1IXU

Solution structure of marinostatin, a protease inhibitor, containing two ester linkages


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 50 
  • Conformers Submitted: 
  • Selection Criteria: structures with the lowest violation 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Solution structure of marinostatin, a natural ester-linked protein protease inhibitor

Kanaori, K.Kamei, K.Taniguchi, M.Koyama, T.Yasui, T.Takano, R.Imada, C.Tajima, K.Hara, S.

(2005) Biochemistry 44: 2462-2468

  • DOI: 10.1021/bi048034x
  • Primary Citation of Related Structures:  
    1IXU

  • PubMed Abstract: 
  • Marinostatin is a unique protein protease inhibitor containing two ester linkages. We have purified a 12-residue marinostatin [MST(1-12), (1)FATMRYPSDSDE(12)] and determined the residues involved in the formation of the ester linkages and the solution structure by (1)H NMR spectroscopy and restrained molecular dynamics calculation ...

    Marinostatin is a unique protein protease inhibitor containing two ester linkages. We have purified a 12-residue marinostatin [MST(1-12), (1)FATMRYPSDSDE(12)] and determined the residues involved in the formation of the ester linkages and the solution structure by (1)H NMR spectroscopy and restrained molecular dynamics calculation. The two ester linkages of MST(1-12) are formed between hydroxyl and carboxyl groups, Thr(3)-Asp(9) and Ser(8)-Asp(11), indicating that MST(1-12) has two cyclic regions which are fused at the residues of Ser(8) and Asp(9). A strong NOE cross-peak between Tyr(6) H(alpha) and Pro(7) H(alpha) was observed, indicating that the Pro(7) residue takes a cis-conformation. Well-converged structures and hydrogen-deuterium experiments of MST(1-12) showed that the backbone NH proton of the P1'residue, Arg(5), is hydrogen-bonded to the carbonyl oxygen of the ester linkage between Thr(3) and Asp(9). To reveal the significance of the ester linkages, a marinostatin analogue, MST-2SS ((1)FACMRYPCCSCE(12)) with two disulfide bridges of Cys(3)-Cys(9) and Cys(8)-Cys(11), was also synthesized. The inhibitory activity of MST-2SS was as strong as that of MST(1-12), and the Pro(7) residue of MST-2SS also takes a cis-conformation. However, the exchange rate of the Arg(5) NH proton of MST-2SS was about 100 times faster than that of MST(1-12), and the structure calculation of MST-2SS was not converged on account of the small number of NOEs, indicating that MST-2SS takes a more flexible structure. The hydrogen acceptability of the ester linkage formed by the P2 position residue, Thr(3), is crucial for suppressing the fluctuation of the reactive site and sustaining the inhibitory activity, which enables marinostatin to be one of the smallest protease inhibitors in nature.


    Organizational Affiliation

    Department of Applied Biology, Kyoto Institute of Technology, Matsugasaki, Japan.



Macromolecules

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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
marinostatinA12Alteromonas sp. B-10-31Mutation(s): 0 
Gene Names: mstI
UniProt
Find proteins for P29399 (Alteromonas sp. (strain B-10-31))
Explore P29399 
Go to UniProtKB:  P29399
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UniProt GroupP29399
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 50 
  • Conformers Submitted: 
  • Selection Criteria: structures with the lowest violation 

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2004-02-17
    Type: Initial release
  • Version 1.1: 2008-04-27
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Source and taxonomy, Version format compliance