Dehydrogenase/reductase (SDR family) member 7B is an

enzyme Enzymes () are proteins that act as biological catalysts by accelerating chemical reactions. The molecules upon which enzymes may act are called substrates, and the enzyme converts the substrates into different molecules known as products ...

encoded by the DHRS7B

gene In biology, the word gene (from , ; "... Wilhelm Johannsen coined the word gene to describe the Mendelian units of heredity..." meaning ''generation'' or ''birth'' or ''gender'') can have several different meanings. The Mendelian gene is a b ...

in humans, found on

chromosome 17 Chromosome 17 is one of the 23 pairs of chromosomes in humans. People normally have two copies of this chromosome. Chromosome 17 spans more than 83 million base pairs (the building material of DNA) and represents between 2.5 and 3% of the total D ...

p11.2. DHRS7B encodes a protein that is predicted to function in

steroid hormone A steroid hormone is a steroid that acts as a hormone. Steroid hormones can be grouped into two classes: corticosteroids (typically made in the adrenal cortex, hence ''cortico-'') and sex steroids (typically made in the gonads or placenta). Withi ...

regulation. A deletion in the chromosomal region 17p11.2 has been associated with Smith-Magenis Syndrome, a genetic developmental disorder.

Gene

Overview

The DHRS7B gene is located on the positive strand of chromosome 17, beginning at position 21030258 and ending at position 21094836 (64579 bp). DHRS7B contains seven exons with no predicted alternate

splice form Alternative splicing, or alternative RNA splicing, or differential splicing, is an alternative splicing process during gene expression that allows a single gene to code for multiple proteins. In this process, particular exons of a gene may be in ...

s, resulting in an 1841 bp

mRNA In molecular biology, messenger ribonucleic acid (mRNA) is a single-stranded molecule of RNA that corresponds to the genetic sequence of a gene, and is read by a ribosome in the process of synthesizing a protein. mRNA is created during the ...

product. Upstream of DHRS7B on the negative strand of chromosome 17p11.2 are the genes ''Coiled-coil domain containing 144 family, N-terminal-like'' ( CCDC144NL) and ''Ubiquitin specific peptidase 22'' ( USP22). Downstream of DHSRS7B on the negative strand of chromosome 17p11.2 is the gene ''Transmembrane protein 11'' ( TMEM11), and on the positive strand is the gene ''Mitogen-activated protein kinase, kinase 3'' ( MAP2K3).

Gene expression

Microarray and EST data indicates that the DHRS7B gene is highly expressed in the testes, thyroid, kidneys, and adipose tissues. There is moderate expression in the brain, pancreas, mammary glands, and ovaries. Finally, there is little expression in spleen, thymus, tonsils, bone marrow, and bladder.

Protein structure

The DHRS7B gene has a predicted protein product that is 325 amino acids, a

molecular weight A molecule is a group of two or more atoms held together by attractive forces known as chemical bonds; depending on context, the term may or may not include ions which satisfy this criterion. In quantum physics, organic chemistry, and bioch ...

of 35.1 kDa, and an

isoelectric point The isoelectric point (pI, pH(I), IEP), is the pH at which a molecule carries no net electrical charge or is electrically neutral in the statistical mean. The standard nomenclature to represent the isoelectric point is pH(I). However, pI is also u ...

of 9.867. There is one predicted

transmembrane A transmembrane protein (TP) is a type of integral membrane protein that spans the entirety of the cell membrane. Many transmembrane proteins function as gateways to permit the transport of specific substances across the membrane. They frequent ...

domain in the protein sequence, a large neutrally charged region spanning residues 18-38. No

signal peptides A signal peptide (sometimes referred to as signal sequence, targeting signal, localization signal, localization sequence, transit peptide, leader sequence or leader peptide) is a short peptide (usually 16-30 amino acids long) present at the N-te ...

have been identified in DHRS7B; cellular localization remains unclear. DHRS7B is a member of the short chain dehydrogenase/reductase (SDR) superfamily and possesses characteristic features of an SDR within the protein sequence. The following table identifies sequences in the protein and corresponding function. BIOI Protein Representation

Interactions

In humans, DHRS7B has been shown to physically interact with other proteins such as ''Mediator complex subunit 19'' ( MED19) and ''Brain and reproductive expressed-modulator protein'' (

BRE British English (BrE, en-GB, or BE) is, according to Oxford Dictionaries, "English as used in Great Britain, as distinct from that used elsewhere". More narrowly, it can refer specifically to the English language in England, or, more broadly, ...

