1JBQ

STRUCTURE OF HUMAN CYSTATHIONINE BETA-SYNTHASE: A UNIQUE PYRIDOXAL 5'-PHOSPHATE DEPENDENT HEMEPROTEIN

PDB DOI: https://doi.org/10.2210/pdb1JBQ/pdb

Classification: LYASE
Organism(s): Homo sapiens
Expression System: Escherichia coli
Mutation(s): No

Deposited: 2001-06-06 Released: 2001-08-12
Deposition Author(s): Meier, M., Janosik, M., Kery, V., Kraus, J.P., Burkhard, P.

Experimental Data Snapshot

Method: X-RAY DIFFRACTION
Resolution: 2.60 Å
R-Value Free: 0.296
R-Value Work: 0.257
R-Value Observed: 0.257

Starting Model: experimental
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wwPDB Validation 3D Report Full Report

Ligand Structure Quality Assessment

This is version 1.3 of the entry. See complete history.

Literature

Structure of human cystathionine beta-synthase: a unique pyridoxal 5'-phosphate-dependent heme protein.

Meier, M., Janosik, M., Kery, V., Kraus, J.P., Burkhard, P.

(2001) EMBO J 20: 3910-3916

PubMed: 11483494 Search on PubMedSearch on PubMed Central
DOI: https://doi.org/10.1093/emboj/20.15.3910
Primary Citation of Related Structures:
1JBQ

PubMed Abstract:
Cystathionine beta-synthase (CBS) is a unique heme- containing enzyme that catalyzes a pyridoxal 5'-phosphate (PLP)-dependent condensation of serine and homocysteine to give cystathionine. Deficiency of CBS leads to homocystinuria, an inherited disease of sulfur metabolism characterized by increased levels of the toxic metabolite homocysteine. Here we present the X-ray crystal structure of a truncated form of the enzyme. CBS shares the same fold with O-acetylserine sulfhydrylase but it contains an additional N-terminal heme binding site. This heme binding motif together with a spatially adjacent oxidoreductase active site motif could explain the regulation of its enzyme activity by redox changes.

Organizational Affiliation

M.E.Müller Institute for Structural Biology, Biozentrum, University of Basel, Klingelbergstrasse 70, CH-4056 Basel, Switzerland.

Macromolecule Content

Total Structure Weight: 290.3 kDa
Atom Count: 16,522
Modelled Residue Count: 2,090
Deposited Residue Count: 2,610
Unique protein chains: 1

Macromolecules

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(by identity cutoff) | 3D Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
CYSTATHIONINE BETA-SYNTHASE	A, B, C, D, E A, B, C, D, E, F	435	Homo sapiens	Mutation(s): 0 EC: 4.2.1.22
UniProt & NIH Common Fund Data Resources
Find proteins for P35520 (Homo sapiens) Explore P35520 Go to UniProtKB: P35520
PHAROS: P35520 GTEx: ENSG00000160200
Entity Groups
Sequence Clusters	30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt Group	P35520
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 G [auth A] SDF format, chain I [auth B] SDF format, chain K [auth C] SDF format, chain M [auth D] SDF format, chain O [auth E] SDF format, chain Q [auth F] MOL2 format, chain G [auth A] MOL2 format, chain I [auth B] MOL2 format, chain K [auth C] MOL2 format, chain M [auth D] MOL2 format, chain O [auth E] MOL2 format, chain Q [auth F] mmCIF format, chain G [auth A] mmCIF format, chain I [auth B] mmCIF format, chain K [auth C] mmCIF format, chain M [auth D] mmCIF format, chain O [auth E] mmCIF format, chain Q [auth F]	G [auth A] I [auth B] K [auth C] M [auth D] O [auth E] G [auth A], I [auth B], K [auth C], M [auth D], O [auth E], Q [auth F]	PROTOPORPHYRIN IX CONTAINING FE C₃₄ H₃₂ Fe N₄ O₄ KABFMIBPWCXCRK-RGGAHWMASA-L		Interactions Focus chain G [auth A] Focus chain I [auth B] Focus chain K [auth C] Focus chain M [auth D] Focus chain O [auth E] Focus chain Q [auth F] Interactions & Density Focus chain G [auth A] Focus chain I [auth B] Focus chain K [auth C] Focus chain M [auth D] Focus chain O [auth E] Focus chain Q [auth F]
PLP Query on PLP Download Ideal Coordinates CCD File SDF format, chain H [auth A] SDF format, chain L [auth C] SDF format, chain N [auth D] SDF format, chain R [auth F] SDF format, chain J [auth B] SDF format, chain P [auth E] MOL2 format, chain H [auth A] MOL2 format, chain L [auth C] MOL2 format, chain N [auth D] MOL2 format, chain R [auth F] MOL2 format, chain J [auth B] MOL2 format, chain P [auth E] mmCIF format, chain H [auth A] mmCIF format, chain L [auth C] mmCIF format, chain N [auth D] mmCIF format, chain R [auth F] mmCIF format, chain J [auth B] mmCIF format, chain P [auth E]	H [auth A] J [auth B] L [auth C] N [auth D] P [auth E] H [auth A], J [auth B], L [auth C], N [auth D], P [auth E], R [auth F]	PYRIDOXAL-5'-PHOSPHATE C₈ H₁₀ N O₆ P NGVDGCNFYWLIFO-UHFFFAOYSA-N		Interactions Focus chain H [auth A] Focus chain J [auth B] Focus chain L [auth C] Focus chain N [auth D] Focus chain P [auth E] Focus chain R [auth F] Interactions & Density Focus chain H [auth A] Focus chain J [auth B] Focus chain L [auth C] Focus chain N [auth D] Focus chain P [auth E] Focus chain R [auth F]

Experimental Data & Validation

Experimental Data

Method: X-RAY DIFFRACTION
Resolution: 2.60 Å
R-Value Free: 0.296
R-Value Work: 0.257
R-Value Observed: 0.257
Space Group: P 3₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 144.52	α = 90
b = 144.52	β = 90
c = 108.16	γ = 120

Software Package:

Software Name	Purpose
DENZO	data reduction
SCALEPACK	data scaling
AMoRE	phasing
CNS	refinement

Structure Validation

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Ligand Structure Quality Assessment

Entry History

Deposition Data

Released Date: 2001-08-12

Deposition Author(s):

Revision History (Full details and data files)

Version 1.0: 2001-08-12
Type: Initial release
Version 1.1: 2008-04-27
Changes: Version format compliance
Version 1.2: 2011-07-13
Changes: Non-polymer description, Version format compliance
Version 1.3: 2023-08-16
Changes: Data collection, Database references, Derived calculations, Refinement description