Enzymes
| UniProtKB help_outline | 1 proteins |
| Enzyme class help_outline |
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Reaction participants Show >> << Hide
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Namehelp_outline
4-aminobutanoyl-[BtrI ACP]
Identifier
RHEA-COMP:13744
Reactive part
help_outline
- Name help_outline O-[S-4-aminobutanoylpantetheine-4'-phosphoryl]serine residue Identifier CHEBI:137997 Charge 0 Formula C18H33N4O9PS SMILEShelp_outline C(NC(CCNC(=O)[C@@H](C(COP(OC[C@@H](C(*)=O)N*)(=O)[O-])(C)C)O)=O)CSC(CCC[NH3+])=O 2D coordinates Mol file for the small molecule Search links Involved in 2 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
- Name help_outline ATP Identifier CHEBI:30616 (Beilstein: 3581767) help_outline Charge -4 Formula C10H12N5O13P3 InChIKeyhelp_outline ZKHQWZAMYRWXGA-KQYNXXCUSA-J SMILEShelp_outline Nc1ncnc2n(cnc12)[C@@H]1O[C@H](COP([O-])(=O)OP([O-])(=O)OP([O-])([O-])=O)[C@@H](O)[C@H]1O 2D coordinates Mol file for the small molecule Search links Involved in 1,280 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
- Name help_outline L-glutamate Identifier CHEBI:29985 (CAS: 11070-68-1) help_outline Charge -1 Formula C5H8NO4 InChIKeyhelp_outline WHUUTDBJXJRKMK-VKHMYHEASA-M SMILEShelp_outline [NH3+][C@@H](CCC([O-])=O)C([O-])=O 2D coordinates Mol file for the small molecule Search links Involved in 244 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
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Namehelp_outline
4-(γ-L-glutamylamino)butanoy-[BtrI ACP]
Identifier
RHEA-COMP:13745
Reactive part
help_outline
- Name help_outline O-[S-4-(γ-L-glutamylamino)butanoylpantetheine-4'-phosphoryl]serine residue Identifier CHEBI:137998 Charge -1 Formula C23H39N5O12PS SMILEShelp_outline C(NC(CCNC(=O)[C@@H](C(COP(OC[C@@H](C(*)=O)N*)(=O)[O-])(C)C)O)=O)CSC(CCCNC(CC[C@@H](C([O-])=O)[NH3+])=O)=O 2D coordinates Mol file for the small molecule Search links Involved in 2 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
- Name help_outline ADP Identifier CHEBI:456216 (Beilstein: 3783669) help_outline Charge -3 Formula C10H12N5O10P2 InChIKeyhelp_outline XTWYTFMLZFPYCI-KQYNXXCUSA-K SMILEShelp_outline Nc1ncnc2n(cnc12)[C@@H]1O[C@H](COP([O-])(=O)OP([O-])([O-])=O)[C@@H](O)[C@H]1O 2D coordinates Mol file for the small molecule Search links Involved in 841 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 9,431 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
- Name help_outline phosphate Identifier CHEBI:43474 Charge -2 Formula HO4P InChIKeyhelp_outline NBIIXXVUZAFLBC-UHFFFAOYSA-L SMILEShelp_outline OP([O-])([O-])=O 2D coordinates Mol file for the small molecule Search links Involved in 992 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
Cross-references
| RHEA:53952 | RHEA:53953 | RHEA:53954 | RHEA:53955 | |
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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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Biosynthesis of the unique amino acid side chain of butirosin: possible protective-group chemistry in an acyl carrier protein-mediated pathway.
Li Y., Llewellyn N.M., Giri R., Huang F., Spencer J.B.
Butirosins A and B are naturally occurring aminoglycoside antibiotics that have a (2S)-4-amino-2-hydroxybutyrate (AHBA) side chain. Semisynthetic addition of AHBA to clinically valuable aminoglycoside antibiotics has been shown both to improve their pharmacological properties and to prevent their ... >> More
Butirosins A and B are naturally occurring aminoglycoside antibiotics that have a (2S)-4-amino-2-hydroxybutyrate (AHBA) side chain. Semisynthetic addition of AHBA to clinically valuable aminoglycoside antibiotics has been shown both to improve their pharmacological properties and to prevent their deactivation by a number of aminoglycoside-modifying enzymes involved in bacterial resistance. We report here that the biosynthesis of AHBA from L-glutamate, encoded within a previously identified butirosin biosynthetic gene cluster, proceeds via intermediates tethered to a specific acyl carrier protein (ACP). Five components of the pathway have been purified and characterized, including the ACP (BtrI), an ATP-dependent ligase (BtrJ), a pyridoxal phosphate-dependent decarboxylase (BtrK), and a two-component flavin-dependent monooxygenase system (BtrO and the previously unreported BtrV). The proposed biosynthetic pathway includes a gamma-glutamylation of an ACP-derived gamma-aminobutyrate intermediate, possibly a rare example of protective group chemistry in biosynthesis. << Less
Chem. Biol. 12:665-675(2005) [PubMed] [EuropePMC]
This publication is cited by 4 other entries.
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Biosynthesis of butirosin: transfer and deprotection of the unique amino acid side chain.
Llewellyn N.M., Li Y., Spencer J.B.
Butirosin, an aminoglycoside antibiotic produced by Bacillus circulans, bears the unique (S)-4-amino-2-hydroxybutyrate (AHBA) side chain, which protects the antibiotic from several common resistance mechanisms. The AHBA side chain is advantageously incorporated into clinically valuable antibiotics ... >> More
Butirosin, an aminoglycoside antibiotic produced by Bacillus circulans, bears the unique (S)-4-amino-2-hydroxybutyrate (AHBA) side chain, which protects the antibiotic from several common resistance mechanisms. The AHBA side chain is advantageously incorporated into clinically valuable antibiotics such as amikacin and arbekacin by synthetic methods. Therefore, it is of significant interest to explore the biosynthetic origins of this useful moiety. We report here that the AHBA side chain of butirosin is transferred from the acyl carrier protein (ACP) BtrI to the parent aminoglycoside ribostamycin as a gamma-glutamylated dipeptide by the ACP:aminoglycoside acyltransferase BtrH. The protective gamma-glutamyl group is then cleaved by BtrG via an uncommon gamma-glutamyl cyclotransferase mechanism. The application of this pathway to the in vitro enzymatic production of novel AHBA-bearing aminoglycosides is explored with encouraging implications for the preparation of unnatural antibiotics via directed biosynthesis. << Less
Chem. Biol. 14:379-386(2007) [PubMed] [EuropePMC]
This publication is cited by 5 other entries.