). MED19 was found to interact with DHRS7B through a two hybrid screening approach and plays a role as a co-activator in regulated transcription of most RNA polymerase II dependent genes. BRE is a component of the BRCA1-A complex, which recognizes Lys-63 linked

ubiquitinated Ubiquitin is a small (8.6 kDa) regulatory protein found in most tissues of eukaryotic organisms, i.e., it is found ''ubiquitously''. It was discovered in 1975 by Gideon Goldstein and further characterized throughout the late 1970s and 1980s. Fou ...

histones In biology, histones are highly basic proteins abundant in lysine and arginine residues that are found in eukaryotic cell nuclei. They act as spools around which DNA winds to create structural units called nucleosomes. Nucleosomes in turn ar ...

H2A and H2AX DNA lesion sites (identified using anti-tag coimmunoprecipitation). Other proteins interacting with DHRS7B have only been identified through

text mining Text mining, also referred to as ''text data mining'', similar to text analytics, is the process of deriving high-quality information from text. It involves "the discovery by computer of new, previously unknown information, by automatically extract ...

Homology

Orthologs

Conservation of the DHRS7B protein sequence has been observed highly in

mammals Mammals () are a group of vertebrate animals constituting the class Mammalia (), characterized by the presence of mammary glands which in females produce milk for feeding (nursing) their young, a neocortex (a region of the brain), fur o ...

; moderately in reptiles, birds,

fish Fish are aquatic, craniate, gill-bearing animals that lack limbs with digits. Included in this definition are the living hagfish, lampreys, and cartilaginous and bony fish as well as various extinct related groups. Approximately 95% of ...

and amphibians; minimally in

invertebrates Invertebrates are a paraphyletic group of animals that neither possess nor develop a vertebral column (commonly known as a ''backbone'' or ''spine''), derived from the notochord. This is a grouping including all animals apart from the chordat ...

insects Insects (from Latin ') are pancrustacean hexapod invertebrates of the class Insecta. They are the largest group within the arthropod phylum. Insects have a chitinous exoskeleton, a three-part body (head, thorax and abdomen), three pairs of j ...

, and

fungi A fungus ( : fungi or funguses) is any member of the group of eukaryotic organisms that includes microorganisms such as yeasts and molds, as well as the more familiar mushrooms. These organisms are classified as a kingdom, separately from ...

Paralogs

Paralogs Sequence homology is the biological homology between DNA, RNA, or protein sequences, defined in terms of shared ancestry in the evolutionary history of life. Two segments of DNA can have shared ancestry because of three phenomena: either a sp ...

of DHRS7B are all in the SDR superfamily and conservation of the SDR functional motifs was identified in a

multiple sequence alignment Multiple sequence alignment (MSA) may refer to the process or the result of sequence alignment of three or more biological sequences, generally protein, DNA, or RNA. In many cases, the input set of query sequences are assumed to have an evolutio ...

Clinical significance

DHRS7B has been identified in the Smith-Magenis Syndrome region, where a deletion in this chromosomal region (17p11.2) causes a genetic developmental disorder. In breast cancer cells expressing

CD44 The CD44 antigen is a cell-surface glycoprotein involved in cell–cell interactions, cell adhesion and migration. In humans, the CD44 antigen is encoded by the ''CD44'' gene on chromosome 11. CD44 has been referred to as HCAM (homing cell adhes ...

and CD24, DHRS7B expression was observed to be down regulated. CD44 is an antigen found on the surface of most cell types and functions as a receptor that binds tissue macromolecules. Additionally, it acts as an adhesion molecule for

leukocytes White blood cells, also called leukocytes or leucocytes, are the cells of the immune system that are involved in protecting the body against both infectious disease and foreign invaders. All white blood cells are produced and derived from mult ...

on peripheral lymphoid organs and inflammation sites. CD24 is associated with B-cells,

epithelial cells Epithelium or epithelial tissue is one of the four basic types of animal tissue, along with connective tissue, muscle tissue and nervous tissue. It is a thin, continuous, protective layer of compactly packed cells with a little intercell ...

, and

dendritic cells Dendritic cells (DCs) are antigen-presenting cells (also known as ''accessory cells'') of the mammalian immune system. Their main function is to process antigen material and present it on the cell surface to the T cells of the immune system. The ...

, functioning as an adhesion molecule and shown to enhance a tumor cell's capability of metastasizing.

References

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