H zone

A relatively pale zone traversing the center of the A band of a sarcomere, visible in relaxed muscle fibers; consists of the central portion of thick (myosin) filaments that are not overlapped by thin (actin) filaments.

ilicicolin H biosynthetic process

The chemical reactions and pathways resulting in the formation of ilicicolin H, a 4-hydroxy-2-pyridone alkaloid that has potent and broad antifungal activities by inhibiting the mitochondrial respiration chain.

obsolete cathepsin H activity

OBSOLETE. Catalysis of the hydrolysis of peptide bonds, acting as an aminopeptidase (notably, cleaving Arg-Xaa bonds) as well as an endopeptidase.

obsolete NAD(P)H dehydrogenase

OBSOLETE. (Was not defined before being made obsolete).

H-NS complex

A multimer of H-NS proteins that is involved in bacterial nucleoid condensation and negative regulation of global gene expression by directly binding to promoter regions. Recognizes both structural and sequence-specific motifs in double-stranded DNA and has binding preference for bent DNA.

obsolete complement factor H activity

OBSOLETE. A cofactor for the serine protease complement factor I.

exoribonuclease H activity

Catalysis of the exonucleolytic cleavage of RNA to 5'-phosphomonoester oligonucleotides in both 5' to 3' and 3' to 5' directions.

RNA-DNA hybrid ribonuclease activity

Catalysis of the endonucleolytic cleavage of RNA in RNA-DNA hybrids to 5'-phosphomonoesters.

box H/ACA snoRNP complex

A box H/ACA small nucleolar ribonucleoprotein complex located in the nucleolus that catalyzes pseudouridylation of ribosomal RNA residues. The complex is composed of four different core proteins that assemble onto a H/ACA guide RNA scaffold that identifies specific uridines in rRNA for modification during ribosome synthesis.

obsolete box H + ACA snoRNP protein

OBSOLETE. (Was not defined before being made obsolete).