Macro domain

Last updated
Macro
PDB 1zr3 EBI.jpg
Crystal structure of the macro-domain of human core histone variant macroh2a1.1
Identifiers
SymbolMacro
Pfam PF01661
Pfam clan CL0223
InterPro IPR002589
SCOP2 1vhu / SCOPe / SUPFAM
CDD cd02749
Available protein structures:
Pfam   structures / ECOD  
PDB RCSB PDB; PDBe; PDBj
PDBsum structure summary

In molecular biology, the Macro domain (often also written macrodomain) or A1pp domain is an ancient, evolutionary conserved structural module found in all kingdoms of life as well as some viruses. [1] Macro domains are modules of about 180 amino acids that can bind ADP-ribose, an NAD metabolite, or related ligands. Binding to ADP-ribose can be either covalent or non-covalent: [2] in certain cases it is believed to bind non-covalently, [3] while in other cases (such as Aprataxin) it appears to bind both non-covalently through a zinc finger motif, and covalently through a separate region of the protein. [4]

Contents

Function

The domain was described originally in association with the ADP-ribose 1-phosphate (Appr-1-P)-processing activity (A1pp) of the yeast YBR022W protein and called A1pp. [5] However, the domain has been renamed Macro as it is the C-terminal domain of mammalian core histone macro-H2A. [6] [7] Macro domain proteins can be found in eukaryotes, in (mostly pathogenic) bacteria, in archaea and in ssRNA viruses, such as coronaviruses, Rubella and Hepatitis E viruses. In vertebrates the domain occurs in e.g. histone macroH2A, predicted poly-ADP-ribose polymerases (PARPs) and B aggressive lymphoma (BAL) protein. Zinc-containing macro domains (Zn-Macros) are primarily encountered in pathogenic microorganisms and have structurally distinct features from other macro domains, which include their function being strictly dependent on a catalytic zinc within the active site. [8] [9]

ADP-ribosylation of proteins is an important post-translational modification that occurs in a variety of biological processes, including DNA repair, regulation of transcription, chromatin biology, maintenance of genomic stability, telomere dynamics, [10] cell differentiation and proliferation, [11] necrosis and apoptosis, [12] and long-term memory formation. [13] The Macro domain recognises the ADP-ribose nucleotide and in some cases poly-ADP-ribose, and is thus a high-affinity ADP-ribose-binding module found in a number of otherwise unrelated proteins. [14]

ADP-ribosylation of DNA is relatively uncommon and has only been described for a small number of toxins that include pierisin, [15] scabin [16] and DarT. [17] [18] The Macro domain from the antitoxin DarG of the toxin-antitoxin system DarTG, both binds and removes the ADP-ribose modification added to DNA by the toxin DarT. [17] [18] The Macro domain from human, macroH2A1.1, binds an NAD metabolite O-acetyl-ADP-ribose. [19]

ClassSubclassSpeciesActivity
MacroH2A-likeeADP-ribose binding
MacroD-type‘classic’a, b, e, vADP-ribosyl bond hydrolysis
Zn-dependentb, eADP-ribosyl bond hydrolysis
GDAP2-likeeADP-ribose binding
ALC1-likeb, eADP-ribose binding or ADP-ribosyl bond hydrolysis
PARG-likePARG_cateADP-ribosyl bond hydrolysis
mPARG (DUF2263)b, e, vADP-ribosyl bond hydrolysis
Macro2-typee, vADP-ribosyl bond hydrolysis
SUD-M-likevRNA binding
DUF2362eunknown
a, Archaea; b, Bacteria; e, Eukarya; v, Virus

Structure

The 3D structure of the Macro domain describes a mixed alpha/beta fold of a mixed beta sheet sandwiched between four helices with the ligand-binding pocket lies within the fold. [14] Several Macro domain-only domains are shorter than the structure of AF1521 and lack either the first strand or the C-terminal helix 5. Well conserved residues form a hydrophobic cleft and cluster around the AF1521-ADP-ribose binding site. [7] [14] [19] [20]

See also

Related Research Articles

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<span class="mw-page-title-main">Nucleosome</span> Basic structural unit of DNA packaging in eukaryotes

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<span class="mw-page-title-main">ADP-ribosylation</span> Addition of one or more ADP-ribose moieties to a protein.

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<span class="mw-page-title-main">ADP-ribosylhydrolase</span>

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<span class="mw-page-title-main">PARG</span> Protein-coding gene in the species Homo sapiens

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<span class="mw-page-title-main">ADP-ribosylhydrolase 1</span>

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References

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This article incorporates text from the public domain Pfam and InterPro: IPR002589