1Y7L | pdb_00001y7l

Classification: TRANSFERASE
Organism(s): Haemophilus influenzae, Haemophilus influenzae (strain ATCC 51907 / DSM 11121 / KW20 / Rd)
Expression System: Escherichia coli BL21(DE3)
Mutation(s): Yes

Experimental Data Snapshot

Starting Model: experimental
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wwPDB Validation 3D Report Full Report

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

(2005) J Bacteriol 187: 3201-3205

PubMed Abstract:
The biosynthesis of cysteine in bacteria and plants is carried out by a two-step pathway, catalyzed by serine acetyltransferase (SAT) and O-acetylserine sulfhydrylase (OASS; O-acetylserine [thiol] lyase). The aerobic form of OASS forms a tight bienzyme complex with SAT in vivo, termed cysteine synthase. We have determined the crystal structure of OASS in complex with a C-terminal peptide of SAT required for bienzyme complex formation. The binding site of the peptide is at the active site of OASS, and its C-terminal carboxyl group occupies the same anion binding pocket as the alpha-carboxylate of the O-acetylserine substrate of OASS. These results explain the partial inhibition of OASS by SAT on complex formation as well as the competitive dissociation of the complex by O-acetylserine.

Organizational Affiliation

Department of Biochemistry, Albert Einstein College of Medicine, 1300 Morris Park Ave., Bronx, NY 10461, USA.

Macromolecule Content

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| 3D Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
O-acetylserine sulfhydrylase	A	316	Haemophilus influenzae	Mutation(s): 1 Gene Names: cysk EC: 2.5.1.47
UniProt
Find proteins for P45040 (Haemophilus influenzae (strain ATCC 51907 / DSM 11121 / KW20 / Rd)) Explore P45040 Go to UniProtKB: P45040
Entity Groups
Sequence Clusters	30% Identity 50% Identity 70% Identity 90% Identity 95% Identity 100% Identity
UniProt Group	P45040
Sequence Annotations Expand
Reference Sequence

Find similar proteins by: Sequence | 3D Structure

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
decamer fragment of Serine acetyltransferase	B [auth P]	10	N/A	Mutation(s): 0 EC: 2.3.1.30
UniProt
Find proteins for P43886 (Haemophilus influenzae (strain ATCC 51907 / DSM 11121 / KW20 / Rd)) Explore P43886 Go to UniProtKB: P43886
Entity Groups
Sequence Clusters	30% Identity 50% Identity 70% Identity 90% Identity 95% Identity 100% Identity
UniProt Group	P43886
Sequence Annotations Expand
Reference Sequence

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram	3D Interactions
SO4 Query on SO4 Download:Ideal Coordinates CCD File SDF format, chain C [auth A] MOL2 format, chain C [auth A] mmCIF format, chain C [auth A]	C [auth A]	SULFATE ION O₄ S QAOWNCQODCNURD-UHFFFAOYSA-L		Interactions Focus chain C [auth A] Interactions & Density Focus chain C [auth A]

Modified Residues 1 Unique
ID	Chains	Type	Formula	2D Diagram	Parent
LLP Query on LLP	A	L-PEPTIDE LINKING	C₁₄ H₂₂ N₃ O₇ P		LYS

Space Group: I 4₁

Unit Cell:

Software Package:

Deposition Author(s):

Huang, B.

Version 1.0: 2005-04-26
Type: Initial release
Version 1.1: 2008-04-30
Changes: Version format compliance
Version 1.2: 2011-07-13
Changes: Version format compliance
Version 1.3: 2023-08-23
Changes: Data collection, Database references, Derived calculations, Refinement description
Version 1.4: 2023-11-15
Changes: Data collection