RNA-binding protein involved in the histone pre-mRNA processing (PubMed:18036581). Binds the stem-loop structure of replication-dependent histone pre-mRNAs and contributes to efficient 3'-end processing by stabilizing the complex between histone pre-mRNA and U7 small nuclear ribonucleoprotein (snRNP), via the histone downstream element (HDE) (PubMed:18036581). Plays an important role in targeting mature histone mRNA from the nucleus to the cytoplasm and to the translation machinery (By similarity). Stabilizes mature histone mRNA and could be involved in cell-cycle regulation of histone gene expression (By similarity). Involved in the mechanism by which growing oocytes accumulate histone proteins that support early embryogenesis (PubMed:18036581). Binds to the 5' side of the stem-loop structure of histone pre-mRNAs (PubMed:19470752). Monomer. SLBP/pre-mRNA complex interacts with ZNF473 (By similarity). Interacts with the Importin alpha/Importin beta receptor, LSM1, MIF4GD, TNPO3 and UPF1 (By similarity). Interaction with LSM1 occurs when histone mRNA is being rapidly degraded during the S phase (By similarity). Found in a ternary complex with ERI1 and the stem-loop structure of the 3' end of histone mRNA. Associates with polyribosomes (By similarity). Identified in a histone pre-mRNA complex, at least composed of ERI1, LSM11, SLBP, SNRPB, SYNCRIP and YBX1 (PubMed:19470752). Binds in a cooperative manner with ERI1 to the mature 3'-end of histone mRNAs (PubMed:19470752). Localizes predominantly in the nucleus at the G1/G2 phases and the beginning of S phase. Through the S phase, partially redistributes to the cytoplasm. Binding to histone mRNA is necessary for cytoplasmic localization. Shuttles between the nucleus and the cytoplasm. Imported in the nucleus by the Importin alpha/Importin beta receptor (By similarity). Polyribosome-associated. Widely expressed. Expressed in growing primary but not non-growing oocytes, within the primordial follicles. Also detected in fully-grown oocytes in antral follicles (at protein level). Amino acids 31-34, 96-99 and 246-249 are necessary for interaction with the Importin alpha/Importin beta receptor. The first 18 amino acids, amino acids 69-76 and 179-182 are necessary for interaction with TNPO3. Amino acids 31-34, 96-99 and 246-249 are necessary for nuclear localization (By similarity). Phosphorylated on Thr-61 and Thr-62 in the S-phase. Phosphorylation of Thr-62 by CDK1 primes phosphorylation of Thr-61 by CK2. Phosphorylation of Thr-62 is required for its degradation at the end of the S phase. Its degradation is not required for histone mRNA degradation at the end of the S phase. All the phosphorylated forms detected are present in the cytoplasm. Both unphosphorylated and phosphorylated forms bind the stem-loop structure of histone mRNAs. Phosphorylation at Thr-171 increases affinity for histone mRNAs (By similarity). Ubiquitinated by the CRL2(FEM1A), CRL2(FEM1B) and CRL2(FEM1C) complexes, leading to its degradation. Females show no impaired oogenesis but display a defect in the formation of primordial follicles leading to infertility. Most embryos arrested at the 2-cell stage and fail to complete the second round of DNA replication due to an insufficient supply of histone H3 and H4. Accumulation of histone H2A and H2B is not affected. Belongs to the SLBP family.