1BUW

CRYSTAL STRUCTURE OF S-NITROSO-NITROSYL HUMAN HEMOGLOBIN A

PDB DOI: https://doi.org/10.2210/pdb1BUW/pdb

Classification: OXYGEN STORAGE/TRANSPORT
Organism(s): Homo sapiens
Mutation(s): Yes

Deposited: 1998-09-06 Released: 1998-09-16
Deposition Author(s): Chan, N.-L., Rogers, P.H., Arnone, A.

Experimental Data Snapshot

Method: X-RAY DIFFRACTION
Resolution: 1.90 Å
R-Value Free: 0.244
R-Value Work: 0.184
R-Value Observed: 0.184

Starting Model: experimental
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Ligand Structure Quality Assessment

This is version 1.4 of the entry. See complete history.

Literature

Crystal structure of the S-nitroso form of liganded human hemoglobin.

Chan, N.L., Rogers, P.H., Arnone, A.

(1998) Biochemistry 37: 16459-16464

PubMed: 9843411 Search on PubMed
DOI: https://doi.org/10.1021/bi9816711
Primary Citation of Related Structures:
1BUW

PubMed Abstract:
Although numerous reports have documented that the S-nitrosylation of cysteine residues by NO alters the activities of a wide variety of proteins, the direct visualization and the structural consequences of this reversible modification have not yet been reported for any protein. Here we describe the crystal structure of S-nitroso-nitrosylhemoglobin determined at a resolution of 1.8 A. The specific reaction of NO with Cys93beta is confirmed in this structure, and a large S-nitrosylation-induced change in the tertiary structure of the COOH-terminal dipeptides of the beta subunits provides additional insight into the stereochemical mechanism by which blood flow is regulated by the interaction of NO with hemoglobin.

Organizational Affiliation

Department of Biochemistry, College of Medicine, The University of Iowa, Iowa City 52242, USA.

Macromolecule Content

Total Structure Weight: 64.73 kDa
Atom Count: 4,718
Modelled Residue Count: 570
Deposited Residue Count: 574
Unique protein chains: 2

Macromolecules

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(by identity cutoff) | 3D Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
PROTEIN (HEMOGLOBIN)	A, C	141	Homo sapiens	Mutation(s): 0
UniProt & NIH Common Fund Data Resources
Find proteins for P69905 (Homo sapiens) Explore P69905 Go to UniProtKB: P69905
PHAROS: P69905 GTEx: ENSG00000188536 ENSG00000206172
Entity Groups
Sequence Clusters	30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt Group	P69905
Sequence Annotations Expand
Reference Sequence

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(by identity cutoff) | 3D Structure

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
PROTEIN (HEMOGLOBIN)	B, D	146	Homo sapiens	Mutation(s): 1
UniProt & NIH Common Fund Data Resources
Find proteins for P68871 (Homo sapiens) Explore P68871 Go to UniProtKB: P68871
PHAROS: P68871 GTEx: ENSG00000244734
Entity Groups
Sequence Clusters	30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt Group	P68871
Sequence Annotations Expand
Reference Sequence

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram	3D Interactions
HEM Query on HEM Download Ideal Coordinates CCD File SDF format, chain E [auth A] SDF format, chain I [auth C] SDF format, chain K [auth D] SDF format, chain G [auth B] MOL2 format, chain E [auth A] MOL2 format, chain I [auth C] MOL2 format, chain K [auth D] MOL2 format, chain G [auth B] mmCIF format, chain E [auth A] mmCIF format, chain I [auth C] mmCIF format, chain K [auth D] mmCIF format, chain G [auth B]	E [auth A], G [auth B], I [auth C], K [auth D]	PROTOPORPHYRIN IX CONTAINING FE C₃₄ H₃₂ Fe N₄ O₄ KABFMIBPWCXCRK-RGGAHWMASA-L		Interactions Focus chain E [auth A] Focus chain G [auth B] Focus chain I [auth C] Focus chain K [auth D] Interactions & Density Focus chain E [auth A] Focus chain G [auth B] Focus chain I [auth C] Focus chain K [auth D]
NO Query on NO Download Ideal Coordinates CCD File SDF format, chain J [auth C] SDF format, chain L [auth D] SDF format, chain F [auth A] SDF format, chain H [auth B] MOL2 format, chain J [auth C] MOL2 format, chain L [auth D] MOL2 format, chain F [auth A] MOL2 format, chain H [auth B] mmCIF format, chain J [auth C] mmCIF format, chain L [auth D] mmCIF format, chain F [auth A] mmCIF format, chain H [auth B]	F [auth A], H [auth B], J [auth C], L [auth D]	NITRIC OXIDE N O ODUCDPQEXGNKDN-UHFFFAOYSA-N		Interactions Focus chain F [auth A] Focus chain H [auth B] Focus chain J [auth C] Focus chain L [auth D] Interactions & Density Focus chain F [auth A] Focus chain H [auth B] Focus chain J [auth C] Focus chain L [auth D]

Modified Residues 1 Unique
ID	Chains	Type	Formula	2D Diagram	Parent
SNC Query on SNC	B, D	L-PEPTIDE LINKING	C₃ H₆ N₂ O₃ S		CYS

Experimental Data & Validation

Experimental Data

Method: X-RAY DIFFRACTION
Resolution: 1.90 Å
R-Value Free: 0.244
R-Value Work: 0.184
R-Value Observed: 0.184
Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 97.1	α = 90
b = 101.2	β = 90
c = 61.1	γ = 90

Software Package:

Software Name	Purpose
X-PLOR	model building
X-PLOR	refinement
X-PLOR	phasing

Structure Validation

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Ligand Structure Quality Assessment

Entry History

Deposition Data

Released Date: 1998-09-16

Deposition Author(s):

Chan, N.-L.

Rogers, P.H.

Arnone, A.

Revision History (Full details and data files)

Version 1.0: 1998-09-16
Type: Initial release
Version 1.1: 2008-04-27
Changes: Version format compliance
Version 1.2: 2011-07-13
Changes: Version format compliance
Version 1.3: 2023-08-09
Changes: Data collection, Database references, Derived calculations, Refinement description
Version 1.4: 2024-10-30
Changes: Structure summary