4R8M

Human SIRT2 crystal structure in complex with BHJH-TM1

Summary for 4R8M

• Entry DOI: 10.2210/pdb4r8m/pdb
• Related: 3PKJ 3ZGO 3ZGV 4L3O
• Descriptor: NAD-dependent protein deacetylase sirtuin-2, BHJH-TM1 peptide, ZINC ION, ... (5 entities in total)
• Functional Keywords: rossmann fold, nad-dependent protein deacetylase, hydrolase-hydrolase inhibitor complex, hydrolase/hydrolase inhibitor
• Biological source: Homo sapiens (human); More
• Cellular location: Nucleus. Isoform 1: Cytoplasm . Isoform 2: Cytoplasm . Isoform 5: Cytoplasm : Q8IXJ6
• Total number of polymer chains: 4
• Total formula weight: 73942.36

Authors

Teng, Y.B.,Hao, Q.,Lin, H.N.,Jing, H. (deposition date: 2014-09-02, release date: 2015-03-11, Last modification date: 2024-10-16)

Primary citation

Teng, Y.B.,Jing, H.,Aramsangtienchai, P.,He, B.,Khan, S.,Hu, J.,Lin, H.,Hao, Q.
Efficient Demyristoylase Activity of SIRT2 Revealed by Kinetic and Structural Studies
Sci Rep, 5:8529-8529, 2015

PubMed Abstract: Sirtuins are a class of enzymes originally identified as nicotinamide adenine dinucleotide (NAD)-dependent protein lysine deacetylases. Among the seven mammalian sirtuins, SIRT1-7, only SIRT1-3 possess efficient deacetylase activity in vitro, whereas SIRT4-7 possess very weak in vitro deacetylase activity. Several sirtuins that exhibit weak deacetylase activity have recently been shown to possess more efficient activity for the removal other acyl lysine modifications, such as succinyl lysine and palmitoyl lysine. Here, we demonstrate that even the well-known deacetylase SIRT2 possesses efficient activity for the removal of long-chain fatty acyl groups. The catalytic efficiency (kcat/Km) for the removal of a myristoyl group is slightly higher than that for the removal of an acetyl group. The crystal structure of SIRT2 in complex with a thiomyristoyl peptide reveals that SIRT2 possesses a large hydrophobic pocket that can accommodate the myristoyl group. Comparison of the SIRT2 acyl pocket to those of SIRT1, SIRT3, and SIRT6 reveals that the acyl pockets of SIRT1-3 are highly similar, and to a lesser degree, similar to that of SIRT6. The efficient in vitro demyristoylase activity of SIRT2 suggests that this activity may be physiologically relevant and warrants future investigative studies.

PubMed: 25704306
DOI: 10.1038/srep08529

Experimental method

X-RAY DIFFRACTION (2.1 Å)