4XQ1

Crystal structure of hemerythrin: L114A mutant

Summary for 4XQ1

• Entry DOI: 10.2210/pdb4xq1/pdb
• Related: 4xpw 4xpx 4xpy
• Descriptor: Bacteriohemerythrin, FE (III) ION, NITRATE ION, ... (5 entities in total)
• Functional Keywords: oxygen binding protein
• Biological source: Methylococcus capsulatus str. Bath
• Total number of polymer chains: 1
• Total formula weight: 14891.27

Authors

Chuankhayan, P.,Chen, K.H.C.,Wu, H.H.,Chen, C.J.,Fukuda, M.,Yu, S.S.F.,Chan, S.I. (deposition date: 2015-01-18, release date: 2015-04-29, Last modification date: 2024-03-20)

Primary citation

Chen, K.H.C.,Chuankhayan, P.,Wu, H.H.,Chen, C.J.,Fukuda, M.,Yu, S.S.F.,Chan, S.I.
The bacteriohemerythrin from Methylococcus capsulatus (Bath): Crystal structures reveal that Leu114 regulates a water tunnel.
J.Inorg.Biochem., 150:81-89, 2015

PubMed Abstract: The bacteriohemerythrin (McHr) from Methylococcus capsulatus (Bath) is an oxygen carrier that serves as a transporter to deliver O2 from the cytosol of the bacterial cell body to the particulate methane monooxygenase residing in the intracytoplasmic membranes for methane oxidation. Here we report X-ray protein crystal structures of the recombinant wild type (WT) McHr and its L114A, L114Y and L114F mutants. The structure of the WT reveals a possible water tunnel in the McHr that might be linked to its faster autoxidation relative to hemerythrin in marine invertebrates. With Leu114 positioned at the end of this putative water tunnel, the hydrophobic side chain of this residue seems to play a prominent role in controlling the access of the water molecule required for autoxidation. This hypothesis is examined by comparing the autoxidation rates of the WT McHr with those of the L114A, L114Y and L114F mutants. The biochemical data are correlated with structural insights derived from the analysis of the putative water tunnels in the various McHr proteins provided by the X-ray structures.

PubMed: 25890483
DOI: 10.1016/j.jinorgbio.2015.04.001

Experimental method

X-RAY DIFFRACTION (1.4 Å)