3PHM

REDUCED (CU+) PEPTIDYLGLYCINE ALPHA-HYDROXYLATING MONOOXYGENASE (PHM)

Summary for 3PHM

• Entry DOI: 10.2210/pdb3phm/pdb
• Related: 1OPM 1PHM
• Descriptor: PROTEIN (PEPTIDYLGLYCINE ALPHA-HYDROXYLATING MONOOXYGENASE), COPPER (II) ION, AZIDE ION, ... (6 entities in total)
• Functional Keywords: monooxygenase, bioactive peptide activation, ascorbate, oxidoreductase
• Biological source: Rattus norvegicus (Norway rat)
• Cellular location: Cytoplasmic vesicle, secretory vesicle membrane; Single-pass membrane protein: P14925
• Total number of polymer chains: 1
• Total formula weight: 35265.92

Authors

Prigge, S.T.,Amzel, L.M. (deposition date: 1999-05-25, release date: 1999-09-29, Last modification date: 2024-10-30)

Primary citation

Prigge, S.T.,Kolhekar, A.S.,Eipper, B.A.,Mains, R.E.,Amzel, L.M.
Substrate-mediated electron transfer in peptidylglycine alpha-hydroxylating monooxygenase.
Nat.Struct.Biol., 6:976-983, 1999

PubMed Abstract: Peptide amidation is a ubiquitous posttranslational modification of bioactive peptides. Peptidylglycine alpha-hydroxylating monooxygenase (PHM; EC 1.14.17.3), the enzyme that catalyzes the first step of this reaction, is composed of two domains, each of which binds one copper atom. The coppers are held 11 A apart on either side of a solvent-filled interdomain cleft, and the PHM reaction requires electron transfer between these sites. A plausible mechanism for electron transfer might involve interdomain motion to decrease the distance between the copper atoms. Our experiments show that PHM catalytic core (PHMcc) is enzymatically active in the crystal phase, where interdomain motion is not possible. Instead, structures of two states relevant to catalysis indicate that water, substrate and active site residues may provide an electron transfer pathway that exists only during the PHM catalytic cycle.

PubMed: 10504734
DOI: 10.1038/13351

Experimental method

X-RAY DIFFRACTION (2.1 Å)