Investigation of the metal binding site in methionine aminopeptidase by density functional theory

Anne Techau Jørgensen, Per-Ola Norrby, Tommy Liljefors

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

All methionine aminopeptidases exhibit the same conserved metal binding site. The structure of this site with either Co2+ ions or Zn2+ ions was investigated using density functional theory. The calculations showed that the structure of the site was not influenced by the identity of the metal ions. This was the case for both of the systems studied; one based on the X-ray structure of the human methionine aminopeptidase type 2 (hMetAP-2) and the other based on the X-ray structure of the E. coli methionine aminopeptidase type 1 (eMetAP-1). Another important structural issue is the identity of the bridging oxygen, which is part of either a water molecule or a hydroxide ion. Within the site of hMetAP-2 the results strongly indicate that a hydroxide ion bridges the metal ions. By contrast, the nature of the oxygen bridging the metal ions within the metal binding site of eMetAP-1 cannot be determined based on the results here, due to the similar structural results obtained with a bridging water molecule and a bridging hydroxide ion.
Original languageEnglish
JournalJOURNAL OF COMPUTER-AIDED MOLECULAR DESIGN
Volume16
Issue number3
Pages (from-to)167-179
ISSN0920-654X
Publication statusPublished - 2002

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