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Literature summary extracted from

  • Clementz, T.; Bednarski, J.J.; Raetz, C.R.
    Function of the htrB high temperature requirement gene of Escherchia coli in the acylation of lipid A: HtrB catalyzed incorporation of laurate (1996), J. Biol. Chem., 271, 12095-12102.
    View publication on PubMed

Activating Compound

EC Number Activating Compound Comment Organism Structure
2.3.1.241 Triton X-100 in the presence of 1 or 5 mM MgCl2, the enzyme shows a dependence on added detergen. With Triton X-100, the highest activity is observed between 0.1 and 0.2% (w/v). At higher Triton X-100 concentrations, the activity dropps off, presumably because of surface dilution of the substrate in mixed micelles. At 5 mM MgCl2, the Triton X-100 optimum is considerably broader Escherichia coli

General Stability

EC Number General Stability Organism
2.3.1.241 the addition of 50 mM NaCl together with 5 mM MgCl2 to the reaction mixture stabilizes the enzyme to preincubation Escherichia coli

Metals/Ions

EC Number Metals/Ions Comment Organism Structure
2.3.1.241 MgCl2 in the presence of 1 or 5 mM MgCl2, the enzyme shows a dependence on added detergent. At 5 mM MgCl2, the Triton X-100 optimum is considerably broad and therefore 5 mM MgCl2 is included in the assays Escherichia coli

Natural Substrates/ Products (Substrates)

EC Number Natural Substrates Organism Comment (Nat. Sub.) Natural Products Comment (Nat. Pro.) Rev. Reac.
2.3.1.241 a dodecanoyl-[acyl-carrier protein] + (3-deoxy-alpha-D-manno-oct-2-ulopyranosylonate)-(2->4)-(3-deoxy-alpha-D-manno-oct-2-ulopyranosylonate)-(2->6)-2-deoxy-2-[[(3R)-3-hydroxytetradecanoyl]amino]-3-O-[(3R)-3-hydroxytetradecanoyl]-4-O-phosphono-beta-D-glucopyranosyl-(1->6)-2-deoxy-3-O-[(3R)-3-hydroxytetradecanoyl]-2-[[(3R)-3-hydroxytetradecanoyl]amino]-1-O-phosphono-alpha-D-glucopyranose Escherichia coli i.e. alpha-Kdo-(2->4)-alpha-Kdo-(2->6)-lipid IVA (3-deoxy-alpha-D-manno-oct-2-ulopyranosylonate)-(2->4)-(3-deoxy-alpha-D-manno-oct-2-ulopyranosylonate)-(2->6)-2-deoxy-2-[[(3R)-3-(dodecanoyloxy)tetradecanoyl]amino]-3-O-[(3R)-3-hydroxytetradecanoyl]-4-O-phosphono-beta-D-glucopyranosyl-(1->6)-2-deoxy-3-O-[(3R)-3-hydroxytetradecanoyl]-2-[[(3R)-3-hydroxytetradecanoyl]amino]-1-O-phosphono-alpha-D-glucopyranose + an [acyl-carrier protein]
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 ?

Organism

EC Number Organism UniProt Comment Textmining
2.3.1.241 Escherichia coli
-
-
-

Purification (Commentary)

EC Number Purification (Comment) Organism
2.3.1.241
-
 Escherichia coli

Specific Activity [micromol/min/mg]

EC Number Specific Activity Minimum [µmol/min/mg] Specific Activity Maximum [µmol/min/mg] Comment Organism
2.3.1.241 2.2
-
 pH 7.5, 30°C Escherichia coli

Substrates and Products (Substrate)

EC Number Substrates Comment Substrates Organism Products Comment (Products) Rev. Reac.
2.3.1.241 a dodecanoyl-[acyl-carrier protein] + (3-deoxy-alpha-D-manno-oct-2-ulopyranosylonate)-(2->4)-(3-deoxy-alpha-D-manno-oct-2-ulopyranosylonate)-(2->6)-2-deoxy-2-[[(3R)-3-hydroxytetradecanoyl]amino]-3-O-[(3R)-3-hydroxytetradecanoyl]-4-O-phosphono-beta-D-glucopyranosyl-(1->6)-2-deoxy-3-O-[(3R)-3-hydroxytetradecanoyl]-2-[[(3R)-3-hydroxytetradecanoyl]amino]-1-O-phosphono-alpha-D-glucopyranose i.e. alpha-Kdo-(2->4)-alpha-Kdo-(2->6)-lipid IVA Escherichia coli (3-deoxy-alpha-D-manno-oct-2-ulopyranosylonate)-(2->4)-(3-deoxy-alpha-D-manno-oct-2-ulopyranosylonate)-(2->6)-2-deoxy-2-[[(3R)-3-(dodecanoyloxy)tetradecanoyl]amino]-3-O-[(3R)-3-hydroxytetradecanoyl]-4-O-phosphono-beta-D-glucopyranosyl-(1->6)-2-deoxy-3-O-[(3R)-3-hydroxytetradecanoyl]-2-[[(3R)-3-hydroxytetradecanoyl]amino]-1-O-phosphono-alpha-D-glucopyranose + an [acyl-carrier protein]
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 ?
2.3.1.241 a dodecanoyl-[acyl-carrier protein] + (3-deoxy-alpha-D-manno-oct-2-ulopyranosylonate)-(2->4)-(3-deoxy-alpha-D-manno-oct-2-ulopyranosylonate)-(2->6)-2-deoxy-2-[[(3R)-3-hydroxytetradecanoyl]amino]-3-O-[(3R)-3-hydroxytetradecanoyl]-4-O-phosphono-beta-D-glucopyranosyl-(1->6)-2-deoxy-3-O-[(3R)-3-hydroxytetradecanoyl]-2-[[(3R)-3-hydroxytetradecanoyl]amino]-1-O-phosphono-alpha-D-glucopyranose the purified enzyme rapidly incorporates one dodecanoate into alpha-Kdo-(2->4)-alpha-Kdo-(2->6)-lipid IVA. The rate of dodecanoate incorporation is reduced by several orders of magnitude when either one or both Kdos are absent in the acceptor. The enzyme incorporates dodecanoate 3–8 times faster than decanoate or tetradecanoate, respectively. Transfer of palmitate, palmitoleate, or R-3-hydroxymyristate is very slow Escherichia coli (3-deoxy-alpha-D-manno-oct-2-ulopyranosylonate)-(2->4)-(3-deoxy-alpha-D-manno-oct-2-ulopyranosylonate)-(2->6)-2-deoxy-2-[[(3R)-3-(dodecanoyloxy)tetradecanoyl]amino]-3-O-[(3R)-3-hydroxytetradecanoyl]-4-O-phosphono-beta-D-glucopyranosyl-(1->6)-2-deoxy-3-O-[(3R)-3-hydroxytetradecanoyl]-2-[[(3R)-3-hydroxytetradecanoyl]amino]-1-O-phosphono-alpha-D-glucopyranose + an [acyl-carrier protein]
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 ?

Synonyms

EC Number Synonyms Comment Organism
2.3.1.241 htrB
-
 Escherichia coli

Temperature Optimum [°C]

EC Number Temperature Optimum [°C] Temperature Optimum Maximum [°C] Comment Organism
2.3.1.241 30
-
 assay at Escherichia coli

pH Optimum

EC Number pH Optimum Minimum pH Optimum Maximum Comment Organism
2.3.1.241 7.5
-
 assay at Escherichia coli