Component of the U7 snRNP complex that is involved in the histone 3'-end pre-mRNA processing (PubMed:12975319, PubMed:15824063). Increases U7 snRNA levels but not histone 3'-end pre-mRNA processing activity, when overexpressed (PubMed:12975319, PubMed:15824063). Required for cell cycle progression from G1 to S phases (PubMed:16914750). Binds specifically to the Sm-binding site of U7 snRNA. Component of the heptameric ring U7 snRNP complex, or U7 Sm protein core complex, at least composed of LSM10, LSM11, SNRPB, SNRPD3, SNRPE, SNRPF, SNRPG and U7 snRNA (PubMed:12975319). Formation of the U7 snRNP is an ATP-dependent process mediated by a specialized SMN complex containing at least the Sm protein core complex and additionally, the U7-specific LSM10 and LSM11 proteins (PubMed:12975319). Identified in a histone pre-mRNA complex, at least composed of ERI1, LSM11, SLBP, SNRPB, SYNCRIP and YBX1 (PubMed:19470752). Interacts (via the Sm domains) with CLNS1A (PubMed:16087681). Interacts with PRMT5, SMN, ZNF473 and WDR77 (PubMed:12975319, PubMed:16087681, PubMed:15824063). The C-terminal SM 1 domain is both necessary for the binding to the Sm-binding site of U7 snRNA and U7 snRNP assembly (PubMed:12975319). The N-terminal domain is essential for histone pre-mRNA cleavage (PubMed:12975319). Amino acids 63-82 are sufficient to interact with ZNF473 (PubMed:12975319). Not methylated. Belongs to the snRNP Sm proteins family.