Mediates the post-translational oxidative deamination of lysine residues on target proteins leading to the formation of deaminated lysine (allysine). Acts as a transcription corepressor and specifically mediates deamination of trimethylated 'Lys-4' of histone H3 (H3K4me3), a specific tag for epigenetic transcriptional activation. Shows no activity against histone H3 when it is trimethylated on 'Lys-9' (H3K9me3) or 'Lys-27' (H3K27me3) or when 'Lys-4' is monomethylated (H3K4me1) or dimethylated (H3K4me2). Also mediates deamination of methylated TAF10, a member of the transcription factor IID (TFIID) complex, which induces release of TAF10 from promoters, leading to inhibition of TFIID-dependent transcription. LOXL2-mediated deamination of TAF10 results in transcriptional repression of genes required for embryonic stem cell pluripotency including POU5F1/OCT4, NANOG, KLF4 and SOX2. Involved in epithelial to mesenchymal transition (EMT) via interaction with SNAI1 and participates in repression of E-cadherin CDH1, probably by mediating deamination of histone H3. During EMT, involved with SNAI1 in negatively regulating pericentromeric heterochromatin transcription. SNAI1 recruits LOXL2 to pericentromeric regions to oxidize histone H3 and repress transcription which leads to release of heterochromatin component CBX5/HP1A, enabling chromatin reorganization and acquisition of mesenchymal traits. Interacts with the endoplasmic reticulum protein HSPA5 which activates the IRE1-XBP1 pathway of the unfolded protein response, leading to expression of several transcription factors involved in EMT and subsequent EMT induction. When secreted into the extracellular matrix, promotes cross-linking of extracellular matrix proteins by mediating oxidative deamination of peptidyl lysine residues in precursors to fibrous collagen and elastin. Acts as a regulator of sprouting angiogenesis, probably via collagen IV scaffolding. Acts as a regulator of chondrocyte differentiation, probably by regulating expression of factors that control chondrocyte differentiation. H2O + L-lysyl-[protein] + O2 = (S)-2-amino-6-oxohexanoyl-[protein] + H2O2 + NH4(+) Contains 1 lysine tyrosylquinone. Specifically inhibited by a mouse monoclonal antibody AB0023, inhibition occurs in a non-competitive manner. Component of some chromatin repressor complex. Interacts with SNAI1. Interacts with TAF10. Interacts with HSPA5. Interacts with EFEMP2 (By similarity). Associated with chromatin. It is unclear how LOXL2 is nuclear as it contains a signal sequence and has been shown to be secreted. However, a number of reports confirm its intracellular location and its key role in transcription regulation. The fourth SRCR domain plays an important role in optimizing the catalytic activity of the lysyl-oxidase like (LOX) catalytic domain. The lysine tyrosylquinone cross-link (LTQ) is generated by condensation of the epsilon-amino group of a lysine with a topaquinone produced by oxidation of tyrosine. N-glycosylated. N-glycosylation on Asn-455 and Asn-644 may be essential for proper folding and secretion; may be composed of a fucosylated carbohydrates attached to a trimannose N-linked glycan core. Belongs to the lysyl oxidase family.