored in the Pfam database. As we move to using Wikipedia as our main source of annotation, the contents of this tab will be gradually replaced by the Wikipedia tab.

# Phosphoenolpyruvate phosphomutase

This domain includes the enzyme Phosphoenolpyruvate phosphomutase ( EC:5.4.2.9). This protein O86937 has been characterised as catalysing the formation of a carbon-phosphorus bond by converting phosphoenolpyruvate (PEP) to phosphonopyruvate (P-Pyr) [1]. This enzyme has a TIM barrel fold.

## Literature references

1. Schwartz D, Recktenwald J, Pelzer S, Wohlleben W;, FEMS Microbiol Lett. 1998;163:149-157.: Isolation and characterization of the PEP-phosphomutase and the phosphonopyruvate decarboxylase genes from the phosphinothricin tripeptide producer Streptomyces viridochromogenes Tu494. PUBMED:9673017 EPMC:9673017

This tab holds annotation information from the InterPro database.

No InterPro data for this Pfam family.

# Domain organisation

Below is a listing of the unique domain organisations or architectures in which this domain is found. More...

# Pfam Clan

This family is a member of clan PK_TIM (CL0151), which has the following description:

This superfamily consists of a number of TIM barrel domains found in enzymes such as pyruvate kinase, malate synthase and citrate lyase.

The clan contains the following 11 members:

PEP_mutase

# Alignments

We store a range of different sequence alignments for families. As well as the seed alignment from which the family is built, we provide the full alignment, generated by searching the sequence database (reference proteomes) using the family HMM. We also generate alignments using four representative proteomes (RP) sets, the UniProtKB sequence database, the NCBI sequence database, and our metagenomics sequence database. More...

## View options

We make a range of alignments for each Pfam-A family. You can see a description of each above. You can view these alignments in various ways but please note that some types of alignment are never generated while others may not be available for all families, most commonly because the alignments are too large to handle.

Seed
(82)
Full
(2389)
Representative proteomes UniProt
(10239)
NCBI
(21987)
Meta
(3268)
RP15
(408)
RP35
(1459)
RP55
(2972)
RP75
(5045)
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PP/heatmap 1 View

1Cannot generate PP/Heatmap alignments for seeds; no PP data available

Key: available, not generated, not available.

## Format an alignment

Seed
(82)
Full
(2389)
Representative proteomes UniProt
(10239)
NCBI
(21987)
Meta
(3268)
RP15
(408)
RP35
(1459)
RP55
(2972)
RP75
(5045)
Alignment:
Format:
Order:
Sequence:
Gaps:

We make all of our alignments available in Stockholm format. You can download them here as raw, plain text files or as gzip-compressed files.

Seed
(82)
Full
(2389)
Representative proteomes UniProt
(10239)
NCBI
(21987)
Meta
(3268)
RP15
(408)
RP35
(1459)
RP55
(2972)
RP75
(5045)

You can also download a FASTA format file containing the full-length sequences for all sequences in the full alignment.

# HMM logo

HMM logos is one way of visualising profile HMMs. Logos provide a quick overview of the properties of an HMM in a graphical form. You can see a more detailed description of HMM logos and find out how you can interpret them here. More...

# Trees

This page displays the phylogenetic tree for this family's seed alignment. We use FastTree to calculate neighbour join trees with a local bootstrap based on 100 resamples (shown next to the tree nodes). FastTree calculates approximately-maximum-likelihood phylogenetic trees from our seed alignment.

# Curation and family details

This section shows the detailed information about the Pfam family. You can see the definitions of many of the terms in this section in the glossary and a fuller explanation of the scoring system that we use in the scores section of the help pages.

## Curation

 Seed source: Jackhmmer:A1B6C5 Previous IDs: none Type: Domain Author: Bateman A Number in seed: 82 Number in full: 2389 Average length of the domain: 239.80 aa Average identity of full alignment: 30 % Average coverage of the sequence by the domain: 76.68 %

## HMM information

HMM build commands:
build method: hmmbuild -o /dev/null HMM SEED
search method: hmmsearch -Z 17690987 -E 1000 --cpu 4 HMM pfamseq
Model details:
Parameter Sequence Domain
Gathering cut-off 30.0 30.0
Trusted cut-off 30.0 30.0
Noise cut-off 29.9 29.9
Model length: 239
Family (HMM) version: 4

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