9DJK: T4 Lysozyme D127H/V131H

T4 Lysozyme D127H/V131H. Determined by X-ray diffraction at 1.04 Å resolution. Released 18 Feb 2026.

Method: X-ray diffraction
Resolution: 1.04 Å
Organism: Tequatrovirus T4
Chains: 1
Atoms: 1,686
Mol. weight: 19.52 kDa
Ligands: PO4, HEZ
Released: 18 Feb 2026

Explore 9DJK in 3D Show helices and sheets RCSB PDB PDBe

Secondary structure: helices and β-sheets

9DJK contains 10 α-helices and 6 β-strands across 1 chain. Residue ranges use author residue numbering, as in the PDB file, from PDBe. To see them in 3D, choose the Cartoon representation with Secondary structure coloring: helices, sheets and coils get different colors.

Chain A: 10 helices, 6 β-strands

Element	Residues	Length	Sheet
α-helix	3-11	9
β-strand	14-15	2	1
β-strand	16	1	2
β-strand	17-19	3	1
β-strand	25-28	4	1
β-strand	31-32	2	1
α-helix	39-50	12
β-strand	57	1	2
α-helix	60-79	20
α-helix	84-90	7
α-helix	93-106	14
α-helix	108-112	5
α-helix	115-122	8
α-helix	126-133	8
α-helix	137-141	5
α-helix	143-155	13

Molecules and chains

Molecule	Chains	Type	Length	Organism	UniProt
Endolysin	A	protein	164	Tequatrovirus T4	D9IEF7

Sequence of entity 1 (A), FASTA

>9DJK_1 Endolysin (chains A)
MNIFEMLRIDEGLRLKIYKDTEGYYTIGIGHLLTKSPSLNAAKSELDKAIGRNTNGVITK
DEAEKLFNQDVDAAVRGILRNAKLKPVYDSLDAVRRAALINMVFQMGETGVAGFTNSLRM
LQQKRWHEAAHNLAKSRWYNQTPNRAKRVITTFRTGTWDAYKNL

Ligands and cofactors

ID	Name	Formula	Copies
PO4	Phosphate ion	O4 P	1
HEZ	Hexane-1,6-diol	C6 H14 O2	5

Water and common crystallization additives (CL, K) are not listed.

Primary citation

Structural characterization of the Cu(II)-NTA spin label on alpha-helices by X-ray crystallography and electron paramagnetic resonance. Besaw, J.E., Reichenwallner, J., Chen, E.Y. et al. Structure (2026) 34:645. DOI 10.1016/j.str.2026.01.010 · PubMed

Other PDB entries of the same protein (UniProt D9IEF7), best resolution first:

7LOG 0.99 Å, T4 lysozyme mutant L99A in complex with 3-butylpyridine
7XE7 1.05 Å, T4 lysozyme mutant-S44C/C54T/N68C/A93C/C97A/T115C, pH10
7LXA 1.07 Å, T4 lysozyme mutant L99A
9DJM 1.08 Å, T4 Lysozyme K147H/T151H
7XE6 1.1 Å, T4 lysozyme mutant-S44C/C54T/N68C/A93C/C97A/T115C, pH7
7XEA 1.1 Å, T4 lysozyme mutant-S44C/C54T/N68C/A93C/C97A/T115C, DMSO 40%, and then backsoaking
9DJI 1.1 Å, T4 Lysozyme R119H/Q123H
9DJD 1.11 Å, T4 Lysozyme A73H/G77H/Y139F co-crystallized with Cu(II)-NTA
8F11 1.12 Å, T4 lysozyme with a 2,6-diazaadamantane nitroxide (DZD) spin label
9DJB 1.13 Å, T4 Lysozyme A73H/G77H
9DJC 1.13 Å, T4 Lysozyme A73H/G77H/Y139F
9DJP 1.17 Å, T4 Lysozyme A73H/G77H/R119H/Q123H co-crystallized with Cu(II)-NTA

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