1MTJ

PHE46(CD4) ORIENTS THE DISTAL HISTIDINE FOR HYDROGEN BONDING TO BOUND LIGANDS IN SPERM WHALE MYOGLOBIN


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.70 Å
  • R-Value Work: 0.162 
  • R-Value Observed: 0.162 

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This is version 1.3 of the entry. See complete history


Literature

Phe-46(CD4) orients the distal histidine for hydrogen bonding to bound ligands in sperm whale myoglobin.

Lai, H.H.Li, T.Lyons, D.S.Phillips Jr., G.N.Olson, J.S.Gibson, Q.H.

(1995) Proteins 22: 322-339

  • DOI: https://doi.org/10.1002/prot.340220404
  • Primary Citation of Related Structures:  
    1MTI, 1MTJ, 1MTK

  • PubMed Abstract: 

    The role of Phe-46(CD4) in modulating the functional properties of sperm whale myoglobin was investigated by replacing this residue with Leu, Ile, Val, Ala, Trp, Tyr, and Glu. This highly conserved amino acid almost makes direct contact with the distal histidine and has been postulated to affect ligand binding. The overall association rate constants for CO, O2, and NO binding were little affected by decreasing the size of residue 46 step-wise from Phe to Leu to Val to Ala. In contrast, the rates of CO, O2, and NO dissociation increased 4-, 10-, and 25-fold, respectively, for the same series of mutants, causing large decreases in the affinity of myoglobin for all three diatomic gases. The rates of autooxidation at 37 degrees C, pH 7.0 increased dramatically from approximately 0.1-0.3 h-1 for wild-type, Tyr-46, and Trp-46 myoglobins to 1.5, 5.2, 4.9, and 5.0 h-1 for the Leu-46, Ile-46, Val-46 and Ala-46 mutants, respectively. Rates of NO and O2 geminate recombination were measured using 35 ps and 9 ns laser excitation pulses. Decreasing the size of residue 46 causes significant decreases in the extent of both picosecond and nanosecond rebinding processes. High resolution structures of Leu-46 and Val-46 metmyoglobins, Val-46 CO-myoglobin, and Val-46 deoxymyoglobin were determined by X-ray crystallography. When Phe-46 is replaced by Val, the loss of internal packing volume is compensated by (1) contraction of the CD corner toward the core of the protein, (2) movement of the E-helix toward the mutation site, (3) greater exposure of the distal pocket to intruding solvent molecules, and (4) large disorder in the position of the side chain of the distal histidine (His-64). In wild-type myoglobin, the van der Waals contact between C zeta of Phe-46 and C beta of His-64 appears to restrict rotation of the imidazole side chain. Insertion of Val at position 46 relieves this steric restriction, allowing the imidazole side chain to rotate about the C alpha - C beta bond toward the surface of the globin and about the C beta - C gamma bond toward the space previously occupied by the native Phe-46 side chain. This movement disrupts hydrogen bonding with bound ligands, causing significant decreases in affinity, and opens the distal pocket to solvent water molecules, causing marked increases in the rate of autooxidation.(ABSTRACT TRUNCATED AT 400 WORDS)


  • Organizational Affiliation

    Department of Biochemistry and Cell Biology, Rice University, Houston, Texas 77005-1892, USA.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
MYOGLOBIN154Physeter macrocephalusMutation(s): 0 
Gene Names: SYNTHETIC
EC: 1.11.1 (UniProt), 1.7 (UniProt)
UniProt
Find proteins for P02185 (Physeter macrocephalus)
Explore P02185 
Go to UniProtKB:  P02185
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP02185
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.70 Å
  • R-Value Work: 0.162 
  • R-Value Observed: 0.162 
  • Space Group: P 6
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 91.65α = 90
b = 91.65β = 90
c = 45.91γ = 120
Software Package:
Software NamePurpose
X-PLORmodel building
X-PLORrefinement
X-PLORphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 1995-09-15
    Type: Initial release
  • Version 1.1: 2008-03-24
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2024-02-14
    Changes: Data collection, Database references, Derived calculations, Other