NMR paper An NMR and circular dichroism study of the interaction of thiocyanate with human and

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[NMR paper] An NMR and circular dichroism study of the interaction of thiocyanate with human and

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NMR processing:

MDD

NMR assignment:

Backbone:

Side-chains:

NOEs:

Structure from NMR restraints:

Ab initio:

Fragment-based:

Rosetta-NMR (Robetta)

Template-based:

GeNMR

I-TASSER

Refinement:

Amber

Structure from chemical shifts:

Fragment-based:

Homology-based:

Torsion angles from chemical shifts:

Preditor

TALOS

Promega- Proline

Secondary structure from chemical shifts:

CSI (via RCI server)

TALOS

MICS caps, β-turns

d2D

PECAN

Flexibility from chemical shifts:

RCI

Interactions from chemical shifts:

HADDOCK

Chemical shifts re-referencing:

NMR model quality:

NOEs, other restraints:

Chemical shifts:

RDCs:

Pseudocontact shifts:

Protein geomtery:

SAVES2 or SAVES4

Quality Control Check

NMR spectrum prediction:

FANDAS

MestReS

V-NMR

Flexibility from structure:

Backbone S2

Methyl S2

B-factor

Molecular dynamics:

Gromacs

Amber

Antechamber

Chemical shifts prediction:

From structure:

Shiftx2

Sparta+

Camshift

CH3shift- Methyl

ArShift- Aromatic

ShiftS

Proshift

PPM

CheShift-2- Cα

From sequence:

Shifty

Camcoil

Poulsen_rc_CS

Disordered proteins:

MAXOCC

Format conversion & validation:

CCPN

From NMR-STAR 3.1

Validate NMR-STAR 3.1

NMR sample preparation:

Protein disorder:

DisMeta

Protein solubility:

Isotope labeling:

Solid-state NMR:

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11-24-2010, 09:16 PM

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An NMR and circular dichroism study of the interaction of thiocyanate with human and

An NMR and circular dichroism study of the interaction of thiocyanate with human and cross-linked hemoglobin: identification of Lys-alpha-99 as a possible dissociation linked binding site.

Related Articles An NMR and circular dichroism study of the interaction of thiocyanate with human and cross-linked hemoglobin: identification of Lys-alpha-99 as a possible dissociation linked binding site.

Biophys Chem. 2003 Dec 1;106(3):233-40

Authors: Sau AK, Currell D, Mazumdar S, Mitra S

The interaction of thiocyanate with human native and cross-linked oxyhemoglobin (oxyHb), and methemoglobin (metHb) has been investigated by optical spectroscopy, circular dichroism (CD) and nuclear spin lattice relaxation rate measurements. The interaction of thiocyanate anion with human hemoglobin has been investigated by NMR measurements of the nuclear spin lattice relaxation rate of N(15) labeled thiocyanate in the presence of cyanomethemoglobin and cross-linked cyanomethemoglobin. Results show that thiocyanate is located approximately 8.9 and 6.2 A away from the heme group in cyanomethemoglobin and cross-linked cyanomethemoblobin, respectively. These results are consistent with the binding of SCN(-) at the lys-alpha-99 in the unmodified hemoglobin. Since this site is blocked in the cross-linked hemoglobin, the binding site is different. Results show that one mole of SCN(-) is binding to one mole of oxyhemoglobin suggesting that binding at the lys-alpha-99 is linked to dissociation of the hemoglobin tetramer into dimers due to its location at the alpha(1)beta(2) interface. Circular dichroism studies show that the interaction of thiocyanate with oxyHb decreases the optical rotation at 240 nm indicating a conformational change of the protein, which influences the electronic transitions of a number of peptide bonds or (and) a few aromatic side chains.

PMID: 14556895 [PubMed - indexed for MEDLINE]

Source: PubMed

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