1HYM

HYDROLYZED TRYPSIN INHIBITOR (CMTI-V, MINIMIZED AVERAGE NMR STRUCTURE)


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Submitted: 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Reactive-site hydrolyzed Cucurbita maxima trypsin inhibitor-V: function, thermodynamic stability, and NMR solution structure.

Cai, M.Gong, Y.Prakash, O.Krishnamoorthi, R.

(1995) Biochemistry 34: 12087-12094


  • PubMed Abstract: 
  • Reactive-site (Lys44-Asp45 peptide bond) hydrolyzed Cucurbita maxima trypsin inhibitor-V (CMTI-V*) was prepared and characterized: In comparison to the intact form, CMTI-V* exhibited markedly reduced inhibitory properties and binding affinities towar ...

    Reactive-site (Lys44-Asp45 peptide bond) hydrolyzed Cucurbita maxima trypsin inhibitor-V (CMTI-V*) was prepared and characterized: In comparison to the intact form, CMTI-V* exhibited markedly reduced inhibitory properties and binding affinities toward trypsin and human blood coagulation factor XIIa. The equilibrium constant of trypsin-catalyzed hydrolysis, Khyd, defined as [CMTI-V*]/[CMTI-V], was measured to be approximately 9.4 at 25 degrees C (delta G degrees = -1.3 kcal.mol-1). From the temperature dependence of delta G degrees, the following thermodynamic parameters were estimated: delta H degrees = 1.6 kcal.mol-1 and delta S degrees = 9.8 eu. In order to understand the functional and thermodynamic differences between the two forms, the three-dimensional solution structure of CMTI-V* was determined by a combined approach of NMR, distance geometry, and simulated annealing methods. Thus, following sequence-specific and stereospecific resonance assignments, including those of beta-, gamma-, delta-, and epsilon-hydrogens and valine methyl hydrogens, 809 interhydrogen distances and 123 dihedral angle constraints were determined, resulting in the computation and energy-minimization of 20 structures for CMTI-V*. The average root mean squared deviation in position for equivalent atoms between the 20 individual structures and the mean structure obtained by averaging their coordinates is 0.67 +/- 0.15 A for the main chain atoms and 1.19 +/- 0.23 A for all the non-hydrogen atoms of residues 5-40 and residues 48-67.(ABSTRACT TRUNCATED AT 250 WORDS)


    Related Citations: 
    • A New Protein Inhibitor of Trypsin and Activated Hageman Factor from Pumpkin (Cucurbita Maxima) Seeds
      Krishnamoorthi, R.,Gong, Y.,Richardson, M.
      (1990) FEBS Lett. 273: 163
    • Three-Dimensional Solution Structure of Cucurbita Maxima Trypsin Inhibitor-V Determined by NMR Spectroscopy
      Cai, M.,Gong, Y.,Kao, J.L.F.,Krishnamoorthi, R.
      (1995) Biochemistry 34: 5201


    Organizational Affiliation

    Department of Biochemistry, Kansas State University, Manhattan 66506, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
HYDROLYZED CUCURBITA MAXIMA TRYPSIN INHIBITOR V
A
45Cucurbita maximaN/A
Find proteins for P19873 (Cucurbita maxima)
Go to UniProtKB:  P19873
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
HYDROLYZED CUCURBITA MAXIMA TRYPSIN INHIBITOR V
B
24Cucurbita maximaN/A
Find proteins for P19873 (Cucurbita maxima)
Go to UniProtKB:  P19873
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
ACE
Query on ACE
A
NON-POLYMERC2 H4 O

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Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Submitted: 

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1995-09-15
    Type: Initial release
  • Version 1.1: 2008-03-24
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance
  • Version 1.3: 2017-11-29
    Type: Derived calculations, Other